如何翻转UIImageView？ [英] How can I flip a UIImageView?

问题描述

如何翻转UIImageView？

How can I flip an UIImageView?

推荐答案

创建两个UIImageView frontImageView& backImageView

create two UIImageView frontImageView & backImageView

创建一个UIView containerView以包含UIImageView

create one UIView containerView to contain UIImageView

在开头显示frontImageView。

Show frontImageView in the beginning.

翻转后，显示backImageView

after flip, show backImageView

代码：

// before flip
frontImageView = [[UIImageView alloc] initWithImage:[UIImage 
                    imageNamed:@"test.png"]];

containerView = [[UIView alloc] initWithFrame:frontImageView.bounds];
containerView.center = CGPointMake(200,200);

[self.view addSubview:containerView];
[containerView addSubview:frontImageView];

-(IBAction)flipButtonClicked:(id)sender
{
     backImageView = [[UIImageView alloc] initWithImage:[UIImage 
                            imageNamed:@"cardback.png"]];
     backImageView.center = frontImageView.center;
     [UIView beginAnimations:nil context:NULL];
     [UIView setAnimationDuration:1.0];
     [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft 
                            forView:containerView 
                              cache:YES];
     [frontImageView removeFromSuperview];
     [containerView addSubview:backImageView];
     [UIView commitAnimations];
}

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