objective-c – 淡入,淡出动画到uilabel

发布时间：2020-12-16 05:38:44 所属栏目：百科来源：网络整理

导读：我有一个标签,我想淡入然后淡出. 这是我的代码： -(void) fadein{ scoreLabel.alpha = 0; [UIView beginAnimations:nil context:nil]; [UIView setAnimationCurve:UIViewAnimationCurveEaseIn]; [UIView setAnimationDuration:2]; scoreLabel.alpha = 1; [UI

我有一个标签,我想淡入然后淡出.
这是我的代码：

-(void) fadein
{
    scoreLabel.alpha = 0;
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseIn];
    [UIView setAnimationDuration:2];
    scoreLabel.alpha = 1;
    [UIView commitAnimations];
    [UIView setAnimationDidStopSelector:@selector(animationDidStop:finished:context:)];
}



-(void)animationDidStop:(NSString *)animationID finished:(NSNumber *)finished    context:(void *)context {
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:2];
 scoreLabel.alpha = 0;
[UIView commitAnimations];
}

从这段代码我得到这种情况：我的标签淡入然后我没有看到淡出动画.
我该怎么办呢？

解决方法

-(void) fadein
{
    scoreLabel.alpha = 0;
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseIn];

    //don't forget to add delegate.....
    [UIView setAnimationDelegate:self];

    [UIView setAnimationDuration:2];
    scoreLabel.alpha = 1;

    //also call this before commit animations......
    [UIView setAnimationDidStopSelector:@selector(animationDidStop:finished:context:)];
    [UIView commitAnimations];
}



-(void)animationDidStop:(NSString *)animationID finished:(NSNumber *)finished    context:(void *)context {
{
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:2];
    scoreLabel.alpha = 0;
    [UIView commitAnimations];
}

（编辑：李大同）

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