ios - 不要在 xcode 的文档文件夹中显示电影

Question

我创建了一个显示文件夹中文件的应用程序。 我有一个 .mov 格式的文件，我想从文档文件夹中显示它，但是当运行应用程序并单击播放按钮时，不显示这部电影，我看到了这张图片 :

这是我的代码:(请指导我并告诉我我的错误)

- (IBAction)Play:(id)sender
{
    NSString *documentPath = [NSSearchPathForDirectoriesInDomains(NSDocumentationDirectory, NSUserDomainMask, YES)objectAtIndex:0];
    NSString *file = [documentPath stringByAppendingPathComponent:@"xcode4-outlet.mov"];
    NSURL *url = [NSURL fileURLWithPath:file];
    _moviePlayer = [[MPMoviePlayerController alloc]initWithContentURL:url];
    [self.view addSubview:_moviePlayer.view];
    _moviePlayer.fullscreen = YES;
    _moviePlayer.shouldAutoplay = YES;
    _moviePlayer.allowsAirPlay = YES;
    [_moviePlayer play];
}

编译器也给我按摩:

movie player[9489:c07] [MPAVController] Autoplay: Likely to keep up or full buffer: 0
movie player[9489:c07] [MPAVController] Autoplay: Skipping autoplay, not enough buffered to keep up.
movie player[9489:c07] [MPAVController] Autoplay: Enabling autoplay
movie player[9489:c07] [MPCloudAssetDownloadController] Prioritization requested for media item ID: 0
movie player[9489:c07] [MPAVController] Autoplay: Enabling autoplay

Answer 1

在添加电影播放器​​之前需要检查文件是否存在，也可以添加默认

-(IBAction)Play:(id)sender
{

    NSString *documentPath = [NSSearchPathForDirectoriesInDomains(NSDocumentationDirectory, NSUserDomainMask, YES)objectAtIndex:0];
    NSString *file = [documentPath stringByAppendingPathComponent:@"xcode4-outlet.mov"];
    NSURL *url = [NSURL fileURLWithPath:file];

    BOOL fileExists = [[NSFileManager defaultManager] fileExistsAtPath:file];
    if(fileExists)
    {
        _moviePlayer = [[MPMoviePlayerController alloc]initWithContentURL:url];
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(moviePreloadDidFinish:) name:MPMoviePlayerLoadStateDidChangeNotification
                                                   object:_moviePlayer];
        _moviePlayer.shouldAutoplay=NO;
        [_moviePlayer prepareToPlay];
    }

}

在电影完全加载后添加你的电影

-(void)moviePreloadDidFinish:(NSNotification*)notification
{

   _moviePlayer.controlStyle=MPMovieControlStyleDefault;
   [self.view addSubview:_moviePlayer.view];
   [_moviePlayer play];
   [_moviePlayer setFullscreen:YES animated:YES];

}