ios View 淡入淡出效果

ios View 淡入淡出效果

- (void)TheAnimation{
     
    CATransition *animation = [CATransition animation];
    animation.delegate = self;
    animation.duration = 0.7 ;  // 动画持续时间(秒)
    animation.timingFunction = UIViewAnimationCurveEaseInOut;
    animation.type = kCATransitionFade;//淡入淡出效果
     
    NSUInteger f = [[rView subviews] indexOfObject:fView];
    NSUInteger z = [[rView subviews] indexOfObject:zView];
    [rView exchangeSubviewAtIndex:z withSubviewAtIndex:f];
     
    [[rView layer] addAnimation:animation forKey:@"animation"];
     
    [self performSelector:@selector(ToUpSide) withObject:nil afterDelay:2];//2秒后执行TheAnimation
}