xcode 淡入淡出动画到uilabel
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时间：2020-09-15 00:47:54 来源:igfitidea点击:
fade in, fade out animation to uilabel
提问by user1492776
i have a label that i want to fade in and then to fade out. here is my code:
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];
}
from this code i get this situation: my label is fade in and then i don't see the fadeout animation. how can i fix it?
从这段代码我得到了这种情况：我的标签淡入，然后我看不到淡出动画。我该如何解决？
回答by mayuur
-(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];
}
回答by Jonathan Naguin
The call to setAnimationDidStopSelectorshould be before commit the animations:
调用setAnimationDidStopSelector应该在提交动画之前：
[UIView beginAnimations:nil context:nil];
[UIView setAnimationCurve:UIViewAnimationCurveEaseIn];
[UIView setAnimationDuration:2];
[UIView setAnimationDidStopSelector:@selector(animationDidStop:finished:context:)];
scoreLabel.alpha = 1;
[UIView commitAnimations];
