MPMoviePlayerController可以全屏退出，但顶部栏消失了 [英] MPMoviePlayerController can exit fullscreen but topbar is gone

问题描述

我正在使用 MPMoviePlayerController 在iPad上播放电影.

I am streaming a movie on the iPad using MPMoviePlayerController.

当用户将设备旋转到横向时，我将其设置为全屏.

When the user rotates the device to landscape, I animate it to fullscreen.

如果用户随后点击"退出全屏"或完成"，则电影将动画返回其小帧(自然行为)，但会-顶部栏(导航栏)不见了.另外，可见的视图也向上移动，在状态栏的后面和之外.

If the user then taps 'exit fullscreen' or 'done', the movie animates back to its small frame (native behavior), BUT-- the top bar (navigation bar) is gone. Also, the visible views have moved upwards, behind and beyond the status bar.

请注意，我没有触摸任何顶部栏.我还没有手动隐藏它.

Note that I haven't touched the top bar whatsoever. I have not manually hidden it.

我尝试通过将setNavigationBarHidden:animated发送到当前ViewController的导航控制器以及TabbarController的NavigationController来重新获得导航栏.我将其作为对MPMoviePlayerDidExitFullscreenNotification的响应(触发).没有效果.但是，如果我们旋转回纵向，它会立即返回.

I have tried regaining the navigation bar by sending setNavigationBarHidden:animated to the current viewcontroller's navigation controller, as well as to the tabbarcontroller's navigationcontroller. I put this in response to the MPMoviePlayerDidExitFullscreenNotification (it fires). No effect. If we rotate back to portrait, however, it's back instantly.

我的问题是:

• 为什么用户退出全屏显示时，顶部栏不返回?
• 我们如何找回顶部栏?

最诚挚的问候， 蒂莫

P.S.我将继续尝试此 SO帖子中所述的怪异之处.可能有关系.

P.S. I will proceed to experiment with the weirdnesses described in this SO post. Might be related.

推荐答案

我刚刚找到了一种更好的方法(从视图控制器返回时不会出现故障). 进入全屏模式时隐藏导航栏，然后在退出时再次显示它:

I just found a better way to to this (without the glitch when back from the view controller). Hiding the navigation bar when entering fullscreen and displaying it again on exit :

// In the view did load for example :
[[NSNotificationCenter defaultCenter] addObserver:self
     selector:@selector(moviePlayerWillExitFullScreen:) 
    name:MPMoviePlayerWillExitFullscreenNotification 
    object:nil];

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(moviePlayerDidEnterFullScreen:) name:MPMoviePlayerDidEnterFullscreenNotification object:nil];

// And in the ViewController put these methods :
- (void) moviePlayerWillExitFullScreen:(id)sender {
    [self.navigationController setNavigationBarHidden:NO animated:NO];
}

- (void)moviePlayerDidEnterFullScreen:(id)sender {
    [self.navigationController setNavigationBarHidden:YES animated:YES];
}

这将使动画更加流畅.

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