Question

我有一个UIViewController（让我们称之为Fred），它可以嵌入许多不同类型的容器（UINavigationController，UITabBarController或模态中）。弗雷德有一个按钮，当点击时，需要让弗雷德全屏。

直观地说，这意味着我想将Fred作为全屏模式呈现，但有两个问题：

Fred在视图层次结构中处于活动状态（无法显示活动的vc）
弗雷德需要出示自己？

我尝试通过创建一个Fred可以这样调用的fullscreenContainerViewController来解决这个问题：

[fullscreenContainer presentViewControllerAsFullscreen:self]

FullscreenContainerViewController的实现：

@property (nonatomic) UIViewController* proxyViewController

// Create a proxy VC to hold state of the original ViewController so that we can safely
// Remove it from it's hierarchy and then restore it after fullscreen is dismissed.
 - (void)presentViewControllerAsFullscreen:(UIViewController*)originalController
{        
    UIViewController* originalParentViewController = originalController.parentViewController;
    UIView* originalSuperview = originalController.view.superview;

    self.proxyViewController = [[UIViewController alloc] init];
    self.proxyViewController.view = [[UIView alloc] initWithFrame:originalController.view.frame];
    self.proxyViewController.view.autoresizingMask = originalController.view.autoresizingMask;

    // Detach contentController from parent
    [originalController willMoveToParentViewController:nil];
    [originalController.view removeFromSuperview];
    [originalController removeFromParentViewController];

    // Put in the proxy view controller in place of the orignalController
    [originalParentViewController addChildViewController:self.proxyViewController];
    [originalSuperview addSubview:self.proxyViewController.view];
    [self.proxyViewController didMoveToParentViewController:originalParentViewController];
    originalController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
    [self.proxyViewController presentViewController:originalController animated:YES completion:nil];
}

然后解雇：

- (void)dismissFullscreenWithCompletionHandler:(void (^)(void))completionHandler
{
    UIViewController* parentToRestoreTo = self.proxyViewController.parentViewController;
    UIView* superviewToRestoreTo = self.proxyViewController.view.superview;

    [self.proxyViewController dismissViewControllerAnimated:YES completion:^(void) {

        // Detach proxy view/controller
        [self.proxyViewController removeFromParentViewController];
        [self.proxyViewController.view removeFromSuperview];
        self.proxyViewController = nil;

        // Restore original parent relationship
        [parentToRestoreTo addChildViewController:self.contentController];
        [superviewToRestoreTo addSubview:self.contentController.view];
        [self.contentController didMoveToParentViewController:parentToRestoreTo];
        if (self.shouldRestoreStatusBar) {
            [[UIApplication sharedApplication] setStatusBarHidden:NO                       
                                                    withAnimation:UIStatusBarAnimationSlide];
        }
    }];
}

这可行，但似乎反模式可能吗？也许它会以某种微妙的方式打破？对我正在努力实现的目标有更好的方法吗？

UIViewController是否可以呈现自己？

0 个答案: