UIView动画完成回调？

Question

动画完成后,我可以设置要调用的函数吗？我想淡化a UIView然后将其从中移除superView.

Answer 1

动画块在iOS4中引入.Apple建议您使用这些,并且新方法主要要求替换回调的完成块.例如:

[UIView animateWithDuration:0.5f
                      delay:0.0f
                    options:UIViewAnimationCurveEaseInOut
                 animations:^{
                   [myView setAlpha:0.0f];
                 }
                 completion:^(BOOL finished) {
                   [myView removeFromSuperview];
                 }]; 

Answer 2

是的,这很简单:

配置动画时

[UIView setAnimationDelegate:self];
[UIView setAnimationDidStopSelector:@selector(myAnimationStopped:finished:context:)];

并定义您的方法,如:

-(void)myAnimationStopped:(NSString *)animationID 
                 finished:(NSNumber *)finished
                  context:(void *)context {
   // fancy code here
}

self当然,不一定是那种方法.