使用翻转动画动画UIImageView

Question

我是Objective-c和cocoa中的菜鸟，我想用翻转动画实现UIImageView的简单动画。但我很难做到这一点。以下是我的摘要：

UIView *containerView = [[UIView alloc] initWithFrame:CGRectMake(0,0,33,33)];
UIImageView *img1 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:IMG1]];
UIImageView *img2 = [[UIImageView alloc] initWithImage:[UIImage imageNamed:IMG2]];                              
[containerView addSubview:img1];
[containerView addSubview:img2];
[self.view addSubview:containerView];

CGContextRef context = UIGraphicsGetCurrentContext();
[UIView beginAnimations:nil context:context];
[UIView setAnimationDuration:0.75];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:containerView cache:YES];
[containerView exchangeSubviewAtIndex:0 withSubviewAtIndex:1];
[UIView commitAnimations];

感谢。

Answer 1

您引用一个名为view的对象，它永远不会被声明。我认为您需要将倒数第二行更改为

[containerView exchangeSubviewAtIndex:0 withSubviewAtIndex:1];

看看是否有帮助。