如何显示 AVPictureInPictureController？

Question

我正在尝试使用最近在 IOS9 中引入的 AVPictureInPictureController 播放视频，使用以下代码：

AVPlayer *_AVPlayer = [AVPlayer playerWithURL:url];
AVPlayerLayer *_layer = [AVPlayerLayer playerLayerWithPlayer:_AVPlayer];
_layer.frame = [[UIApplication sharedApplication] delegate].window.bounds;
AVPictureInPictureController *_AVPictureInPictureController = [[AVPictureInPictureController alloc] initWithPlayerLayer:_layer];
_AVPictureInPictureController.delegate = self;

但是我怎样才能在屏幕上显示 _AVPictureInPictureController 呢？ 我试过了

[self presentViewController:_AVPictureInPictureController animated:YES completion:nil];

和

[self presentMoviePlayerViewControllerAnimated:_AVPictureInPictureController];

但它没有用）：

我也试过了

[self.view.layer addSublayer: layer];

但我只在屏幕上显示 AVPlayer，没有按钮或控件..

我曾经使用 MPMoviePlayerViewController，但由于它在 iOS 9 中被正式弃用，我不能再使用它了..

那么你能帮我展示一下_AVPictureInPictureController吗！！

提前致谢

Answer 1

当我查看有关AVPictureInPictureController 的文档以及有关AVPictureInPictureController 的Swift 中的Apple 示例代码时。没有播放器。在文档中，您需要创建一个按钮。并且您需要检查当前视频是否播放AVPictureInPictureController 或不喜欢以下内容。

您需要先设置AVAudioSessionCategoryPlayback。您需要为您的项目执行 Xcode Capabilities 视图，在 Background Modes 部分中选择 Audio and AirPlay。

在您的应用委托中，您需要设置以下代码：

  [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
  [[AVAudioSession sharedInstance] setActive: YES error: nil];

现在您需要使用以下代码使用AVPlayer 编写播放视频的代码：

- (void)viewDidLoad {
    [super viewDidLoad];

    NSString *path = [[NSBundle mainBundle] pathForResource:@"samplemovie" ofType:@"mov"];
    NSURL *url = [NSURL fileURLWithPath:path];
    self.AVPlayer = [AVPlayer playerWithURL:url];
    self.layer = [AVPlayerLayer playerLayerWithPlayer:_AVPlayer];
    //_layer.frame = [[UIApplication sharedApplication] delegate].window.bounds;

    [self.layer setFrame:CGRectMake(0, 0, self.view.frame.size.width-100, self.view.frame.size.height-72)];
    [self.layer setVideoGravity:AVLayerVideoGravityResize];
    [self.view.layer addSublayer:_layer];

    [_AVPlayer play];
    [self setupSuport];   //Here you need to check that `AVPictureInPictureController` is supported or not with another method


}


-(void)setupSuport
{
    if([AVPictureInPictureController isPictureInPictureSupported])
    {

      _AVPictureInPictureController =  [[AVPictureInPictureController alloc] initWithPlayerLayer:_layer];
        _AVPictureInPictureController.delegate = self;

    }
    else
    {        
     // not supported PIP start button desable here
    }

}

如果支持，这里是 PIP 的按钮切换代码：

-(IBAction)actionPIPStart:(UIButton*)sender
{

    if (_AVPictureInPictureController.pictureInPictureActive) {
        [_AVPictureInPictureController stopPictureInPicture];
    }
    else {
        [_AVPictureInPictureController startPictureInPicture];
    }
}

您现在可以与它的委托进行检查：

- (void)pictureInPictureController:(AVPictureInPictureController *)pictureInPictureController restoreUserInterfaceForPictureInPictureStopWithCompletionHandler:(void (^)(BOOL restored))completionHandler;
- (void)pictureInPictureControllerDidStopPictureInPicture:(AVPictureInPictureController *)pictureInPictureController;
- (void)pictureInPictureControllerDidStartPictureInPicture:(AVPictureInPictureController *)pictureInPictureController;
- (void)pictureInPictureControllerWillStopPictureInPicture:(AVPictureInPictureController *)pictureInPictureController;
- (void)pictureInPictureController:(AVPictureInPictureController *)pictureInPictureController failedToStartPictureInPictureWithError:(NSError *)error;
- (void)pictureInPictureControllerWillStartPictureInPicture:(AVPictureInPictureController *)pictureInPictureController;

注意：以上代码仅用于示例，可能是您的视频屏幕未完全填满设备屏幕。

希望这些信息对您有所帮助，并且可能是您需要解决的问题，以便更深入地阅读苹果文档。 AVPictureInPictureController

Answer 2

直接使用AVPlayerViewController即可，详情请查看https://developer.apple.com/library/ios/documentation/WindowsViews/Conceptual/AdoptingMultitaskingOniPad/QuickStartForPictureInPicture.html