iphone - 在 iPhone 4 中使用 UIViewController MediaPlayer 添加

Question

我想使用 UIViewController MediaPlayer additions在 iPhone 4 静态库中。

我的 View Controller 子类的 .h 导入 <MediaPlayer/MediaPlayer.h> 。但是，当我使用presentMoviePlayerViewControllerAnimated时在 .m 中，我收到编译器警告:

“MyViewController”可能不会响应“-presentMoviePlayerViewControllerAnimated:animated:”

我做错了什么？我该如何避免这个警告？静态库与此有什么关系吗？

当前代码:

NSURL* url = [NSURL URLWithString:urlAsString];
if ([MPMoviePlayerController instancesRespondToSelector:@selector(setFullscreen:animated:)]) {
    // iPhone 3.2 or higher  
    MyMoviePlayerViewControllerSubclass* vc = [[MyMoviePlayerViewControllerSubclass alloc] initWithContentURL:url];
    [self presentMoviePlayerViewControllerAnimated:vc animated:YES];
    [vc release];
}

Answer 1

presentMoviePlayerViewControllerAnimated:采用MPMoviePlayerViewController类型的参数。

这是一个例子:

// Initialize a movie player object with the specified URL
    MPMoviePlayerViewController *mp = [[MPMoviePlayerViewController alloc] initWithContentURL:url];

    if (mp) {
        // save the movie player object
        self.moviePlayerViewController = mp;
        [mp release];

        //Present       
        [self presentMoviePlayerViewControllerAnimated:self.moviePlayerViewController];

        // Play the movie!
        self.moviePlayerViewController.moviePlayer.movieSourceType = MPMovieSourceTypeFile;
        [self.moviePlayerViewController.moviePlayer play];
    }

其中 url 是电影的 url，self.movi​​ePlayerViewController 是 MPMoviePlayerViewController 类型的属性变量(如果需要的话)。