iphone MPMoviePlayerViewController 处理网络问题（黑屏）

Question

嘿，我使用 MPMoviePlayerViewController 来显示视频。我不知道如何处理网络问题。我想在出错时关闭 MPMoviePlayerViewController 控制器。 missMoviePlayerViewControllerAnimated 方法仅在第一次有效，第二次我得到黑屏。

示例代码：

// VideoViewController.h
#import <MediaPlayer/MediaPlayer.h>
@interface VideoViewController : MPMoviePlayerViewController 
{
}
@end

// VideoViewController.m
@implementation VideoViewController
- (void)viewDidLoad
{
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(movieDidLoad:) name:MPMoviePlayerContentPreloadDidFinishNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(movieDidLoad:) name:MPMoviePlayerPlaybackDidFinishNotification object:nil];
}

-(void)movieDidLoad:(NSNotification*)notification
{
    [self dismissMoviePlayerViewControllerAnimated];
}
@end

// XController's function to call it
- (void)showVideoView
{
    VideoViewController * controller = [[VideoViewController alloc] initWithContentURL:[NSURL URLWithString:@"http://myvideos.com/movie.m4v"]];
    [self presentMoviePlayerViewControllerAnimated:controller];
    [controller.moviePlayer play];
    [controller release];
}

请告诉我如何处理网络问题。另请注意，该视频始终为全屏。

Answer 1

为什么你创建VideoViewController有什么特殊原因？如果您想自定义某些东西，那么您可以在不创建它的情况下完成所有操作，这也没关系。另一件事是，对于这两个通知，您都注册了“movieDidLoad”此方法，这将关闭您的视图。当视频准备好播放时，您的视图将因您注册了“MPMoviePlayerContentPreloadDidFinishNotification”的此方法而被关闭。此链接将为您提供更多帮助：

- (void)playbackFinished:(NSNotification*)notification {
NSNumber* reason = [[notification userInfo] objectForKey:MPMoviePlayerPlaybackDidFinishReasonUserInfoKey];
switch ([reason intValue]) {
    case MPMovieFinishReasonPlaybackEnded:
        NSLog(@"playbackFinished. Reason: Playback Ended");         
        break;
    case MPMovieFinishReasonPlaybackError:
        NSLog(@"playbackFinished. Reason: Playback Error");
        break;
        case MPMovieFinishReasonUserExited:
        NSLog(@"playbackFinished. Reason: User Exited");
        break;
    default:
        break;
}
[self.movieController setFullscreen:NO animated:YES];

}