IOS视图交换实现实例

转载：http://blog.csdn.net/linux_zkf

IOS开发中经常会要求交换两个视图，下面给出简单的以交换两个图片的实例代码

- (void) swapButtonPressed: (id) sender

{

UIView *fron = [[self.view subviews] objectAtIndex:2];

UIView *backt = [[self.view subviews] objectAtIndex:1];

CGContextRef ctx = UIGraphicsGetCurrentContext();

[UIView beginAnimations:nil context:ctx];

[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];

[UIView setAnimationDuration:2.0];

front.alpha = 0.0f;

back.alpha = 1.0f;

front.transform = CGAffineTransformMakeScale(0.25f, 0.25f);

back.transform = CGAffineTransformIdentity;

[self.view exchangeSubviewAtIndex:1 withSubviewAtIndex:2];

[UIView setAnimationDelegate:self];

[UIView commitAnimations];

}