MPMoviePlayerController在iOS4中不起作用

Question

我使用的是来自iOS 4 + MPMoviePlayerController的第一个答案

试着让MPMoviePlayerController上场。在模拟器(带iOS4的iPhone设备)中，我听到声音，但听不到视频。在设备(iPhone 3GS和iOS4)上，我什么也看不到。下面是我的代码：

    MPMoviePlayerController *moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:[NSURL fileURLWithPath:moviePath]];
    moviePlayer.movieControlMode = MPMovieControlModeDefault;

    if ([moviePlayer respondsToSelector:@selector(view)]) {
        moviePlayer.controlStyle = MPMovieControlStyleFullscreen;
        [moviePlayer.view setFrame:self.view.bounds];
        [self.view addSubview:moviePlayer.view];
    }

    [moviePlayer play];

你知道我做错了什么吗？

Answer 1

我刚刚在iOS4 + iPhone 4(和一个3GS)-it上测试了以下代码。乍一看，我认为代码的问题在于没有在MPMoviePlayerController实例上调用setFullscreen:animated。

- (void)willEnterFullscreen:(NSNotification*)notification {
    NSLog(@"willEnterFullscreen");
}

- (void)enteredFullscreen:(NSNotification*)notification {
    NSLog(@"enteredFullscreen");
}

- (void)willExitFullscreen:(NSNotification*)notification {
    NSLog(@"willExitFullscreen");
}

- (void)exitedFullscreen:(NSNotification*)notification {
    NSLog(@"exitedFullscreen");
    [self.movieController.view removeFromSuperview];
    self.movieController = nil;
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

- (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];
}

- (void)showMovie {
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(willEnterFullscreen:) name:MPMoviePlayerWillEnterFullscreenNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(willExitFullscreen:) name:MPMoviePlayerWillExitFullscreenNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(enteredFullscreen:) name:MPMoviePlayerDidEnterFullscreenNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(exitedFullscreen:) name:MPMoviePlayerDidExitFullscreenNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playbackFinished:) name:MPMoviePlayerPlaybackDidFinishNotification object:nil];

    NSURL* movieURL =  [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"tron" ofType:@"mov"]];
    self.movieController = [[MPMoviePlayerController alloc] initWithContentURL:movieURL];
    if ([self.movieController respondsToSelector:@selector(view)]) {
        self.movieController.view.frame = self.view.frame;
        [self.view addSubview:movieController.view];
        [self.movieController setFullscreen:YES animated:YES];
    }
    [self.movieController play];
}

// This method is set as the action for an on-screen button
- (void)movieTime:(id)sender {
    [self showMovie];
}

Answer 2

对于动态来说，view是一个属性，而不是一个方法，所以如果它没有为它合成或编写方法(即声明为@ MPMoviePlayerController )，就不能对它使用respondsToSelector:。我认为这对于UIKit中的大多数只读属性都是正确的。