无法使用 AVPlayerViewController 显示电影

Posted 2023-02-23

【中文标题】无法使用 AVPlayerViewController 显示电影

【英文标题】：can't display movies using AVPlayerViewController

【发布时间】：2021-02-11 04:56:24

【问题描述】：

我正在尝试在我的视图启动时显示视频。但我不断收到应用程序试图在目标（我的视图控制器）上呈现一个 nil 模态视图控制器。

这是我的代码。

@property (nonatomic, retain) AVPlayerViewController *moviePlayer;

-(void) viewWillAppear:(BOOL)animated
    
    NSString *documentsDirectory31 = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    NSString *documentaryDirectory23 = [documentsDirectory31 stringByAppendingPathComponent:@"ChildOne.txt"];
    
    if([[NSFileManager defaultManager] fileExistsAtPath: documentaryDirectory23]) 
        self.user.text =[NSString stringWithContentsOfFile:documentaryDirectory23 encoding:NSUTF8StringEncoding error:NULL];
    
    self.sharingtext.hidden = YES;
    
   AVAudiosession *session = [AVAudioSession sharedInstance];
    [session setCategory:AVAudioSessionCategoryPlayback error:nil];
    [session setActive:YES error:nil];
    
    NSString *audioName = [myDictionary objectForKey:@"photoVideokey"];
    NSArray *pathsa = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectorya = [pathsa objectAtIndex:0];
    NSString *slash = [documentsDirectorya stringByAppendingPathComponent:@"/"];
    NSString *documentsDirectory1 = [slash stringByAppendingPathComponent:self.user.text];
    
    //Get a full path to the image in the documents directory.
    NSString *fullPath = [documentsDirectory1 stringByAppendingPathComponent:@"/Movie"];
    
    
  NSString *fullPatha = [fullPath stringByAppendingPathComponent:audioName];
    url = [NSURL fileURLWithPath:fullPatha];
   
    NSLog(@"fullPatha:%@",fullPatha);
  NSData *videoData = [[NSData alloc] initWithContentsOfURL:url];
    
    AVPlayerItem* playerItem = [AVPlayerItem playerItemWithURL:url];
       AVPlayer* playVideo = [[AVPlayer alloc] initWithPlayerItem:playerItem];
    
    
    self.sharingImage = [UIImage imageWithData:videoData];
    //AVPlayerViewController *playerViewController = [AVPlayerViewController new];
   
    // frame must match parent view
    [self.view insertSubview: [moviePlayer view]atIndex:4];
    if([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone)
        if([UIScreen mainScreen].bounds.size.height == 568.0)
            moviePlayer.view.frame = CGRectMake(0, 0, 320, 568);
        
        
       else if([UIScreen mainScreen].bounds.size.height == 667.0)
            moviePlayer.view.frame = CGRectMake(0, 0, 375, 667);
        
        
       else if([UIScreen mainScreen].bounds.size.height == 736.0)
            moviePlayer.view.frame = CGRectMake(0, 0, 414,736);
        
       else if([UIScreen mainScreen].bounds.size.height == 812.0)
              //11pro76*1.17, 3*1.69 OK!
           NSLog(@"THIS IS BEING CALLED 11 pro/12mini/SE2");
           moviePlayer.view.frame = CGRectMake(0, 0, self.view.frame.size.width,self.view.frame.size.height);
        
       else if([UIScreen mainScreen].bounds.size.height == 896.0)
           NSLog(@"THIS IS BEING CALLED 11");
                   //1176*1.29, 3*1.867 OK!
           moviePlayer.view.frame = CGRectMake(0, 0, self.view.frame.size.width,self.view.frame.size.height);
       
       else if([UIScreen mainScreen].bounds.size.height == 844.0)
           NSLog(@"THIS IS BEING CALLED 12/pro");
                   //1176*1.29, 3*1.867 OK!
           moviePlayer.view.frame = CGRectMake(0, 0, self.view.frame.size.width,self.view.frame.size.height);
       
       else if([UIScreen mainScreen].bounds.size.height == 926.0)
           NSLog(@"THIS IS BEING CALLED 12PROMAX");
                   //1176*1.29, 3*1.867 OK!
           moviePlayer.view.frame = CGRectMake(0, 0, self.view.frame.size.width,self.view.frame.size.height);
       
        
        
        else 
            [[moviePlayer view] setFrame:[self.view bounds]];
        
        
    
    
    moviePlayer.player = playVideo;
    [self presentViewController:moviePlayer animated:YES completion:^
        [self->moviePlayer.player play];
    ];
  

我知道该文件存在于路径中，因为当我拍摄并保存它时，我可以将它分享到 iMovie。 我不确定为什么模态视图为零。 谁能帮帮我。

【参考方案1】：

在这里我发现了代码中的错误。您已经创建了 AVPlayerController 的实例，但您忘记提供内存地址。请粘贴下面的代码，你就可以起飞了..

