fzhlee/SwiftUI-Guide fzhlee/SwiftUI-Guide

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SwiftUI practices guidebook, written for humans.


English Version >

SwiftUI

更好的应用，更少的代码。

SwiftUI是一种创新、简单的iOS开发中的界面布局方案，可以通过Swift语言的强大功能，在所有的Apple平台上快速构建用户界面。 仅使用一组工具和API为任何Apple设备构建用户界面。
SwiftUI具有易于阅读和自然编写的声明式Swift语法，可与新的Xcode设计工具无缝协作，使您的代码和设计完美同步。
自动支持动态类型、暗黑模式、本地化和可访问性，意味着您的第一行SwiftUI代码已经是您编写过的最强大的UI代码了。


点击查看全部的SwiftUI实例的动画演示

SwiftUI开发实用快捷键
Command + Option + Enter : 打开或关闭预览窗口
Command + Option + P : 刷新预览窗口


SwiftUI的231节教程及源码
所有课程的源码在Xcode 12.1正式版上编译通过。

1184节海量iOS开发课程，手把手学习iOS开发，App Store免费下载：
1、Xcode+SwiftUI互动教程免费下载地址：https://itunes.apple.com/cn/app/id1063100471
2、Swift语言入门实例互动教程免费下载地址：https://itunes.apple.com/cn/app/id1063100471
3、iOS开发中的神兵利器免费下载地址：https://itunes.apple.com/cn/app/id1063100471
4、Objective-C语言应用开发互动教程免费下载地址：https://apps.apple.com/cn/app/id1063100471

课程章节导航区：

第一章 常用的Views

第1节：SwiftUI空白项目的创建步骤：

1、打开Xcode，然后使用菜单命令:File > New > Project命令，打开项目创建窗口。
2、在项目模板选择窗口中，选择Single View App模板，然后点击Next按钮，进入下一步设置窗口。
3、在项目配置窗口中，需要勾选Use SwiftUI复选框，然后填写其它的配置选项，点击Next按钮，完成项目的创建。
4、SwiftUI项目创建完成之后，其项目结构和代码功能如下图所示：

image


5、项目导航区：
文件名称 说明
AppDelegate.swift 提供didFinishLaunchingWithOptions等方法，用来处理程序启动之后的事件，或者响应来自外部的事件。
SceneDelegate.swift 设置应用程序窗口的rootViewController，并指定使用哪个ContentView作为rootViewController的rootView。
ContentView.swift 项目的初始界面，用户界面上的可视控件可以放置在此文件中。
Assets.xcassets 项目的资源文件，您可以在此处放置项目中所需的图片、颜色等资源。
LaunchScreen.storyboard 用来配置项目启动过程中所显示的内容。
Info.plist 项目的配置属性文件，配置产品名称、版本号、Build号、Bundle Identifier等项目。

6、代码编辑器：

  • SwiftUI使用声明性语法，因此开发者可以简单地说明用户界面应该做什么。
  • 例如，您可以编写需要包含文本字段的项目列表，然后描述每个字段的对齐方式，字体和颜色。
  • 您的代码比以前更简单，更易于阅读，从而节省您的时间和维护。

7、ContentView.swift代码说明：
//导入SwiftUI框架
import SwiftUI 		             

//定义一个名为ContentView的结构体，该结构体遵循View协议，遵循View协议的元素才可以在SwiftUI框架中。就像在UIKit中，所见皆UIView一样，在SwiftUI中，所见皆是View。
struct ContentView: View {		 
//添加View协议中的body属性，在body属性中通过SwiftUI提供的各种布局控件，完成界面元素的搭建。关键词some表示返回的是某种View，但是SwiftUI不需要在意是具体的哪种View
    var body: some View {
    	//在屏幕上显示一个标签，标签的内容位于双引号之内
        Text("Hello World")
    }
}

//当处于Debug模式时，允许执行下方的代码
#if DEBUG
//定义一个遵循PreviewProvider的结构体，用于设置在右侧预览区需要实时预览的内容
struct ContentView_Previews: PreviewProvider {
//添加PreviewProvider协议中的previews属性，用来设置在实时预览区显示的内容
    static var previews: some View {
    	//设置在实时预览区显示ContentView结构体中的内容，您还可以在此设置预览的模拟器尺寸、是否Dark Mode等选项。
        ContentView()
    }
}
#endif

8、SceneDelegate.swift代码说明：

//使用此方法可以选择性地配置UIWindow窗口，并将其附加到提供的UIWindowScene
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {

        if let windowScene = scene as? UIWindowScene {
	    //初始化一个UIWindow窗口对象
            let window = UIWindow(windowScene: windowScene)
	    // 使用一个UIHostingController实例，作为该窗口的根 view controller
            window.rootViewController = UIHostingController(rootView: ContentView())
	    // 将新建的窗口作为当前程序的窗口对象
            self.window = window
	    // 将窗口作为主窗口并显示
            window.makeKeyAndVisible()
        }
    }

第2节：Text-BasicStyle：

Text类似于UIKit中的UILabel，用于显示一行或多行的文字内容。
示例代码：
VStack{
    //Basic style
    Text("www.hdjc8.com")
	.bold()

    Text("www.hdjc8.com")
	.italic()

    Text("www.hdjc8.com")
	.underline()

    Text("www.hdjc8.com")
	.underline(true, color: .orange)

    Text("www.hdjc8.com")
	.strikethrough()

    Text("www.hdjc8.com")
	.strikethrough(true, color: .orange)

    Text("www.hdjc8.com")
	.foregroundColor(Color.orange)

    Text("www.hdjc8.com")
	.baselineOffset(CGFloat(5.0))
	.background(Color.orange)

     Text("www.hdjc8.com")
	 .background(Image("Picture"), alignment: .bottom)

    //Font
    VStack{
	Text("www.hdjc8.com")
	    .font(.footnote)

	Text("www.hdjc8.com")
	    .font(.system(size: 36))

	Text("www.hdjc8.com")
	    .font(.system(.title, design: .monospaced))

	Text("www.hdjc8.com")
	    .font(.custom("BradleyHandITCTT-Bold", size: 36))

	Text("www.hdjc8.com")
	    .fontWeight(Font.Weight.heavy)

	Text("www.hdjc8.com")
	    .fontWeight(Font.Weight.ultraLight)

    }
}
查看运行结果

第3节：Text-Paragraph：

关于Text的段落属性：
示例代码：
VStack{

    Text("www.hdjc8.com")

    Text("www.hdjc8.com")
	.tracking(10)

    Text("www.hdjc8.com")
	.kerning(10)

    Text("www.hdjc8.com")
	.blur(radius: 1)

    Text("SwiftUI is an innovative, exceptionally simple way to build user interfaces across all Apple platforms with the power of Swift.")
	.lineSpacing(20)
//                .lineLimit(1)
	.lineLimit(nil)

    Text("www.hdjc8.com")
	.offset(x: 40, y: 0)

    Text("www.hdjc8.com")
	.frame(width: 200, height: 80, alignment: .bottomTrailing)
	.background(Color.orange)

    VStack{
	Text("www.hdjc8.com2")
	    .position(x: 50, y: 50)
	    .frame(width: 300, height: 100, alignment: .bottomTrailing)
	    .background(Color.orange)

	Text("Interactive\ntutorials\nfor\nXcode!")
	    .multilineTextAlignment(.center)
	    .lineLimit(4)

	Text("Hello\nInteractive Tutorials!").multilineTextAlignment(.leading)
    }

}
查看运行结果

第4节：Text-Padding：

复用padding特性，制作轮廓效果~
示例代码：
VStack{
    Text("www.hdjc8.com")
	.background(Color.black)
	.foregroundColor(.white)
	.padding(20)

    Text("www.hdjc8.com")
	.padding()
	.background(Color.black)
	.foregroundColor(.white)

