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我正在尝试构建自定义容器视图控制器并尝试创建自己的动画。我首先将点击的单元格移动到屏幕中心，然后通过缩放和显示新视图进行放大。我从这个开始：

- (void)showDetailViewController:(UIView *)viewToAnimate {
    UIImageView *anImageView = [[UIImageView alloc] initWithImage:[self screenShot:_homeViewController.view]];


    CGRect windowBounds = [[UIScreen mainScreen] bounds];
    _detailViewController.view.frame = windowBounds;
    [self addChildViewController:_detailViewController];

    // get a screenshot of the old view before pushing the new view controller

    _detailViewController.view.alpha = 0.0;
    NSLog(@"center: %@", NSStringFromCGPoint(viewToAnimate.center));
    [self transitionFromViewController:_homeViewController toViewController:_detailViewController duration:0.5 options:0 animations:^{

        CGPoint windowCenter = CGPointMake(CGRectGetMidX(windowBounds), CGRectGetMidY(windowBounds));
        viewToAnimate.center = windowCenter;            
    viewToAnimate.layer.transform = CATransform3DMakeScale(2, 2, 2);

            NSLog(@"center 2 : %@", NSStringFromCGPoint(viewToAnimate.center));
        _detailViewController.view.alpha = 1.0;

    }completion:^(BOOL finished) {
        [anImageView removeFromSuperview];
    }];

    [_detailViewController didMoveToParentViewController:self];
}

我不明白的是，如果我注释掉 _detailViewController.view.alpha = 0 和 _detailViewController.view.alpha = 1，我不会得到任何动画。它只是跳转到新的 childViewController。但是有了这两行，我确实看到了动画。这是为什么？谢谢。

编辑：这就是我设置容器控制器的方式：在 ContainerViewController 的 viewDidLoad 中：

UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard_iPad" bundle:nil];
_homeViewController = [storyboard instantiateViewControllerWithIdentifier:@"HomeViewController"];
_homeViewController.homeViewControllerDelegate = self;
_detailViewController = [storyboard instantiateViewControllerWithIdentifier:@"DetailViewController"];

[self setSubViewControllers:@[ _homeViewController, _detailViewController]];

_selectedViewController.view.frame = [[UIScreen mainScreen] bounds];
[self addChildViewController:self.selectedViewController];
[self.view addSubview:_selectedViewController.view];
[self didMoveToParentViewController:self];
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1 回答 1

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在您发布的代码中，您展示了自己添加 _detailViewController 作为子视图控制器，但没有显示添加 _homeViewController 作为 self 的子视图控制器的步骤。在执行您发布的代码时，_homeViewController 是否是 self 的子项（正在运行转换的视图控制器）？它需要。

于 2012-12-07T01:58:33.787 回答