Animate UIWindow's rootViewController transitions
This is a small project used to demostrate how to implement UIWindow's rootViewController
transitions with a little piece of code.
You can found the original article for this article here.
Motivation
Sometimes during the lifecycle of an application you may need to change the rootViewController
of your main UIWindow
; a typical case maybe the transition between the initial on-boarding and the home of the app (ie. a UITabBarController
).
In order to handle this edge case you may want to create a top controller (typically an UINavigationController
with invisible navigation bar) which enable you to push your new container using a standard push animation.
While basically it works fine, the addition of a container used only to handle this single operation is a bit awful to see.
A way better solution is to apply an animated transition (push/pop or slide) to the rootViewController
set so you will get an animate switch from the current view controller to the new one.
In fact, even if not exposed, you can and its really simple to accomplish via CoreAnimation
and CATransition
.
The following code implements a new function as extension of UIWindow
class; it takes two arguments: the destination controller and options.
As you may imagine the destination controller is the controller you want to set as new rootViewController
, while options is struct used to group some typical CoreAnimation settings: the animation direction (pop/push/slide from top or bottom), the animation curve (linear, ease in/out), the duration of the animation (by default is 0.25s) and an optional UIView instance used to fade in/out between the old and new view.
Known Issue & Fix
The 1.0.0 fixes and issue with iOS currently opened as radar here. This fix was created by voltbank in his repository ReplaceRootViewController forked from this project.
โค๏ธ Your Support
Hi fellow developer!
You know, maintaing and developing tools consumes resources and time. While I enjoy making them your support is foundamental to allow me continue its development.
If you are using SwiftLocation or any other of my creations please consider the following options:
How to use it
Once implemented you can use the only function exposed to all UIWindow instances called
func set(rootViewController newRootViewController: UIViewController, options: TransitionOptions = TransitionOptions(), _ completion:((Bool) -> Void)? = nil)
where:
controller
: the destination view controller to set as newrootViewController
options
: aTransitionOptions
with the following properties:duration
: duration of the animation (expressed inTimeInterval
, seconds, default is0.25
)direction
: direction of the transition (toRight
,toLeft
,toTop
,toBottom
, default is.toRight
)style
: animation curve (linear
,easeIn
,easeOut
,easeInOut
, default is.linear
)background
: background view set for fade in-out into the old/new controller (by default isnil
).
completion
: completion callback to receive info when transition did completes.
The following code change the rootViewController
using a ease out - slide up animation of 0.4 seconds.
let wnd = UIApplication.shared.keyWindow
var options = UIWindow.TransitionOptions()
options.direction = .toTop
options.duration = 0.4
options.style = .easeOut
wnd?.set(rootViewController(newVC, options: options)
If you just need of a simple push (like UINavigationController
's push) you can call it without the options
arg:
wnd?.set(rootViewController(newVC)
Demo App
The following demo is available inside the project's demo application.
Installation
You can install UIWindowTransitions using CocoaPods, Carthage and Swift package manager
pod 'UIWindowTransitions'
CocoaPods
use_frameworks!
pod 'UIWindowTransitions'
Swift Package Manager
Add UIWindowTransitions as dependency in your Package.swift
import PackageDescription
let package = Package(name: "YourPackage",
dependencies: [
.Package(url: "https://github.com/malcommac/UIWindowTransitions.git", majorVersion: 0),
]
)
Contributing
- If you need help or you'd like to ask a general question, open an issue.
- If you found a bug, open an issue.
- If you have a feature request, open an issue.
- If you want to contribute, submit a pull request.
Copyright & Acknowledgements
UIWindowTransitions is currently owned and maintained by Daniele Margutti.
You can follow me on Twitter @danielemargutti.
My web site is https://www.danielemargutti.com
This software is licensed under MIT License.
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