    Text("Swift User Interface")
	.font(.largeTitle)
	.foregroundColor(.black)
	.padding(15)
	.background(Color.yellow)
	.padding(15)
	.background(Color.orange)
	.padding(10)
	.background(Color.red)
}
查看运行结果

第5节：Text-FullScreen：

通过edgesIgnoringSafeArea，忽略安全区域，使文本框撑满屏幕。
示例代码：
Text("Hello World")
    .frame(minWidth: 0, maxWidth: .infinity, minHeight: 0, maxHeight: .infinity)
    .background(Color.orange)
    .font(.largeTitle)
    .edgesIgnoringSafeArea(.all)
查看运行结果

第6节：Text-DateFormatter：

对文本中的日期内容进行格式化。
示例代码：
var now = Date()
static let dateFormatter: DateFormatter = {
let formatter = DateFormatter()
formatter.dateStyle = .long
return formatter
}()

var body: some View {

Text("The time is: \(now, formatter: Self.dateFormatter)")
    .font(.title)
    .padding()

}
查看运行结果

第7节：Text-Append：

添加扩展方法+，对文本View进行拼接，实现富文本的艺术效果。
示例代码：
Text("Interactive ")
    .foregroundColor(.yellow)
    .fontWeight(.heavy)
+ Text("tutorials ")
    .foregroundColor(.orange)
    .strikethrough()
+ Text("for ")
    .foregroundColor(.red)
    .italic()
+ Text("SwiftUI")
    .foregroundColor(.purple)
    .underline()
查看运行结果

第8节：TextField：

TextField类似于UIKit中的UITextField，用于实现用户的文字内容的输入。
示例代码：
struct ContentView : View {
    
    @State var username : String
    @State var nickname : String
    
    var body: some View {
        
        VStack{
            
            Text("Your username is \(username)!")
            
            Text("Your nickname is \(nickname)!")
            
            TextField("User Name", text: $username, onEditingChanged: { (value) in
                print("onEditingChanged:\(self.username)")
            }) {
                print("onCommit:\(self.username)")
            }.textFieldStyle(RoundedBorderTextFieldStyle())
            
            TextField("Nick Name", text: $nickname)
                .textFieldStyle(RoundedBorderTextFieldStyle())
            
        }
        .padding()
        
    }
}

#if DEBUG
struct ContentView_Previews : PreviewProvider {
    
    static var previews: some View {
        ContentView(username: "", nickname: "")
    }
}
#endif
查看运行结果

第9节：TextField-SecureField：

相当于UITexfield的secureTextEntry的属性设置为true时的情况。
示例代码：
struct ContentView : View {
    
    @State var password : String
    
    var body: some View {
        
        VStack{
            
            Text("Your password is \(password)!")
            
            SecureField("Your password", text: $password) {
                print("Your password is \(self.password)!")
            }
            .textFieldStyle(RoundedBorderTextFieldStyle())
            
        }
        .padding()
        
    }
}
查看运行结果

第10节：Button：

相当于UIKit中的UIButton控件，用于实现接收用户的点击事件。
示例代码：
VStack{

    Button("First button") {
	print("---First button action.")
    }

    Button(action: {
	print("---Second button action.")
    }) {
	Text("Second button")
    }

    Button(action: {
	print("---Third button action.")
    }) {
	Image(systemName: "clock")
	Text("Third button")
    }
    .foregroundColor(Color.white)
    .background(Color.orange)

    //padding for button : the tap area is wrong
    Button(action: {
	print("---padding for button.")
    }){
	Text("Default padding")
    }
    .padding()
    .background(Color.yellow)

    //padding for label : the tap area is correct!
    Button(action: {
	print("---padding for label.")
    }){
	Text("Default padding")
	    .padding()
	    .background(Color.yellow)
    }

    Button(action: {
	print("---Button with image.")
    }){
	HStack {
	    Image(systemName: "star")
	    Text("Button with image")
	}
	.padding()
	    .background(Color.yellow)
    }
    Button(action: {
	print("---modifier button")
    }){
	Text("modifier button")
	    .modifier(MyButtonStyle())
    }
}
查看运行结果

第11节：Button-sheet：

当点击按钮时，弹出Modl模态窗口。
示例代码：
struct ContentView : View {

    @State var isPresented = false
    
    var body: some View {
        VStack{
            Button("Show modal") {
                self.isPresented = true
            }.sheet(isPresented: $isPresented, content: {
                MyDetailView(message: "Modal window")
            })
        }
    }
}

struct MyDetailView: View {
    let message: String

    var body: some View {
        VStack {
            Text(message)
                .font(.largeTitle)
        }
    }
}
查看运行结果

第12节：Spacer：

Spacer是一个灵活的空间视图，它可以沿着包含堆栈布局的主轴进行扩展，如果不包含在堆栈中，则在两个x或y轴上进行扩展。
示例代码：
var body: some View {
        VStack{
            HStack {
                Image(systemName: "clock")
                Spacer()
           }
           .padding()
        
           HStack {
                Image(systemName: "clock")
                Spacer()
                Text("\(Date())")
           }
           .padding()
        
            HStack {
                 Image(systemName: "clock")
                 Spacer(minLength: 50)
                 Text("\(Date())")
            }
            .padding()
        }
    }
查看运行结果

第13节：Divider：

当Divider包含在VStack或YStack中时，Divider跨越堆栈的短轴延伸，或者当不在堆栈中时则进行水平分隔。
示例代码：
VStack{
    VStack {
	 Image(systemName: "clock")
	 Divider()
	 Text("\(Date())")
    }
    .padding()

    VStack {
	 Image(systemName: "clock")
	 Divider()
	    .background(Color.purple)
	    .scaleEffect(CGSize(width: 1, height: 10))
	 Text("\(Date())")
    }
    .padding()
}
查看运行结果

第14节：Image-Basic：

Image相当于UIKit中的UIImage控件，用于显示指定名称的图片，或者显示指定systemName的图标。
示例代码：
VStack{
            
    Image("girlPicture")

    Image(systemName: "arkit")
	.foregroundColor(.orange)
	.font(.system(size: 48))

    Image("girlPicture")
	.resizable()
	.aspectRatio(contentMode: .fit)
}
.padding()
查看运行结果

第15节：Image-Style：

设置图像的边框、不透明度、阴影等属性。
示例代码：
ScrollView{
     VStack{

	Image("girlPicture")
	    .border(Color.orange)

	Image("girlPicture")
	    .border(Color.orange, width: 10)

	Image("girlPicture")
	    .opacity(0.5)

	Image("girlPicture")
	    .shadow(radius: 10)

	Image("girlPicture")
	    .shadow(color: .purple, radius: 20, x: 20, y: 20)
    }
}
查看运行结果

第16节：Image-Processing：

给图片进行图像颜色的设置：设置模糊效果、设置图片的亮度、反转图片的颜色、对比度等效果
示例代码：
ScrollView{
     VStack{
	Image("girlPicture")

	Image("girlPicture")
	    .blur(radius: CGFloat(2))

	Image("girlPicture")
	    .blur(radius: CGFloat(2), opaque: true)

	Image("girlPicture")
	    .brightness(0.2)

	Image("girlPicture")
	    .colorInvert()

	Image("girlPicture")
	    .colorMultiply(Color.yellow)

	Image("girlPicture")
	    .contrast(1.5)
    }

    VStack{
	Image("girlPicture")
	    .hueRotation(Angle.degrees(180))

	Image("girlPicture")
	    .saturation(10)

	Image("girlPicture")
	    .grayscale(5.5)

	Image("girlPicture")
	    .luminanceToAlpha()
    }
}
查看运行结果

第17节：Image-Blend：

在图像之间进行颜色像素之间的运算。
示例代码：
VStack{
            
    Image("girlPicture")
	.blendMode(.difference)

    ZStack{
	Image("texture")
	Image("girlPicture")
	    .blendMode(.multiply)
    }
}
.padding()
查看运行结果

第18节：Image-Mask：

给图片添加遮罩效果。
示例代码：
VStack{

    Image("girlPicture")
	.clipShape(Circle())

