使添加动画在移动中的UIView（例如：UIButton）拥有点

1、添加定时器以及图片

@interface ViewController ()
/** 定时器 */
@property (strong, nonatomic) CADisplayLink *displayLink;
/** 图片 */
@property (strong, nonatomic) UIImage *image;
@end

2、初始化定时器以及图片

- (void)viewDidLoad {
    [super viewDidLoad];
    self.displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(handlerAction:)];
    self.displayLink.frameInterval = 60;
    self.image = [UIImage imageNamed:@"icon_hongbao"];
    [self startFlyWithEmojiImage:self.image onView:self.view];
}
- (void)startFlyWithEmojiImage:(UIImage *)image onView:(UIView *)view{
    self.image = image;
    [self.displayLink addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];
}

3、添加红包button，添加动画

- (void)handlerAction:(CADisplayLink *)displayLink{
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    [button setImage:self.image forState:UIControlStateNormal];
    button.frame = CGRectMake(0, 0, 50, 60);
    button.bounds = CGRectMake(0, 0, 50, 60);
    button.enabled = YES;
    button.userInteractionEnabled = NO;
    [button addTarget:self action:@selector(doTap:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button];
    
    CGSize viewSize = self.view.bounds.size;
    CGFloat x = arc4random_uniform(viewSize.width);
    CGFloat y = -button.frame.size.height;
    button.center = CGPointMake(x, y);

    [UIView animateWithDuration:30 animations:^{
        CGFloat toX = arc4random_uniform(viewSize.width);
        CGFloat toY = viewSize.height + button.frame.size.height * 0.5;
        button.center = CGPointMake(toX, toY);
    } completion:^(BOOL finished) {
        [button removeFromSuperview];
    }];
}

4、在移动中的 view需要通过hitTest来判断点击位置

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *t = [touches anyObject];
    CGPoint location = [t locationInView:self.view];
    for (UIButton *button in self.view.subviews)
    {
        
        if ([button.layer.presentationLayer hitTest:location])
        {
            [button removeFromSuperview];
            break;
        }
    }
}