iphone - 翻转 View 时出现问题

Question

我在翻转 View 时遇到了一些问题。我的 View Controller 中有以下代码:

- (void)loadFlipsideViewController {
    ProblemViewFlipController *viewController = [[ProblemViewFlipController alloc] initWithNibName:@"ProblemViewFlip" bundle:nil];
    self.problemViewFlipController = viewController;
    [viewController release];
}


- (void) flipView {

    if (problemViewFlipController == nil) {
        [self loadFlipsideViewController];
    }

    UIView *mainView = self.view;
    UIView *flipView = problemViewFlipController.view;

    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:1];

    [UIView setAnimationTransition:([mainView superview] ? UIViewAnimationTransitionFlipFromLeft : UIViewAnimationTransitionFlipFromRight) forView:self.view cache:YES];

    if ([flipView superview])
    {
        [flipView removeFromSuperview];
        [self.view addSubview:mainView];
    }
    else
    {
        [mainView removeFromSuperview];
        [self.view addSubview:flipView];
    }

    [UIView commitAnimations];
}

问题是，当我调用 FlipView 时， View 会被替换为空白 View (即我要翻转到的 View 中没有任何内容显示)。

我在这里遗漏了一些明显的东西吗？ (我怀疑有!)

Answer 1

不是积极的，但我认为你需要使用“ Controller ”来翻转 View 。看起来您正在使用翻转 View 之一作为 Controller 。只需添加一个根 Controller 即可翻转您的 View 。

这样的代码应该在根 Controller 上工作:

[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:1];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:self.view cache:YES]; // self.view is the root controller's view
[mainViewController viewWillAppear:YES];
[flipViewController viewWillDisappear:YES];
[flipViewController.view removeFromSuperview];
[self.view  addSubview:mainViewController.view];
[flipViewController viewDidDisappear:YES];
[mainViewController viewDidAppear:YES];
[UIView commitAnimations];