    Image("girlPicture")
	.mask(Circle())

    Image("texture")
    .resizable()
    .frame(width: 300, height: 300)
    .mask(
	Text("SWIFT UI!")
	    .font(Font.system(size: 64).bold()))

}
查看运行结果

第19节：Image-Transform：

给图像应用缩放、旋转等变形效果。
示例代码：
ScrollView{
            
    VStack{
	Image("girlPicture")
	    .scaleEffect(0.8)

	Image("girlPicture")
	    .scaleEffect(CGSize(width: 1.2, height: 1))

	Image("girlPicture")
	    .scaleEffect(x: 1.5, y: 1, anchor: UnitPoint.bottomLeading)
    }

     VStack{

	Image("girlPicture")
	     .rotationEffect(Angle.init(degrees: 90))

	Image("girlPicture")
	    .rotationEffect(Angle.init(degrees: 30), anchor: UnitPoint.init(x: 0, y: 0))

	Image("girlPicture")
	    .rotation3DEffect(Angle.init(degrees: 30), axis: (x: CGFloat(0.1), y: CGFloat(0.1), z: CGFloat(0)))

    }
}
查看运行结果

第20节：Image-Web：

异步加载网络图片。
示例代码：
struct ContentView : View {
    
    @State private var remoteImage : UIImage? = nil
    let placeholderOne = UIImage(named: "Picture")
    
    var body: some View {
        Image(uiImage: self.remoteImage ?? placeholderOne!)
            .onAppear(perform: fetchRemoteImage)
    }
    
    func fetchRemoteImage()
    {
        guard let url = URL(string: "http://hdjc8.com/images/logo.png") else { return }
        URLSession.shared.dataTask(with: url){ (data, response, error) in
            if let image = UIImage(data: data!){
                self.remoteImage = image
            }
            else{
                print(error ?? "")
            }
        }.resume()
    }
}
查看运行结果

第21节：Picker：

Picker相当于UIKit中的UIPickerView，用于实现若干项目的选择。
示例代码：
struct ContentView : View {
    
     var fruits = ["Apple", "Banner", "Pear", "Watermelon"]
     var colors = [Color.blue, Color.orange, Color.red, Color.purple]
     @State private var selectedItem = 0

     var body: some View {
        VStack {
            
           Picker(selection: $selectedItem, label: Text("Fruits")) {
              ForEach(0 ..< fruits.count) {
                Text(self.fruits[$0]).tag($0).foregroundColor(self.colors[$0])
              }
           }
           Text("Your choice: ")
            + Text("\(fruits[selectedItem])").foregroundColor(self.colors[selectedItem])
        }
     }
}
查看运行结果

第22节：PickerDate：

PickerDate相当于UIKit中的UIDatePicker控件，用于实现时间和日期项目的选择。
示例代码：
struct ContentView : View {
    var myDateFormatter: DateFormatter {
        let formatter = DateFormatter()
        formatter.dateStyle = .long
        return formatter
    }

    @State var selectedDate = Date()

    var body: some View {
        VStack {
            DatePicker(selection: $selectedDate, displayedComponents: DatePickerComponents.hourAndMinute) {
                Text("Date")
            }
            
            DatePicker(selection: $selectedDate, displayedComponents: DatePickerComponents.date) {
                Text("Date")
            }

            DatePicker(selection: $selectedDate,in: Date()...Date().advanced(by: 7*24*3600), displayedComponents: [.date, .hourAndMinute]) {
                Text("Date")
            }

            Text("Your Choice: \(selectedDate, formatter: myDateFormatter)")
        }
    }
}
查看运行结果

第23节：Slider：

Slider相当于UIKit中的UISlider，通过移动滑杆实现指定区域和间隔的数值的选择。
示例代码：
struct ContentView : View {
    
     @State var temperature: Double = 0

       var body: some View {
           VStack {
                Slider(value: $temperature)
                Slider(value: $temperature, in: -20...40)
                Slider(value: $temperature, in: -20...40) { (item) in
                    print(item)
                }
                HStack{
                    Image(systemName: "sun.max")

                    Slider(value: $temperature, in: -20...40, step: 2) { (item) in
                        print(item)
                    }.accentColor(.pink).colorInvert()
                    
                   Image(systemName: "sun.max.fill")
                }.padding()

                Text("The temperature is \(Int(temperature)).")
           }
       }
}
查看运行结果

第24节：Stepper：

Stepper步进器相当于UIKit中的UIStepper，用于实现数据的递增和递减。
示例代码：
struct ContentView : View {
    
     @State var temperature: Double = 0

       var body: some View {
        
           VStack {
                Stepper(onIncrement: {
                    self.temperature += 1
                }, onDecrement: {
                    self.temperature -= 1
                }, label: { Text("Temperature: \(Int(temperature))") })
                
                Stepper(onIncrement: {
                    self.temperature += 1
                }, onDecrement: {
                    self.temperature -= 1
                }, onEditingChanged: { (item) in
                    print(item)
                }, label: { Text("Temperature: \(Int(temperature))") })
           
       }.padding()
    }
}
查看运行结果

第25节：Segment：

Segment分段控件，类似于UIKit中的UISegmentedControl。分段控件提供一栏选项按钮，一次只能激活其中一个选项按钮。用于实现若干选项的单选。
示例代码：
struct ContentView : View {
    
    private var animals = ["🐶 Dog", "🐯 Tiger", "🐷 Pig"]
    var colors = [Color.yellow, Color.orange, Color.red, Color.purple]
    @State private var selectedAnimal = 0

    var body: some View {
        VStack {
            Picker(selection: $selectedAnimal, label: Text("animals")) {
               ForEach(0 ..< animals.count) {
                Text(self.animals[$0]).tag($0)
               }
            }.pickerStyle(SegmentedPickerStyle())
            Text("Your choice: \(animals[selectedAnimal])")
        }
    }
}
查看运行结果

第26节：Toggle：

Toggle相当于UIKit中的UIToggle，用于实现选项开关(开户或关闭)的功能。
示例代码：
struct ContentView : View {
    @State var showNotification = true

    var body: some View {
        VStack {
            Text("Show Notification: ")
            + Text("\(self.showNotification.description)")
                .foregroundColor(.green)
                .bold()
                
            
            Toggle(isOn: $showNotification) {
                Text("Show notification:")
            }.padding()
        }
    }
}
查看运行结果

第27节：TabView：

TabView相当于UIKit中的UITabBarController，用于实现标签视图集。
示例代码：
var body: some View {
	TabView {
	    Text("The home page.")
		.font(.system(size: 36))
		.tabItem({
		    Image(systemName: "house")
		    Text("Home") })
		.tag(0)

	    Text("The settings page")
		.font(.system(size: 36))
		.tabItem({
		    Image(systemName: "gear")
		    Text("Settings")
		})
		.tag(1)
	}
    }
查看运行结果

第28节：使用UIKit中的Webview：

SwiftUI并没有包含WebView，这里通过遵循UIViewRepresentable协议，在SwiftUI中集成UIKit中的WKWebView。
示例代码：
import SwiftUI
import WebKit

struct ContentView : UIViewRepresentable {
    
    func makeUIView(context: UIViewRepresentableContext<ContentView>) -> WKWebView {
        return WKWebView()
    }
    
    func updateUIView(_ uiView: WKWebView, context: UIViewRepresentableContext<ContentView>) {
        let request = URLRequest(url:URL(string: "https://apple.com")!)
        uiView.load(request)
    }
}
查看运行结果

