ios - 无法使用 MPMoviePlayerController 播放视频文件

Question

视频文件是http://www.quirksmode.org/html5/videos/big_buck_bunny.mp4将它复制到应用程序包中后我无法播放它，然后运行它:怎么了？

-(void)showvideo {
    NSNotificationCenter* center = [NSNotificationCenter defaultCenter];

    [center addObserver:self selector:@selector(mPMoviePlayerLoadStateDidChangeNotification) name:MPMoviePlayerLoadStateDidChangeNotification object:nil];
    [center addObserver:self selector:@selector(readytoplay) name:MPMoviePlayerReadyForDisplayDidChangeNotification object:nil];

    NSBundle* b = NSBundle.mainBundle;
    NSString* res = [b resourcePath];
    NSString* file;
    //  file = @"sr.m4v";
//  file = @"sample_iPod.m4v";
    file = @"big_buck_bunny.mp4";
//  file = @"xxx.mp4";
    NSString* path = [res stringByAppendingPathComponent:file];
    NSFileManager* manager = [NSFileManager defaultManager];
    if ([manager fileExistsAtPath:path]) {
        NSLog(@"file exists!");
    }
    else {
        NSLog(@"file does not exist!");
    }

    NSURL* url = [NSURL URLWithString:path];
    NSLog(@"url: %@", url);

    self.movieplayer = [[MPMoviePlayerController alloc] initWithContentURL:url];
    //  self.movieplayer = [MPMoviePlayerController new];
    self.movieplayer.movieSourceType = MPMovieSourceTypeFile;

    NSLog(@"self.movieplayer: %@, loadState: %d", self.movieplayer, self.movieplayer.loadState);

    [self.movieplayer prepareToPlay];

    NSLog(@"self.movieplayer: %@, loadState: %d", self.movieplayer, self.movieplayer.loadState);
}

-(void)readytoplay {
    NSLog(@"readytoplay");

    [self.movieplayer.view setFrame:self.view.bounds];  // player's frame must match parent's
    [self.view addSubview:self.movieplayer.view];

    NSLog(@"self.movieplayer: %@", self.movieplayer);
    self.movieplayer.fullscreen = YES;
    NSLog(@"self.movieplayer: %@", self.movieplayer);
    [self.movieplayer play];
}

-(void)mPMoviePlayerLoadStateDidChangeNotification {
    NSLog(@"mPMoviePlayerLoadStateDidChangeNotification %@, loadState: %d", self.movieplayer, self.movieplayer.loadState);
}

电影播放器​​属性:

@property (nonatomic, strong) MPMoviePlayerController* movieplayer;

Answer 1

首先，您不能在运行时修改(追加、添加、删除)应用程序的包。其次，本地文件的 NSURL 必须用 fileURLWithPath 方法初始化。尝试纠正这个问题，如果它不播放，请尝试观察 MPMoviePlayerController 的 loadState 变化，以及它的 loadState 何时准备就绪播放，然后尝试播放该文件。希望这会有所帮助。

编辑对不起，我的错，你不是在运行时改变应用程序的包，只是去第二部分。而且，您可以通过调用 [[NSBundle mainBundle] URLForResource:@"file_name"withExtension:@"extension"];

来获取文件的 url