iphone - 无法使用 MPMoviePlayerViewController 播放视频

Question

我使用以下 ViewController.m 创建了一个新项目。当我运行该应用程序时，我可以看到一个具有预期原点/大小(38、100、250、163)的框，但它是黑色的并且没有播放视频。 Xcode 中有一个奇怪的输出:

2012-08-23 15:36:45.559 VideoTest1[11398:c07] [MPAVController] Autoplay: Disabling autoplay for pause
2012-08-23 15:36:45.560 VideoTest1[11398:c07] [MPAVController] Autoplay: Disabling autoplay
2012-08-23 15:37:18.186 VideoTest1[11398:c07] [MPAVController] Autoplay: Skipping autoplay, disabled (for current item: 1, on player: 0)

注意视频是用Videora iPhone Converter转换的，在Xcode中播放正常(所以不是视频问题)；视频的路径没问题，因为当我指定 demo-iPhone1(它不存在)时，我得到一个 nil 异常。我在模拟器和 iPhone 上试过:总是黑盒子。有任何想法吗？

#import "ViewController.h"
#import <MediaPlayer/MediaPlayer.h>  

@interface ViewController ()

@end

@implementation ViewController
- (void)moviePlaybackComplete:(NSNotification *)notification
{
    MPMoviePlayerController *moviePlayerController = [notification object];
    [[NSNotificationCenter defaultCenter] removeObserver:self
                                                    name:MPMoviePlayerPlaybackDidFinishNotification
                                                  object:moviePlayerController];

    [moviePlayerController.view removeFromSuperview];
}


- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    NSString *filepath   =   [[NSBundle mainBundle] pathForResource:@"demo-iPhone" ofType:@"mp4"];
    NSURL    *fileURL    =   [NSURL fileURLWithPath:filepath];
    MPMoviePlayerController *moviePlayerController = [[MPMoviePlayerController alloc] initWithContentURL:fileURL];
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(moviePlaybackComplete:)
                                                 name:MPMoviePlayerPlaybackDidFinishNotification
                                               object:moviePlayerController];
    [moviePlayerController.view setFrame:CGRectMake(38,
                                                    100,
                                                    250,
                                                    163)];
    [self.view addSubview:moviePlayerController.view];
    [moviePlayerController play];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}

@end

Answer 1

我刚刚用这行代码解决了一个类似的问题。播放器 Controller 现在出现并且视频播放完美:

@property (nonatomic, strong) MPMoviePlayerController *moviePlayer;
//
@synthesize moviePlayer = _moviePlayer;
//
[self.moviePlayer prepareToPlay];

修改以适应您的环境。