第29节：MapView：

SwiftUI并没有包含MapView，这里通过遵循UIViewRepresentable协议，在SwiftUI中集成UIKit中的WKMapView。
示例代码：
import SwiftUI
import MapKit

struct ContentView : UIViewRepresentable {
    
    func makeUIView(context: UIViewRepresentableContext<ContentView>) -> MKMapView {
        return MKMapView()
    }
    
    func updateUIView(_ uiView: MKMapView, context: UIViewRepresentableContext<ContentView>) {
        uiView.showsUserLocation = true
        uiView.mapType = MKMapType.satellite
        
        let coordinate2D = CLLocationCoordinate2D(latitude: 39.915352, longitude: 116.397105)
        let zoomLevel = 0.02
        let region = MKCoordinateRegion(center: coordinate2D, span: MKCoordinateSpan(latitudeDelta: zoomLevel, longitudeDelta: zoomLevel))
        uiView.setRegion(uiView.regionThatFits(region), animated: true)
    }
}
查看运行结果

第30节：Shape-Circle：

使用Circle绘制圆，并设置圆形的填充颜色、显示区域等属性。
示例代码：
VStack{
    Circle()
    Circle()
	.fill(Color.orange)
	.frame(width: 200, height: 200)
    ZStack {
       Circle().fill(Color.purple)
       Circle().fill(Color.yellow).scaleEffect(0.8)
       Circle().fill(Color.orange).scaleEffect(0.6)
    }
    Rectangle()
    Rectangle()
	.fill(Color.orange)
	.frame(width: 200, height: 200)
    ZStack {
       Rectangle().fill(Color.purple)
	.frame(width: 300, height: 200)

       Rectangle().fill(Color.yellow)
	.frame(width: 300, height: 200)
	.scaleEffect(0.8)

       Rectangle()
	.fill(Color.orange)
	.frame(width: 300, height: 200)
	.scaleEffect(0.6)
    }
}
查看运行结果

第31节：Shape-Rectangle：

使用Rectangle绘制矩形，使用RoundedRectangle绘制圆角矩形。
示例代码：
VStack{
            
    Rectangle()
    Rectangle()
	.fill(Color.orange)
	.frame(width: 200, height: 200)

    ZStack {
       Rectangle().fill(Color.purple)
	.frame(width: 300, height: 200)

       Rectangle().fill(Color.yellow)
	.frame(width: 300, height: 200)
	.scaleEffect(0.8)

       Rectangle()
	.fill(Color.orange)
	.frame(width: 300, height: 200)
	.scaleEffect(0.6)
    }

    RoundedRectangle(cornerRadius: 120)

    RoundedRectangle(cornerSize: CGSize(width: 100, height: 40)).frame(width: 300, height: 200)

    RoundedRectangle(cornerRadius: 100, style: RoundedCornerStyle.continuous)

}
查看运行结果

第32节：32Shape-Path：

使用Path，并配合move和addLine绘制自定义的图形
示例代码：
Path { path in
   path.move(to: CGPoint(x: 30, y: 0))
   path.addLine(to: CGPoint(x: 30, y: 200))
   path.addLine(to: CGPoint(x: 230, y: 200))
    path.addLine(to: CGPoint(x: 230, y: 0))
}

Path { path in
    path.addEllipse(in: CGRect(x: 100, y: 30, width: 200, height: 200))

    path.addRoundedRect(in: CGRect(x: 100, y: 120, width: 200, height: 200), cornerSize: CGSize(width: 10, height: 10))

    path.addEllipse(in: CGRect(x: 100, y: 210, width: 200, height: 200))
}
查看运行结果

第33节：LinearGradien：

使用LinearGradien绘制线形颜色渐变的背景。
示例代码：
Text("SwifUI Gradient")
    .font(.system(size: 36))
    .padding()
    .foregroundColor(.white)
    .background(LinearGradient(gradient: Gradient(colors: [.orange, .red, .purple]), startPoint: .topLeading, endPoint: .bottomTrailing))

}
查看运行结果

第34节：AngularGradient：

使用AngularGradient绘制角度颜色渐变的背景。
示例代码：
VStack{
    Text("SwifUI Gradient")
    .font(.system(size: 36))
    .padding()
    .foregroundColor(.white)
    .background(AngularGradient(gradient: Gradient(colors: [.orange, .red, .purple]), center: UnitPoint(x: 0.5, y: 0.5), angle: Angle.init(degrees: -45)))

    Text("SwifUI Gradient")
    .font(.system(size: 36))
    .padding()
    .foregroundColor(.white)
    .background(AngularGradient(gradient: Gradient(colors: [.orange, .red, .purple]), center: UnitPoint(x: 0.5, y: 0.5), startAngle: Angle.init(degrees: 0), endAngle: Angle.init(degrees: 0)))

}
查看运行结果

第35节：RadialGradient：

使用RadialGradient绘制径向颜色渐变的背景。
示例代码：
Text("SwifUI Gradient")
    .font(.system(size: 36))
    .padding()
    .foregroundColor(.white)
    .background(RadialGradient(gradient: Gradient(colors: [.orange, .red, .purple]), center: .init(x: 0.5, y: 0.5), startRadius: CGFloat(10), endRadius: CGFloat(120)))

}
查看运行结果

第二章 动画Animation

第1节：scaleEffect+default

通过scaleEffect和Animation方法，实现default类型的缩放动画。
示例代码：
struct ContentView : View {
    
    @State var factor: CGFloat = 1

    var body: some View {
        
        VStack{
            Image("logo")
                .scaleEffect(factor)	//设置Image的缩放比例为factor
                .animation(.default)	//给Image添加default类型的动画效果
            
            Divider().fixedSize()
            
            Button(action: {
                self.factor += 0.2	//当按钮点击时增加Image的缩放比例
            }) {
                Text("Zoom in")
            }
        }
    }
}
查看运行结果

第2节：Opacity+linear

通过scaleEffect、opacity和withAnimation方法，实现linear类型的缩放动画，并设置动画的时长为1秒。
示例代码：
struct ContentView : View {
    
    @State var factor: Double = 1
    @State var alpha: Double = 1

    var body: some View {
        Image("logo")
            .scaleEffect(CGFloat(factor))
            .opacity(alpha)
            .onTapGesture {
                withAnimation(.linear(duration: 1.0)) {
                    self.factor += 0.1
                    self.alpha -= 0.2
                }
            }
    }
}
查看运行结果

第3节：Offset+easeOut

通过offset、animation方法，实现easeOut类型的缩放动画，并设置动画的时长为2秒。
示例代码：
struct ContentView : View {
    
    @State var distance: Double = 0

    var body: some View {
        VStack{
            Image("logo")
                .offset(x: 0, y: CGFloat(distance))
                .animation(.easeOut(duration: 2))
            
            Divider().fixedSize()
            
            Button(action: {
                self.distance -= 120
            }) {
                Text("Move Effect")
            }
            
        }
        
    }
}
查看运行结果

第4节：RotationEffect+spring


示例代码：
struct ContentView : View {
    
    @State var angle: Double = 0

    var body: some View {
        VStack{
            Image("logo")
            .rotationEffect(Angle.init(degrees: angle))
            .animation(.spring())
            
            Divider().fixedSize()
            
            Button(action: {
                self.angle += 90
            }) {
                Text("Rotation Effect")
            }
        }
    }
}
查看运行结果

第5节：CombinedAnimation


示例代码：
struct ContentView : View {
    
    @State var radius: Double = 0
    @State var brightness: Double = 0

    var body: some View {
        VStack{
            Image("logo")
                .shadow(radius: CGFloat(radius))
                .brightness(brightness)
                .animation(.linear(duration: 2))
            
            Divider().fixedSize()
            
            Button(action: {
                self.radius += 10
                self.brightness = 1
            }) {
                Text("Move Effect")
            }
            
        }
        
    }
}
查看运行结果

第6节：SpeadAndDelay


示例代码：
struct ContentView : View {
    @State var factor: Double = 1.0
    
    var animation: Animation {
        Animation.linear(duration: 1)
//            .speed(1)
//            .speed(5)
            .delay(2)
    }

    var body: some View {
        VStack{
            Image("logo")
            .scaleEffect(CGFloat(factor))
            .animation(animation)
            
            Divider().fixedSize()
            
