iOS：AVPlayerViewController 视图未删除

Posted 2023-03-13

【中文标题】iOS：AVPlayerViewController 视图未删除

【英文标题】：iOS: AVPlayerViewController view not removing

【发布时间】：2016-01-07 08:59:27

【问题描述】：

我使用AVPlayerViewController 创建了一个示例视频应用。它工作正常。但问题是在完成视频后，AVPlayerViewController 视图没有被删除。其他问题是为AVPlayerViewController 在横向模式全屏下设置纵向默认尺寸的约束。我是新来的约束。请下载项目并运行项目记录器显示约束问题。

源码项目：http://www.filedropper.com/avplayerdemos

【参考方案1】：

我发现您的代码有两个问题：

asset loadValuesAsynchronouslyForKeys:requestedKeys completionHandler: ^
    dispatch_async(
                   dispatch_get_main_queue(), ^
                       if (!asset.playable) 
                           return;
                        else 
                           [self prepareToPlayAsset: asset withRequestedKeys: requestedKeys];
                       

                       if (videoPlayerItem) 
                           [videoPlayerItem removeObserver:self forKeyPath:kkStatusKey];
                           [[NSNotificationCenter defaultCenter] removeObserver:self
                                                                           name:AVPlayerItemDidPlayToEndTimeNotification
                                                                         object: videoPlayerItem];
                       
                   );
];

上面的这段代码你添加了观察者并在之后删除。所以应该改变两个：

[asset loadValuesAsynchronouslyForKeys:requestedKeys completionHandler: ^
    dispatch_async(
                   dispatch_get_main_queue(), ^

                       if (videoPlayerItem) 
                           [videoPlayerItem removeObserver:self forKeyPath:kkStatusKey];
                           [[NSNotificationCenter defaultCenter] removeObserver:self
                                                                           name:AVPlayerItemDidPlayToEndTimeNotification
                                                                         object: videoPlayerItem];
                       


                       if (!asset.playable) 
                           return;
                        else 

                           [self prepareToPlayAsset: asset withRequestedKeys: requestedKeys];
                       



                   );
];

问题 2：

- (void)prepareToPlayAsset: (AVURLAsset *)asset withRequestedKeys: (NSArray *)requestedKeys 
     for (NSString *thisKey in requestedKeys) 
        NSError *error = nil;
        AVKeyValueStatus keyStatus = [asset statusOfValueForKey:thisKey error:&error];

        switch (keyStatus) 
            case AVKeyValueStatusUnknown:
                NSLog(@"%@ AVKeyValueStatusUnknown", thisKey);
            break;

            case AVKeyValueStatusFailed:
                NSLog(@"Error! PlayAsset failed.\nAVKey : %@.\nError: %@", thisKey, error);
                return;
            break;

            case AVKeyValueStatusLoading:
                NSLog(@"%@ AVKeyValueStatusLoading", thisKey);
            break;
            case AVKeyValueStatusCancelled:
                NSLog(@"%@ AVKeyValueStatusCancelled", thisKey);
            break;
            case AVKeyValueStatusLoaded: 

                videoPlayerItem = [AVPlayerItem playerItemWithAsset: asset];
                [videoPlayerItem addObserver:self forKeyPath: kkStatusKey options:0 context:nil];

                videoPlayer = [AVPlayer playerWithPlayerItem: videoPlayerItem];

                /**
                 * Creating the videoAdplayer through passing the avplayer object
                */
                [self createVideoPlayer: videoPlayer];

                if ([thisKey isEqualToString: @"duration"]) 

                 else if ([thisKey isEqualToString: @"tracks"]) 
                    NSLog(@"\n\n asset.tracks : %@ \n\n", asset.tracks);
                 else if ([thisKey isEqualToString: @"metadata"]) 
                    NSLog(@"\n\n assetMetadata : %@ \n\n", asset.metadata);
                
            
            break;

            default:
            break;
         
    

    if (!asset.playable) 
        return;
    

在这个循环中，只需检查一切负载，如果失败则返回。在这种情况下，有 2 个键，您这样的代码将添加两个 childviewcontroller，它将播放两个项目的播放器。所以把代码改成它：

- (void)prepareToPlayAsset: (AVURLAsset *)asset withRequestedKeys: (NSArray *)requestedKeys 
   for (NSString *thisKey in requestedKeys) 
        NSError *error = nil;
        AVKeyValueStatus keyStatus = [asset statusOfValueForKey:thisKey error:&error];

        switch (keyStatus) 
            case AVKeyValueStatusUnknown:
                NSLog(@"%@ AVKeyValueStatusUnknown", thisKey);
            break;

            case AVKeyValueStatusFailed:
                NSLog(@"Error! PlayAsset failed.\nAVKey : %@.\nError: %@", thisKey, error);
                return;
            break;

            case AVKeyValueStatusLoading:
                 NSLog(@"%@ AVKeyValueStatusLoading", thisKey);
            break;
            case AVKeyValueStatusCancelled:
                NSLog(@"%@ AVKeyValueStatusCancelled", thisKey);
            break;
            case AVKeyValueStatusLoaded: 


            
            break;

            default:
            break;
        
     

     videoPlayerItem = [AVPlayerItem playerItemWithAsset: asset];
     [videoPlayerItem addObserver:self forKeyPath: kkStatusKey options:0 context:nil];

    videoPlayer = [AVPlayer playerWithPlayerItem: videoPlayerItem];

    /**
     * Creating the videoAdplayer through passing the avplayer object
     */
     [self createVideoPlayer: videoPlayer];



    if (!asset.playable) 
        return;
    

我很确定你的演示。这样改，就可以了。

【讨论】：

谢谢哥们。它正在工作。一个疑问，如果我在 AVKeyValueStatusLoaded 中编写代码有什么问题？以及你能帮助解决约束吗？

你可以检查代码添加在 AVKeyValuStatusLoaded 你会看到问题。关于约束你可以检查这个问题：***.com/questions/17772922/…

你好兄弟@vienvu，你能帮我解决我的问题***.com/questions/43132122/… 吗？