Demo
1. You can apply animation to each view during the scroll:
2. The iOS 9 task switcher animation can be implemented in ten minutes with the support of this lib:
3. The fancy menu can also be implemented easily:
4. Vertical scroll is also supported:
Usage
Create the scroll view by:
self.scrollView = [[LTInfiniteScrollView alloc] initWithFrame:CGRectMake(0, 0, CGRectGetWidth(self.view.bounds), 200)];
[self.view addSubview:self.scrollView];
self.scrollView.dataSource = self;
[self.scrollView reloadDataWithInitialIndex: 0];Then implement LTInfiniteScrollViewDataSource protocol:
@protocol LTInfiniteScrollViewDataSource<NSObject>
- (UIView *)viewAtIndex:(NSInteger)index reusingView:(UIView *)view;
- (NSInteger)numberOfViews;
- (NSInteger)numberOfVisibleViews;
@endSample code:
- (NSInteger)numberOfViews
{
// you can set it to a very big number to mimic the infinite behavior, no performance issue here
return 9999;
}
- (NSInteger)numberOfVisibleViews
{
return 5;
}
- (UIView *)viewAtIndex:(NSInteger)index reusingView:(UIView *)view;
{
if (view) {
((UILabel *)view).text = [NSString stringWithFormat:@"%ld", index];
return view;
}
UILabel *aView = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, 64, 64)];
aView.backgroundColor = [UIColor blackColor];
aView.layer.cornerRadius = 32;
aView.layer.masksToBounds = YES;
aView.backgroundColor = [UIColor colorWithRed:0/255.0 green:175/255.0 blue:240/255.0 alpha:1];
aView.textColor = [UIColor whiteColor];
aView.textAlignment = NSTextAlignmentCenter;
aView.text = [NSString stringWithFormat:@"%ld", index];
return aView;
}LTInfiniteScrollView interface:
@interface LTInfiniteScrollView: UIView
@property (nonatomic, readonly) NSInteger currentIndex;
@property (nonatomic, weak) id<LTInfiniteScrollViewDataSource> dataSource;
@property (nonatomic, weak) id<LTInfiniteScrollViewDelegate> delegate;
@property (nonatomic) BOOL verticalScroll;
@property (nonatomic) BOOL scrollEnabled;
@property (nonatomic) BOOL pagingEnabled;
@property (nonatomic) BOOL bounces;
@property (nonatomic) UIEdgeInsets contentInset;
@property (nonatomic) NSInteger maxScrollDistance;
- (void)reloadDataWithInitialIndex:(NSInteger)initialIndex;
- (void)scrollToIndex:(NSInteger)index animated:(BOOL)animated;
- (UIView *)viewAtIndex:(NSInteger)index;
- (NSArray *)allViews;
@endIf you want to apply any animation during scrolling, implement LTInfiniteScrollViewDelegate protocol:
@protocol LTInfiniteScrollViewDelegate<NSObject>
- (void)updateView:(UIView *)view withProgress:(CGFloat)progress scrollDirection:(ScrollDirection)direction;
@endThe value of progress indicates the relative position of that view, if there are 5 visible views, the value will be ranged from -2 to 2:
| |
|-2 -1 0 1 2|
| |
You can clone the project and investigate the example for details.
the Swift version
Here's the Swift version: https://github.com/ltebean/LTInfiniteScrollView-Swift