            Button(action: {
                self.factor += 0.2
            }) {
                Text("Zoom In Effect")
            }
        }
    }
}
查看运行结果

第7节：Repeating


示例代码：
struct ContentView : View {
    
    @State var angle: Double = 0
    
    var animation: Animation {
        Animation.spring()
             .repeatForever()
//            .repeatForever(autoreverses: false)
//            .repeatCount(3)
    }

    var body: some View {
        VStack{
            Image("logo")
                .rotationEffect(Angle.init(degrees: angle))
                .animation(animation)
            
            Divider().fixedSize()
            
            Button(action: {
                self.angle += 45
            }) {
                Text("Repeat Forever Effect")
            }
        }
    }
}
查看运行结果

第8节：ToggleVisibility


示例代码：
struct ContentView : View {
    
    @State var showingPassword = false
    @State var password = ""

    var body: some View {
        
        VStack {
            Toggle(isOn: $showingPassword.animation(.spring())) {
                Text("Toggle Password")
            }

            if showingPassword {
                TextField("Password", text: $password)
                    .padding()
                    .border(Color.green, width: 1)
            }
        }
        .padding()
    }
}
查看运行结果

第9节：AsymmetricTransition


示例代码：
struct ContentView : View {
    @State var showPicture = false

    var body: some View {
        VStack {
            Button(action: {
                withAnimation {
                    self.showPicture.toggle()
                }
            }) {
                Text("Show picture")
            }

            if showPicture {
//                Image("logo")
                
//                Image("logo")
//                    .transition(.move(edge: .top))
                
//                Image("logo")
//                    .transition(.scale(scale: 0))
                
//                Image("logo")
//                    .transition(.slide)
                
//                Image("logo")
//                    .transition(.asymmetric(insertion: .scale(scale: 0), removal: .slide))
                
                Image("logo")
                    .transition(AnyTransition.scale(scale: 0).combined(with:.slide))
            }
        }
    }
}
查看运行结果

第三章 手势Gesture

第1节：TapGesture+Single tap


示例代码：
struct ContentView : View {
    
    @State var isPressed = false
    
    var body: some View {
        let tapGesture = TapGesture()
            .onEnded { _ in
                self.isPressed.toggle()
        }
        
        return Circle()
            .fill(Color.orange)
            .frame(width: 240, height: 240)
            .gesture(tapGesture)
            .scaleEffect(isPressed ? 1.4 : 1)
            .animation(.default)
    }
}
查看运行结果

第2节：TapGesture+Double tap


示例代码：
struct ContentView : View {
    
    @State var isPressed = false
    
    var body: some View {
        
        return Circle()
            .fill(Color.orange)
            .frame(width: 240, height: 240)
            .scaleEffect(isPressed ? 1.4 : 1)
            .animation(.default)
            .onTapGesture(count: 2) {
                self.isPressed.toggle()
                print("Double tap.")
        }
    }
}
查看运行结果

第3节：LongPressGesture


示例代码：
struct ContentView : View {
    
    @GestureState var isLongPressed = false
    
    var body: some View {
        let longPressGesture = LongPressGesture()
            .updating($isLongPressed) { value, state, transcation in
                print(value, state, transcation)
                state = value
            }
            .onEnded { (value) in
                print(value)
            }
        
        return Circle()
            .fill(Color.orange)
            .frame(width: 240, height: 240)
            .gesture(longPressGesture)
            .scaleEffect(isLongPressed ? 1.4 : 1)
            .animation(.default)
    }
}
查看运行结果

第4节：RotationGesture


示例代码：
struct ContentView : View {
    
    @State var angle = 0.0
    
    var body: some View {
        let rotationGesture = RotationGesture(minimumAngleDelta: Angle.init(degrees: 20))
            .onChanged({ (angle) in
                
                self.angle += angle.animatableData
            }).onEnded { (angle) in
                print(self.angle)
        }
        
        return Image("logo")
            .gesture(rotationGesture)
            .rotationEffect(Angle.init(degrees: self.angle))
    }
}
查看运行结果

第5节：DragGesture


示例代码：
struct ContentView : View {
    
    @State var offset: CGSize = .zero
    
    var body: some View {
        let dragGesture = DragGesture()
            .onChanged { (value) in
                print(value.startLocation, value.location, value.translation)
                self.offset = value.translation
            }
            .onEnded { (value) in
                if(abs(value.translation.width) >= 40 || abs(value.translation.height - (-260)) >= 40){
                    self.offset = .zero
                }
                else{
                    self.offset = CGSize(width: 0, height: -260)
                }
            }
        
        return VStack{
            Circle()
                .fill(Color.black)
                .opacity(0.1)
                .frame(width: 200, height: 200)
                .offset(CGSize(width: 0, height: -50))
            
            Circle()
                .fill(Color.orange)
                .frame(width: 200, height: 200)
                .offset(offset)
                .gesture(dragGesture)
                .animation(.spring())
        }
        
    }
}
查看运行结果

第6节：LongPressGestureAndDragGesture


示例代码：
struct ContentView : View {
    
    @State var offset: CGSize = .zero
    @GestureState var isLongPressed = false
    
    var body: some View {
        let longPressGesture = LongPressGesture()
            .updating($isLongPressed) { value, state, transcation in
                print(value, state, transcation)
                state = value
        }
        .onEnded { (value) in
            print(value)
        }
        
        let dragGesture = DragGesture()
            .onChanged { (value) in
                print(value.startLocation, value.location, value.translation)
                self.offset = value.translation
        }
        .onEnded { (value) in
            if(abs(value.translation.width) >= 40 || abs(value.translation.height - (-260)) >= 40){
                self.offset = .zero
            }
            else{
                self.offset = CGSize(width: 0, height: -260)
            }
        }
        .simultaneously(with: longPressGesture)
        
        return VStack{
            Circle()
                .fill(Color.black)
                .opacity(0.1)
                .frame(width: 200, height: 200)
                .offset(CGSize(width: 0, height: -50))
            
            Circle()
                .fill(Color.orange)
                .frame(width: 200, height: 200)
                .offset(offset)
                .gesture(dragGesture)
                .scaleEffect(isLongPressed ? 1.4 : 1)
                .animation(.spring())
        }
        
    }
}
查看运行结果

第四章 布局Layout

第1节：Group


示例代码：
struct ContentView : View {
    
    var body: some View {
        Group {
            Text("Apple")
            Text("Banana")
            Text("Orange")
            Text("Watermelon")
            Text("Grape")
            Text("Papaya")
            Text("Pear")
        }
        .font(.title)
        .foregroundColor(.orange)
        .padding()
    }
}
查看运行结果

第2节：HSTack


示例代码：
struct ContentView : View {
    
    var body: some View {
        HStack(alignment: .bottom, spacing: 40){
            Image(systemName: "book.fill")
            Text("Interactive Tutorials")
            Spacer()
            Image(systemName: "icloud.and.arrow.down")
        }
        .padding()
    }
}
查看运行结果

第3节：VSTack


示例代码：
struct ContentView : View {
    
    var body: some View {
        VStack{
            Text("The fruit and the tree")
                .font(.largeTitle)
            Image("Apple")
            Text("An apple is a sweet, edible fruit produced by an apple tree Apple trees are cultivated worldwide and are the most widely grown species in the genus Malus.")
                .font(.body)
                .lineLimit(nil)
                .frame(height: 200)
        }.padding()
    }
}
查看运行结果

第4节：ZSTack


示例代码：
struct ContentView : View {
    
    var body: some View {
        ZStack(alignment: .center){
            Image("beach").clipShape(Circle())
            Text("Sea beach")
                .font(.system(size: 48))
                .foregroundColor(.white)
            Text("Hawaii - USA")
                .font(.system(size: 14))
                .foregroundColor(.white)
                .offset(x: 0, y: 36)
        }.padding(10)
    }
}
查看运行结果

