如何翻转UIImageView？

Question

如何翻转UIImageView？

Answer 1

创建两个UIImageView frontImageView和backImageView

创建一个UIView containerView以包含UIImageView

在开头显示frontImageView.

翻转后,显示backImageView

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];
}

Answer 2

您应该能够垂直翻转视图:

imageView.transform = CGAffineTransformMake(
    1, 0, 0, -1, 0, imageView.bounds.size.height
);

Answer 3

我编辑了Sound Blasters代码以返回UIImageView.但是,此代码不允许您同时垂直和水平翻转图像.对此的修复应该相当容易.

- (UIImageView *) flipImage:(UIImageView *)originalImage Horizontal:(BOOL)flipHorizontal {
if (flipHorizontal) {

    originalImage.transform = CGAffineTransformMake(originalImage.transform.a * -1, 0, 0, 1, originalImage.transform.tx, 0);
}else {

    originalImage.transform = CGAffineTransformMake(1, 0, 0, originalImage.transform.d * -1, 0, originalImage.transform.ty);
}    
return originalImage; }