UIView 翻转动画不是动画

Question

我正在尝试在前视图和后视图之间翻转，就像书页一样。我运行在视图控制器中使用了以下测试代码，但没有出现动画。我只看到后视图（红色方块）静态出现 2 秒。怎么了？

  UIView *containerView = [[UIView alloc] initWithFrame:CGRectMake(0.0, 0.0, 100.0, 100.0)];
  containerView.backgroundColor = [UIColor greenColor];
  [self.view addSubview:containerView];

  UIView *backView = [[UIView alloc] initWithFrame:containerView.bounds];
  backView.backgroundColor = [UIColor redColor];
  [containerView addSubview:backView];

  UIView *frontView = [[UIView alloc] initWithFrame:containerView.bounds];
  frontView.backgroundColor = [UIColor blueColor];
  [containerView addSubview:frontView];

  [UIView transitionFromView:frontView
                      toView:backView
                    duration:2.0
                     options:UIViewAnimationOptionTransitionFlipFromRight
                      | UIViewAnimationOptionShowHideTransitionViews
                  completion:^(BOOL finished) {
                    [containerView removeFromSuperview];
                  }];

Answer 1

如果您将 frontView、backView 和 containerView 声明为 ivars：

@interface yourViewController ()
{
    UIView *backView;
    UIView *frontView;
    UIView *containerView;
}

然后将您的视图初始化代码放在 viewDidLoad:

中

UIView *containerView = [[UIView alloc] initWithFrame:CGRectMake(0.0, 0.0, 100.0, 100.0)];
containerView.backgroundColor = [UIColor greenColor];
[self.view addSubview:containerView];

UIView *backView = [[UIView alloc] initWithFrame:containerView.bounds];
backView.backgroundColor = [UIColor redColor];
[containerView addSubview:backView];

UIView *frontView = [[UIView alloc] initWithFrame:containerView.bounds];
frontView.backgroundColor = [UIColor blueColor];
[containerView addSubview:frontView];

最后将您的动画代码放在一个方法中：

- (void)flippingViewTransitionAnimation
{
    [UIView transitionFromView:frontView
                        toView:backView
                      duration:2.0
                       options:UIViewAnimationOptionTransitionFlipFromRight | UIViewAnimationOptionShowHideTransitionViews
                    completion:^(BOOL finished) {
                    [containerView removeFromSuperview];
    }];
}

然后在 viewDidAppear 中调用上述方法，您应该可以看到动画运行.

UIView 翻转动画不是动画

UIView flip animation is not animating

animation

cocoa-touch

uiview

ios