iphone - UIView过渡动画不显示 subview

Question

我使用容器 View 作为两个 subview 的 super View 。我想将一个 subview “翻转”到另一个 subview 。第一个 subview 恰好是空白的，第二个 subview 是一个包含一些文本的 UILabel。

翻转正在发生，但我看不到我的 subview 。

我想将 blankLabelView 转换为 labelToTransition。有任何想法吗？谢谢!

代码:

-(void)viewDidLoad {
    CGRect labelFrame = CGRectMake(100.0, 217.0, 125.0, 34.0);

    self.labelContainerView = [[UIView alloc] initWithFrame:labelFrame];
    // If I change the background color to something other than clear
    // I can see that this view is flipping, otherwise it appears that
    // nothing happens.
    self.labelContainerView.backgroundColor = [UIColor clearColor];
    [self.someSuperview addSubview:self.labelContainerView];

    UILabel *label = [[UILabel alloc] initWithFrame:labelFrame];
    label.backgroundColor = [UIColor clearColor];
    label.lineBreakMode = UILineBreakModeWordWrap;
    label.numberOfLines = 2;
    label.textAlignment = UITextAlignmentCenter;
    self.labelToTransition = label;

    UIView *blankView = [[UIView alloc] initWithFrame:labelFrame];
    blankView.backgroundColor = [UIColor clearColor];
    self.blankLabelView = blankView;
}

-(void)viewWillAppear {
   self.labelToTransition.text = @"some text from a model object";

   [self.labelContainerView addSubview:self.blankLabelView];
}

-(void)flipViewAnimation {
    UIView *containerView = self.labelContainerView;

    [UIView transitionWithView:containerView duration:1.0 options:UIViewAnimationOptionTransitionFlipFromBottom 
                animations:^{ 
                    [self.blankLabelView removeFromSuperview];
                    [containerView addSubview:self.labelToTransition];
                }
                completion:NULL];
}

Answer 1

可能UILabel的框架设置不正确

尝试

CGRect labelFrame = CGRectMake(0, 0.0, 125.0, 34.0);

对于翻转功能，请尝试以下代码片段

-(void)LetUsFlip
{
[UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:1.0];  
    [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:flipContainerView cache:YES];

    if ([self.blankLabelView superview])
    {
        [self.blankLabelView removeFromSuperview];
        [self.labelContainerView addSubview:self.labelToTransition];
        [self.labelContainerView sendSubviewToBack:self.blankLabelView];
    }
    else
    {
        [self.labelToTransition removeFromSuperview];
        [self.labelContainerView addSubview:self.blankLabelView];
        [self.labelContainerView sendSubviewToBack:self.labelToTransition];
    }

    [UIView commitAnimations];
}