@property (nonatomic, retain) AVPlayerViewController *moviePlayer;


-(void) viewWillAppear:(BOOL)animated
self.moviePlayer = [[AVPlayerViewController alloc] init];

 NSString *documentsDirectory31 = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    NSString *documentaryDirectory23 = [documentsDirectory31 stringByAppendingPathComponent:@"ChildOne.txt"];
    
    if([[NSFileManager defaultManager] fileExistsAtPath: documentaryDirectory23]) 
        self.user.text =[NSString stringWithContentsOfFile:documentaryDirectory23 encoding:NSUTF8StringEncoding error:NULL];
    
    self.sharingtext.hidden = YES;
    
   AVAudioSession *session = [AVAudioSession sharedInstance];
    [session setCategory:AVAudioSessionCategoryPlayback error:nil];
    [session setActive:YES error:nil];
    
    NSString *audioName = [myDictionary objectForKey:@"photoVideokey"];
    NSArray *pathsa = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectorya = [pathsa objectAtIndex:0];
    NSString *slash = [documentsDirectorya stringByAppendingPathComponent:@"/"];
    NSString *documentsDirectory1 = [slash stringByAppendingPathComponent:self.user.text];
    
    //Get a full path to the image in the documents directory.
    NSString *fullPath = [documentsDirectory1 stringByAppendingPathComponent:@"/Movie"];
    
    
  NSString *fullPatha = [fullPath stringByAppendingPathComponent:audioName];
    url = [NSURL fileURLWithPath:fullPatha];
   
    NSLog(@"fullPatha:%@",fullPatha);
  NSData *videoData = [[NSData alloc] initWithContentsOfURL:url];
    
    AVPlayerItem* playerItem = [AVPlayerItem playerItemWithURL:url];
       AVPlayer* playVideo = [[AVPlayer alloc] initWithPlayerItem:playerItem];
    
    
    self.sharingImage = [UIImage imageWithData:videoData];
    //AVPlayerViewController *playerViewController = [AVPlayerViewController new];
   
    // frame must match parent view
    [self.view insertSubview: [moviePlayer view]atIndex:4];
    if([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone)
        if([UIScreen mainScreen].bounds.size.height == 568.0)
            moviePlayer.view.frame = CGRectMake(0, 0, 320, 568);
        
        
       else if([UIScreen mainScreen].bounds.size.height == 667.0)
            moviePlayer.view.frame = CGRectMake(0, 0, 375, 667);
        
        
       else if([UIScreen mainScreen].bounds.size.height == 736.0)
            moviePlayer.view.frame = CGRectMake(0, 0, 414,736);
        
       else if([UIScreen mainScreen].bounds.size.height == 812.0)
              //11pro76*1.17, 3*1.69 OK!
           NSLog(@"THIS IS BEING CALLED 11 pro/12mini/SE2");
           moviePlayer.view.frame = CGRectMake(0, 0, self.view.frame.size.width,self.view.frame.size.height);
        
       else if([UIScreen mainScreen].bounds.size.height == 896.0)
           NSLog(@"THIS IS BEING CALLED 11");
                   //1176*1.29, 3*1.867 OK!
           moviePlayer.view.frame = CGRectMake(0, 0, self.view.frame.size.width,self.view.frame.size.height);
       
       else if([UIScreen mainScreen].bounds.size.height == 844.0)
           NSLog(@"THIS IS BEING CALLED 12/pro");
                   //1176*1.29, 3*1.867 OK!
           moviePlayer.view.frame = CGRectMake(0, 0, self.view.frame.size.width,self.view.frame.size.height);
       
       else if([UIScreen mainScreen].bounds.size.height == 926.0)
           NSLog(@"THIS IS BEING CALLED 12PROMAX");
                   //1176*1.29, 3*1.867 OK!
           moviePlayer.view.frame = CGRectMake(0, 0, self.view.frame.size.width,self.view.frame.size.height);
       
        
        
        else 
            [[moviePlayer view] setFrame:[self.view bounds]];
        
        
    
    
    moviePlayer.player = playVideo;
    [self presentViewController:moviePlayer animated:YES completion:^
        [self->moviePlayer.player play];
    ];
  

【讨论】：

这不起作用。由于已经有一个用于 AVPlayer 的分配器，所以当我分配 moviePlayer 时，我得到了一个 Underfined 符号的错误。但是，如果我注释掉有关呈现视图控制器的部分，我已经消除了错误，但视频没有显示。我将创建一个新帖子来解决这个问题。谢谢

对不起，我的笨蛋，虽然我在 .h 中添加了#import ，但我没有将 AVKit 基础添加到项目中。