不要在xcode中的文档文件夹中显示电影

Question

我创建一个在文档文件夹中显示文件的应用程序.我有一个文件.mov格式,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此电影,我看到这个图像:

这是我的代码:(请指导我,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];
}

编译器给我这个按摩:

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,您需要检查文件是否存在,也可以添加默认值

-(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];
    }

}

电影完全加载后添加电影

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

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

}