MPMoviewPlayerController全屏播放旋转,底层UIViewController仅限纵向模式(不允许旋转)

Question

你好,

我有一个简单的应用程序,它包含带有两个UIViewControllers的UITabBarController.两个UIViewControllers都只是纵向(不允许旋转).一个UIViewController的UIView确实包含MPMoviePlayerController的视图,允许在该视图中播放视频,并可通过控件(MPMovieControlStyleEmbedded)使其全屏显示.代码很简单,看起来像......

__moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:[NSURL URLWithString:@"MOVIE_URL"]];
__moviePlayer.controlStyle = MPMovieControlStyleEmbedded;
__moviePlayer.view.frame = CGRectMake( 10, 10, 300, 200 );
__moviePlayer.view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
__moviePlayer.shouldAutoplay = NO;
[__moviePlayer prepareToPlay];  
[self.view addSubview:__moviePlayer.view];

...这确实很有效,除非用户切换到全屏播放,我希望允许旋转以允许横向播放.旋转不起作用,因为UITabBarController不允许它(以及两个UIViewControllers).

所以,我尝试了两种方法,但它们都没有按预期工作.

1)Subclassed UITabBarController

我添加了属性BOOL __allowRotation,如果设置为YES,我在UITabBarController的shouldAutorotateToInterfaceOrientation方法中返回YES.

我正在侦听MPMoviePlayerDidEnterFullscreenNotification和MPMoviePlayerWillExitFullscreenNotification通知,将此属性设置为YES和NO.

它确实有效,但问题是,当用户以横向结束视频播放时,底层视图不会旋转回纵向.旋转回纵向的唯一方法是使用私有API,这不是没有.

2)视图/层转换

我也尝试过监听MPMoviePlayerDidEnterFullscreenNotification和MPMoviePlayerWillExitFullscreenNotification通知.

当我收到MPMoviePlayerDidEnterFullscreenNotification时,我正在启动UIDevice方向通知以获取设备方向.我正在尝试根据当前的设备方向转换MPMoviePlayerController的视图层,但它有点免疫,因为它什么都不做.我可以分配任何转换属性,但它什么都不做.

它没有做任何不太正确的事情.当我在旋转期间应用变换时,当我从全屏切换回嵌入式视频播放时,我可以看到此变换的效果.

3)单独的UIWindow

我还没有测试过这个,但我发现MPMoviePlayerController创建单独的UIWindow用于全屏播放,应该可以通过[[UIApplication sharedApplication] windows]访问.这解释了为什么在全屏播放期间不应用转换.

但是我非常不喜欢这个解决方案,因为UIWindow无法识别,我不想使用像objectAtIndex:1这样的魔术常量,或者将转换应用到除主要部分之外的所有UIWindows等.

除了可以修改底层实现并且它将停止工作的事实.

题

所以,问题是,当底层UIView(即UIView的UIViewController)禁止旋转并仅允许纵向时,如何允许MPMoviePlayerController全屏播放仅旋转？

Answer 1

我有一个非常相似的情况.我的应用程序仅限肖像.但我需要以任何方向显示全屏视频,然后在用户退出全屏模式后返回纵向方向.

Split的方法对我不起作用,因为我想让用户以全屏和嵌入方式观看视频,并在模式之间切换,不会失去播放位置,也不会有任何暂停.

我发现了这个解决方法:

首先,我有一个根UINavigationController子类,它接收有关旋转的所有消息.

我禁止在此控制器中旋转:

- (BOOL) shouldAutorotateToInterfaceOrientation: (UIInterfaceOrientation)toInterfaceOrientation {
    return (UIInterfaceOrientationPortrait == toInterfaceOrientation);
}

我压倒了

- (id) initWithRootViewController:(UIViewController *)rootViewController; method. 

添加对设备方向修改的支持:

[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];

[[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(receivedRotate:) name: UIDeviceOrientationDidChangeNotification object: nil];

现在我有一个处理程序receivedRotate: - 尽管没有自动旋转到除肖像之外的任何方向,它捕获所有设备旋转:

- (void) receivedRotate:(NSNotification*) notify {
    if(isVideoFullscreen) {
        UIDeviceOrientation toInterfaceOrientation = [[UIDevice currentDevice] orientation];
        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDuration:0.4];
        [UIView setAnimationCurve:2];

        if(toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft){
            self.view.transform = CGAffineTransformMakeRotation(-M_PI_2);
            [[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationLandscapeLeft];
            self.view.bounds = CGRectMake(0, 0, 1024, 768);
        } else if(toInterfaceOrientation == UIInterfaceOrientationLandscapeRight) {
            self.view.transform = CGAffineTransformMakeRotation(M_PI_2);
            [[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationLandscapeRight]; 
            self.view.bounds = CGRectMake(0, 0, 1024, 768);            
        } else if(toInterfaceOrientation == UIInterfaceOrientationPortraitUpsideDown) {
            self.view.transform = CGAffineTransformMakeRotation(M_PI);
            [[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationPortraitUpsideDown];
            self.view.bounds = CGRectMake(0, 0, 768, 1024);
        } else if(toInterfaceOrientation == UIInterfaceOrientationPortrait) {
            self.view.transform = CGAffineTransformMakeRotation(0);
            [[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationPortrait];
            self.view.bounds = CGRectMake(0, 0, 768, 1024);
        }

        [UIView commitAnimations];
    }

}

我只是检查设备的旋转,并相应地旋转我的视图.

然后 - 当视频全屏时,根控制器如何知道？只需向init添加另外两个消息处理程序:

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(willEnterFullscreen:) name:MPMoviePlayerWillEnterFullscreenNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(willExitFullscreen:) name:MPMoviePlayerWillExitFullscreenNotification object:nil];

处理程序本身:

- (void) willEnterFullscreen: (NSNotification *) notify {
    isVideoFullscreen = YES;
}

- (void) willExitFullscreen: (NSNotification *) notify {
    self.view.transform = CGAffineTransformMakeRotation(0);
    [[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationPortrait];
    self.view.bounds = CGRectMake(0, 0, 768, 1024);    
    isVideoFullscreen = NO;
}

退出全屏时 - 我们恢复纵向方向.所以,这对我有用,希望它会帮助别人.

Answer 2

您可以尝试以模态方式呈现新的UIViewController(使用shouldAutorotate YES),并在发送MPMoviePlayerWillEnterFullscreenNotification时将__moviePlayer.view添加到此控制器中.当moviePlayer退出全屏时,执行相反的操作.