在写代码时，发现原来3.1.3下经常用的uiview动画结束后调用事件的方法居然不起作用了，摸索了一下，发现ios4下对uivew的animation处理已经有新的方式了，和大家分享一下：

代码功能：在myview向下移出屏幕的动画结束后，触发事件再将myview移除掉。

ios4以前的用法：

[UIView beginAnimations:@"View Remove" context:nil];

UIView setAnimationDelegate:self];

[UIView setAnimationDidStopSelector:@selector(animationFinish:animationID:finished:context:)];

[UIView setAnimationDuration:0.3f];

[UIView setAnimationCurve:UIViewAnimationCurveLinear];

myView.center = CGPointMake(myView.center.x, myView.center.y+480.0);

UIView commitAnimations];

- (void)animationFinish:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context {

if (animationID == @"View Remove") {

[myView removeFromSuperview];

}

}

Xcode的document已经明确说了setAnimationDidStopSelector ：”Use of this method is discouraged in iPhone OS 4.0 and later. You should use the block-based animation methods instead.“，看来这种方法是行不通了，反正在我的模拟器上是不行了，以下是ios4中的实现方法：

[UIView animateWithDuration:0.3 delay:0 options:UIViewAnimationOptionCurveLinear

animations:^{

settingView.center = CGPointMake(myView.center.x, myView.center.y+480.0);

}

completion:^(BOOL finished){

if (finished){

[myView removeFromSuperview];

}

}

];

看起来更加简洁方便了，但逻辑似乎没有原来好理解了。