ios – 如何链接淡入淡出动画

我有3个UILabel,我想在几秒钟后一个接一个地淡出.我的问题是这些都是一下子发生的.我试图链接动画,但我不能让它工作.我尝试了各种各样的建议,但无济于事.我知道这不可能很难.我最好想在一个动画方法中将它们捆绑在一起,因为我想在显示所有3个标签后从animationDidStop触发其他功能.任何帮助或建议？

这是我的代码：

- (void)viewDidLoad
{
    [self fadeAnimation:@"fadeAnimation" finished:YES target:lblReady];
    [self fadeAnimation:@"fadeAnimation" finished:YES target:lblSet];
    [self fadeAnimation:@"fadeAnimation" finished:YES target:lblGo];
}


- (void)fadeAnimation:(NSString *)animationID finished:(BOOL)finished target:(UIView *)target
{
    [UIView beginAnimations:nil context:nil];
    [UIView beginAnimations:animationID context:(__bridge void *)(target)];
    [UIView setAnimationDuration:2];

    [target setAlpha:0.0f];
    [UIView setAnimationDelegate:self];    
    [UIView commitAnimations];
}

[UIView animateWithDuration:2.0 animations:^ {
    lblReady.alpha = 0;
} completion:^(BOOL finished) {
    [UIView animateWithDuration:2.0 animations:^ {
        lblSet.alpha = 0;
    } completion:^(BOOL finished) {
        [UIView animateWithDuration:2.0 animations:^ {
            lblGo.alpha = 0;
        } completion:^(BOOL finished) {
            // Add your final post-animation code here
        }];
    }];
}];