第5节：List-Basic


示例代码：
struct ContentView : View {
    @State var languages = ["Objective-C", "Swift", "Flutter"]

            var body: some View {
                
                List{
                    Text("Objective-C")
                    Text("Swift")
                    Text("Flutter")
                }
                
//                List(0..<5) { item in
//                    Text("Item : \(item)")
//                }
                
//                ForEach(languages, id: \.self) { language in
//                    Text(language)
//                }
            }
}
查看运行结果

第6节：List-Insert


示例代码：
struct ContentView : View {
    
    @State var languages = ["Objective-C", "Swift", "Flutter"]

    var body: some View {
        NavigationView {
            List {
                ForEach(languages, id:\.self) { language in
                    Text(language)
                }.onInsert(of: ["demo"], perform: { (offset, message) in
                    print(offset)
                })
            }
            .navigationBarTitle(Text("Edit Row"), displayMode: .large)
            .navigationBarItems(trailing: EditButton())
        }.padding()
    }

    func insertItem(to offsets: Int, message : [NSItemProvider]) {
        languages.insert(message[0].description, at: offsets)
    }
    
}
查看运行结果

第7节：List-Delete


示例代码：
struct ContentView : View {

        @State var languages = ["Objective-C", "Swift", "Flutter"]

        var body: some View {
            NavigationView {
                List {
                    ForEach(languages,id: \.self) { language in
                        Text(language)
                    }
                    .onDelete(perform: delete)
                }
                .navigationBarItems(trailing: EditButton())
            }
        }

        func delete(at offsets: IndexSet) {
            if let first = offsets.first {
                languages.remove(at: first)
            }
        }
    }
查看运行结果

第8节：List-Move


示例代码：
struct ContentView : View {
    @State var languages = ["Objective-C", "Swift", "Flutter"]

    var body: some View {
        NavigationView {
            List {
                ForEach(languages,id: \.self) { language in
                    Text(language)
                }
                .onMove { (source, destination) in
                    self.languages.move(fromOffsets: source, toOffset: destination)
                }
            }
            .navigationBarTitle(Text("Edit Row"), displayMode: .large)
            .navigationBarItems(trailing: EditButton())
        }
    }

    func moveItem(from source: IndexSet, to destination: Int) {
        languages.move(fromOffsets: source, toOffset: destination)
        print(languages)
    }
}
查看运行结果

第9节：List-DeleteAndMove


示例代码：
struct ContentView : View {
    @State var languages = ["Objective-C", "Swift", "Flutter"]

    var body: some View {
        NavigationView {
            List {
                ForEach(languages, id: \.self) { language in
                    Text(language)
                }
                .onDelete(perform: deleteItem)
                .onMove(perform: moveItem)
            }
            .navigationBarTitle(Text("Edit Row"), displayMode: .large)
            .navigationBarItems(trailing: EditButton())
        }
    }

    func deleteItem(at offsets: IndexSet) {
        if let first = offsets.first {
            languages.remove(at: first)
        }
    }
    
    func moveItem(from source: IndexSet, to destination: Int) {
        languages.move(fromOffsets: source, toOffset: destination)
    }
}
查看运行结果

第10节：ScrollView-Vertical


示例代码：
struct ContentView : View {
    @State var languages = ["Objective-C", "Swift", "Flutter"]

    var body: some View {
            ScrollView(.vertical, showsIndicators: false) {
                VStack(alignment: HorizontalAlignment.leading, spacing: 20){

                    Text("Overview")
                    .font(.system(size: 48))
                    .padding(10)
                    Text("With the power of Xcode, the ease of Swift, and the revolutionary features of cutting-edge Apple technologies, you have the freedom to create your most innovative apps ever.\nSwiftUI provides views, controls, and layout structures for declaring your app's user interface. The framework provides event handlers for delivering taps, gestures, and other types of input to your app, and tools to manage the flow of data from your app's models down to the views and controls that users will see and interact with.")
                    .lineLimit(nil)
                    .frame(width: 300, height: 240, alignment: .topLeading)
                    .padding(10)
                    
                    Image("iPhone")
                    .resizable()
                    .frame(width: 300, height: 556, alignment: .center)
                }
            }
            .background(Color.orange)
            .padding(10)
            .navigationBarTitle(Text("ScrollView"))
        }
    }
查看运行结果

第11节：ScrollView-Horizontal


示例代码：
struct ContentView : View {
    @State var languages = ["Objective-C", "Swift", "Flutter"]

    var body: some View {
            ScrollView(.horizontal, showsIndicators: true) {
                HStack(alignment:.center, spacing: 20){

                    Image("iPhone")
                        .resizable()
                        .frame(width: 300, height: 556, alignment: .center)

                    Image("iPhoneSerial")
                        .resizable()
                        .frame(width: 823, height: 556, alignment: .center)

                    Image("iPhone")
                        .resizable()
                        .frame(width: 300, height: 556, alignment: .center)
                }
            }
            .background(Color.orange)
            .padding(10)
        }
    }
查看运行结果

第12节：ScrollView-VerticalAndHorizontal


示例代码：
struct ContentView : View {
    @State var languages = ["Objective-C", "Swift", "Flutter"]

    var body: some View {
        ScrollView(.vertical, showsIndicators: false) {
            VStack(alignment: HorizontalAlignment.leading, spacing: 20){

                Text("Overview")
                .font(.system(size: 48))
                .padding(10)
                Text("With the power of Xcode, the ease of Swift, and the revolutionary features of cutting-edge Apple technologies, you have the freedom to create your most innovative apps ever.\nSwiftUI provides views, controls, and layout structures for declaring your app's user interface. The framework provides event handlers for delivering taps, gestures, and other types of input to your app, and tools to manage the flow of data from your app's models down to the views and controls that users will see and interact with.")
                .lineLimit(nil)
                .frame(width: 300, height: 350, alignment: .topLeading)
                .padding(10)
                
                ScrollView(.horizontal, showsIndicators: true) {
                    HStack(alignment:.center, spacing: 20){

                        Image("iPhone")
                            .resizable()
                            .frame(width: 189, height: 350, alignment: .center)

                        Image("iPhoneSerial")
                            .resizable()
                            .frame(width: 518, height: 350, alignment: .center)

                        Image("iPhone")
                            .resizable()
                            .frame(width: 189, height: 350, alignment: .center)
                    }
                }
                .background(Color.orange)
                .padding(10)
            }
        }
        .background(Color.orange)
        .padding(10)
        .navigationBarTitle(Text("ScrollView"))
    }
}
查看运行结果

第13节：Form-Basic


示例代码：
struct ContentView : View {

    private var languages = ["Swift", "Objective-C"]
    @State private var selectedLanguage = 0
    @State var workingYear: Double = 2
    @State var enableNotification = false

    var body: some View {
        NavigationView {
            Form {
                Picker(selection: $selectedLanguage, label: Text("Languages")) {
                   ForEach(0 ..< languages.count) {
                    Text(self.languages[$0]).tag($0)
                   }
                }.pickerStyle(SegmentedPickerStyle())
                HStack{
                    Text("Working years")
                    Slider(value: $workingYear, in: 1...10, step: 1)
                }
                
                Toggle(isOn: $enableNotification) {
                    Text("Enable Notification")
                }

                Button(action: {
                    print("Your programming language: \(self.languages[self.selectedLanguage])")
                    print("Your working years: \(Int(self.workingYear))")
                    print("Enable notification: \(self.enableNotification)")
                }) {
                    Text("Submit")
                }
            }.navigationBarTitle(Text("Profiles"))
        }
    }
}
查看运行结果

第14节：Form-Segment


示例代码：
struct ContentView : View {
    private var languages = ["Swift", "Objective-C"]
    @State private var selectedLanguage = 0
    @State var workingYear: Double = 2
    @State var enableNotification = false
    var body: some View {
        NavigationView {
            Form {
                Section(header: Text("Please enter your information:"), footer: Text("Note: Enabling notification to get more infomration")) {
                    Picker(selection: $selectedLanguage, label: Text("Languages")) {
                       ForEach(0 ..< languages.count) {
                        Text(self.languages[$0]).tag($0)
                       }
                    }.pickerStyle(SegmentedPickerStyle())
                    HStack{
                        Text("Working years")
                        Slider(value: $workingYear, in: 1...10, step: 1)
                    }
                    
