一種方法是利用封裝了CATransition的UIView類方法來實現，這方法簡單但效果少。

//把子視圖從父視圖里刪除的動畫效果
[UIView beginAnimations:@"animation_" context:nil];
[UIView setAnimationDuration:1.25];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];

UIViewController * coming = [[UIViewController alloc] init];
UIViewController * going = [[UIViewController alloc] init];
coming.view = self.view.superview;
going.view = self.view;

[UIView setAnimationTransition:UIViewAnimationTransitionCurlUp forView:self.view.superview cache:YES];

[coming viewWillAppear:YES];
[going viewWillDisappear:YES];
[going.view removeFromSuperview];
[going viewDidDisappear:YES];
[coming viewDidAppear:YES];

[UIView commitAnimations];

[coming release];
[going release];

另一種方法是直接利用CATransition，復雜點但效果多些，可控性強，推薦.

//子視圖從父視圖里刪除的動畫效果
CATransition * animation = [CATransition animation];
[animation setRemovedOnCompletion:NO];
[animation setDuration:.25];
[animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear]];
[animation setType:kCATransitionPush];
[animation setSubtype:kCATransitionFromRight];

UIViewController * coming = [[UIViewController alloc] init];
UIViewController * going = [[UIViewController alloc] init];
coming.view = self.view.superview;
going.view = self.view;

[self.view.superview.layer addAnimation:animation forKey:@"animation_"];

[coming viewWillAppear:YES];
[going viewWillDisappear:YES];
[going.view removeFromSuperview];
[going viewDidDisappear:YES];
[coming viewDidAppear:YES];

[self.view.superview.layer removeAnimationForKey:@"animation_"];

[coming release];
[going release];

?

再傳送兩個網址，講的詳細些：

CATransition的動畫效果類型及實現方法

UIView動畫小記

總結

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