                    Toggle(isOn: $enableNotification) {
                        Text("Enable Notification")
                    }
                }
                Button(action: {
                // activate theme!
                    print("Your programming language: \(self.languages[self.selectedLanguage])")
                    print("Your working years: \(Int(self.workingYear))")
                    print("Enable notification: \(self.enableNotification)")
                }) {
                    Text("Submit")
                }
            }.navigationBarTitle(Text("Profiles"))
        }
    }
}
查看运行结果

第15节：Form-EnableDisable


示例代码：
struct ContentView : View {

    @State var enableForm = false
    @State var enableNotification = false
    @State var userName = ""
    @State var password = ""

    var body: some View {
        NavigationView {
            Form {
                Toggle(isOn: $enableForm) {
                    Text("Enable Form")
                }
                
                Section(header: Text("Please enter your information:")) {
                    
                    TextField("Username", text: $userName)
                    SecureField("Password", text: $password)
                    Toggle(isOn: $enableNotification) {
                        Text("Enable Notification")
                    }
                }.disabled(enableForm)
                
            }.navigationBarTitle(Text("Profiles"))
        }
    }
}
查看运行结果

第16节：Form-ShowHide


示例代码：
struct ContentView : View {

    @State var showingVisible = false
    @State var userName = ""
    @State var password = ""

    var body: some View {
        NavigationView {
            Form {
                Toggle(isOn: $showingVisible.animation()) {
                    if(showingVisible){
                        Text("Hide Form")
                    }
                    else{
                        Text("Show Form")
                    }
                }
                
                if(showingVisible)
                {
                    Section(header: Text("Please enter your information:")) {
                        
                        TextField("Username", text: $userName)
                        SecureField("Password", text: $password)
                    }
                }
            }.navigationBarTitle(Text("Profiles"))
        }
    }
}
查看运行结果

第五章 布局Layout

第1节：NavigationLink


示例代码：
struct ContentView : View {
    
    @State var isPresented = false
    var body: some View {
//            NavigationView {
//                HStack{
//                    NavigationLink(destination: Text("Detail Page #1") ) {
//                        Text("Go detail Page #1 >")
//                    }
//                    .navigationBarTitle("Index Page #1")
//                    .accentColor(Color.orange)
//                }
//            }
        
            NavigationView {
                HStack{
                    NavigationLink(destination: MyDetailView(message: "Detail Page #2") ) {
                        Text("Go detail Page #2 >")
                    }
                    .navigationBarTitle("Index Page #1")
                }
            }
            
    }
}

struct MyDetailView: View {
    
    let message: String

    var body: some View {
        VStack {
            Text(message)
                .font(.largeTitle)
        }
    }
}
查看运行结果

第2节：NavigationLinkAndGoBack


示例代码：
struct ContentView : View {
    
    @State private var isPresented = false
    
    var body: some View {
        
//            NavigationView{
//                VStack{
//                Image("Picture").onTapGesture {
//                    self.isPresented.toggle()
//                    print(self.isPresented)
//                }
//                NavigationLink(destination: Text("< Go back").onTapGesture {
//                    self.isPresented.toggle()
//                }, isActive: $isPresented) {
//                    Text("ddd")
//                }
//            }
        
        NavigationView{
            VStack{
                NavigationLink(destination: DetailView(preView: self), isActive: $isPresented) {
                    Image("logo").renderingMode(.original)
                    Text("Next Page >")
                }
            }
        }
    }
    
    func toggleValue()
    {
        self.isPresented.toggle()
    }
}
查看运行结果

第3节：PageNavigation


示例代码：
import SwiftUI

struct InfoModel : Hashable {
    var description : String
    var pictureName : String
}
struct ContentView : View {
    
    var messages : [InfoModel]
    
    var body: some View {
        return NavigationView{
            List{
                ForEach(messages, id: \.self) { message in
                    NavigationLink(destination: DetailView(imageName: message.pictureName)) {
                        Text(message.description)
                    }
                }
            }.navigationBarTitle("Picture List")
        }
    }
}
struct DetailView : View {
    var imageName : String
    var body: some View{
        Image(imageName)
    }
}
#if DEBUG
struct ContentView_Previews : PreviewProvider {
    static var previews: some View {
        let model1 = InfoModel(description: "A lady with a horse", pictureName: "Picture1")
        let model2 = InfoModel(description: "An African animal with a very long neck", pictureName: "Picture2")
        return ContentView(messages: [model1, model2])
    }
}
#endif
查看运行结果

第4节：ObjectBinding


示例代码：
class UserModel: ObservableObject {
    @Published var nickName: String = ""
}

struct ContentView : View {
    @ObservedObject var model = UserModel()
    @State var isPresented = false

    let dismiss = Alert.Button.default(Text("OK")) {}
    var alert: Alert {
        Alert(title: Text("Your nickname"),
             message: Text("\(self.model.nickName)"),
             dismissButton: dismiss)
    }
    
    var body: some View {
        VStack {
            TextField("Your nickname", text: $model.nickName)
            .padding()
            
            Button(action: {
                self.isPresented = true
            }) {
                Text("Show")
            }.alert(isPresented: $isPresented) { () -> Alert in
                alert
            }
        }
    }
}
查看运行结果

第5节：EnviromentObject


示例代码：
import SwiftUI

class UserModel: ObservableObject {
    @Published var nickName: String = ""
}

struct ContentView : View {
    
    @EnvironmentObject var model : UserModel
    @State var isPresented = false
    
    var body: some View {
        NavigationView {

            VStack{
                TextField("Your nickname", text: $model.nickName)
                .padding()
                
                NavigationLink(destination: DetailView()) {
                    Text("Show Detail")
                }
            }
        }
    }
}

#if DEBUG
struct ContentView_Previews : PreviewProvider {
    static var previews: some View {
        let model = UserModel()
        model.nickName = "Super man"
        return ContentView().environmentObject(model)
    }
}
#endif
查看运行结果

第6节：Show_Modal


示例代码：
struct ContentView : View {
    
    @State var isPresented = false

    var modalView: some View {
        Text("The Modal View")
            .font(.system(size: 48))
            .bold()
    }

    var body: some View {
        Button("Show Modal View") {
            self.isPresented = true
        }.sheet(isPresented: $isPresented, content: {
            self.modalView
        })
    }
}
查看运行结果

第7节：Show-Alert


示例代码：
struct ContentView : View {
    
        @State var isAlert = false

        let primaryButton = Alert.Button.default(Text("Yes")) {
            print("Yes, I'm a student.")
        }
    
        let secondaryButton = Alert.Button.destructive(Text("No")) {
            print("No, I'm not a student.")
        }
        
        var alert: Alert {
            Alert(title: Text("Question"),
                  message: Text("Are you a student?"),
                  primaryButton: primaryButton,
                  secondaryButton: secondaryButton)
        }

        var body: some View {
            VStack {
                Button("Alert Sheet") {
                    self.isAlert = true
                }
            }.alert(isPresented: $isAlert, content: {
                alert
            })

        }
    }
查看运行结果

第8节：Show-ActionSheet


示例代码：
struct ContentView : View {
    
    @State var isPresented = false

    var myActionSheet: ActionSheet {
        ActionSheet(title: Text("Information"),
            message: Text("What's your favorite?"),
            buttons: [
                .default(Text("Fishing")) {
                    print("---I like fishing")
                },
                .destructive(Text("Hunting")) {
                    print("---I like hunting")
                },
                .cancel({
                    print("---Nothing")
                })
            ]
        )
    }

    var body: some View {
        VStack {
            Button("Show action sheet") {
                self.isPresented = true
            }
        }
        .actionSheet(isPresented: $isPresented, content: {
            myActionSheet
        })
    }
}
查看运行结果

第六章 更多...

第1节：PreviewInNavigationView


示例代码：
struct ContentView : View {
    var body: some View {
        VStack{
            Image("SwiftUI")
            .navigationBarTitle("About SwiftUI")
            Text("SwiftUI is an innovative, exceptionally simple way to build user interfaces across all Apple platforms with the power of Swift. Build user interfaces for any Apple device using just one set of tools and APIs. With a declarative Swift syntax that’s easy to read and natural to write, SwiftUI works seamlessly with new Xcode design tools to keep your code and design perfectly in sync. Automatic support for Dynamic Type, Dark Mode, localization, and accessibility means your first line of SwiftUI code is already the most powerful UI code you’ve ever written.")
            .padding()
        }
    }
}
查看运行结果

第2节：Background


示例代码：
struct ContentView : View {
    
    var body: some View {
        
        VStack{
            
            Spacer()
            
            Text("SwiftUI Tutorials")
                .font(.largeTitle)
                .padding()
                .background(Color.orange)
            
            Spacer()
            
            Text("SwiftUI Tutorials")
            .font(.largeTitle)
            .padding()
            .background(Image("iPhoneSerial")
                .resizable())
            
            Spacer()
            
            Text("SwiftUI Tutorials")
                .font(.largeTitle)
                .padding()
                .background(Circle()
                    .fill(Color.orange)
                    .frame(width: 280, height: 280))
            
            Spacer()
            
        }

    }
}
查看运行结果

第3节：SizeCategory


示例代码：
struct ContentView : View {
    var body: some View {
        VStack{
            Text("Dynamic Type sizes")
                .font(.system(size: 36))
            Text("Dynamic Type sizes")
        }
        
    }
}

#if DEBUG
struct ContentView_Previews : PreviewProvider {
    static var previews: some View {
        VStack{
            
            Spacer()
            ContentView()
                .environment(\.sizeCategory, .extraSmall)
            Spacer()
            ContentView()
            Spacer()

            ContentView()
               .environment(\.sizeCategory, .accessibilityExtraExtraExtraLarge)
            
            Spacer()
        }
        
    }
}
#endif
查看运行结果

第4节：PreviewDevice


示例代码：
struct ContentView : View {
    var body: some View {
        VStack{
            Text("Dynamic Type sizes")
                .font(.system(size: 48))
            Text("Dynamic Type sizes")
        }
        
    }
}

#if DEBUG
struct ContentView_Previews : PreviewProvider {
    static var previews: some View {
        Group {
           ContentView()
              .previewDevice(PreviewDevice(rawValue: "iPhone 8"))
              .previewDisplayName("Device-8")

           ContentView()
              .previewDevice(PreviewDevice(rawValue: "iPhone XS Max"))
              .previewDisplayName("Device-XS Max")
        }
    }
}
#endif
查看运行结果

第5节：ViewAsProperties


示例代码：
struct ContentView : View {
    
    let icon = Image(systemName: "book.fill")
    let title = Text("Interactive Tutorials")
    let flag = Image(systemName: "icloud.and.arrow.down")
    
    var body: some View {
        HStack(alignment: .bottom, spacing: 40){
            icon
            title
            Spacer()
            flag
        }
        .padding()
    }
}
查看运行结果

第6节：onAppear-onDisappear


示例代码：
struct DetailView: View {
    var body: some View {
        Text("Detail")
        .onAppear {
            print("DetailView appeared!")
        }.onDisappear {
            print("DetailView disappeared!")
        }
    }
}

struct ContentView : View {
    
    @State private var isPresented = false
    
    var body: some View
    {
        Text("Show Detail > ").sheet(isPresented: $isPresented, content: {
            DetailView()
        }).onTapGesture {
            self.isPresented = true
        }.onDisappear {
            print("ContentView disappeared!")
        }.onAppear {
            print("ContentView appeared!")
        }
    }
}
查看运行结果

第7节：ColorScheme-LightAndDark


示例代码：
struct ContentView : View {
    var body: some View {
        VStack(alignment: .center, spacing: 20){
            Text("Dynamic Type sizes")
                .font(.system(size: 48))
                .foregroundColor(Color.secondary)
            Text("Dynamic Type sizes")
                .foregroundColor(Color.accentColor)
            Image(systemName: "star.fill")
                .foregroundColor(Color.secondary)
                .font(.system(size: 64))
        }
        .frame(minWidth: 0, maxWidth: .infinity, minHeight: 0, maxHeight: .infinity)
        .background(Color.primary)
        .edgesIgnoringSafeArea(.all)
        
    }
}

#if DEBUG
struct ContentView_Previews : PreviewProvider {
    static var previews: some View {
        HStack {
           ContentView()
              .environment(\.colorScheme, .light)

           ContentView()
              .environment(\.colorScheme, .dark)
        }
        
    }
}
#endif
查看运行结果

第8节：AnyView


示例代码：
struct ContentView : View {
    
    private var randomBool = Bool.random()
    
//    var body: some View {
//        Group {
//            if randomBool {
//                Text("Hi, you get the gift.")
//                    .font(.system(size: 32))
//            } else {
//                Text("Sorry, you miss the gift.")
//                    .font(.system(size: 32))
//            }
//        }
//    }
    
//    var body: some View {
//        if randomBool {
//            return Text("Hi, you get the gift.")
//                .font(.system(size: 32))
//        } else {
//            return Text("Sorry, you miss the gift.")
//                .font(.system(size: 32))
//        }
//    }
    
    var body: AnyView {
        if randomBool {
            return AnyView(Image(systemName: "star.fill").font(.system(size: 72)))
        } else {
            return AnyView(Text("Sorry, you miss the gift.").font(.system(size: 32)))
        }
    }
}
查看运行结果

第9节：NavigationBarTitle


示例代码：
struct ContentView : View {

    var body: some View {
        NavigationView {
            
//            Text("SwiftUI's NavigationView")
            
//            Text("SwiftUI's NavigationView")
//                .navigationBarTitle(Text("SwiftUI"))
            
//            Text("SwiftUI's NavigationView")
//                .navigationBarTitle(Text("SwiftUI"), displayMode: .large)
            
            Text("SwiftUI's NavigationView")
                .navigationBarTitle(Text("SwiftUI"), displayMode: .inline)
        }
    }
}
查看运行结果

第10节：NavigationItem


示例代码：
struct TrailingButtons : View{
    var body: some View {
        HStack{
            Button(action: {
                print("Download the data")
            }) {
                Image(systemName: "icloud.and.arrow.down.fill")
            }
            Button(action: {
                print("Edit the data")
            }) {
                Image(systemName: "pencil.tip.crop.circle")
            }
        }
    }
}

struct ContentView : View {

    var body: some View {
        NavigationView {
            Text("SwiftUI's NavigationView")
                .navigationBarTitle(Text("SwiftUI"))
                .navigationBarItems(leading:  Button(action: {
                       print("Go to index page")
                   }) {
                       Text("Index")
                   }, trailing: TrailingButtons())
        }
    }
}
查看运行结果

第11节：ViewModifier


示例代码：
struct ContentView : View {
    
    var body: some View {
        VStack(alignment: .center, spacing: 40){
            Image("avarta1").modifier(myImageStyle())
            Image("avarta2").modifier(myImageStyle())
            Image("avarta3").modifier(myImageStyle())
        }
        .padding()
    }
}

struct myImageStyle: ViewModifier {
    func body(content: Content) -> some View {
        content
            .frame(width: 200, height: 200, alignment: .leading)
            .cornerRadius(100)
            .clipped()
            .saturation(0.0)
    }
}
查看运行结果

SwiftUI炫酷实例的动画演示

实例代码已经被整理成互动课程(共196节课程)，已集成在Xcode互动教程中，免费下载地址：！[https://itunes.apple.com/cn/app/id1063100471]























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