iPhone SDK 4：怪異編譯錯誤，的MPMoviePlayerController

Question

我有含有下列方法的viewController：

- (IBAction) playMovie { 
    NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"test" ofType:@"m4v"]]; 

    MPMoviePlayerController *moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:url]; 
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(moviePlayBackDidFinish:) 
             name:MPMoviePlayerPlaybackDidFinishNotification 
             object:moviePlayer]; 

    moviePlayer.controlStyle = MPMovieControlStyleNone; 
    moviePlayer.shouldAutoplay = YES; 

    [self.view addSubview:moviePlayer.view]; 
    [moviePlayer setFullscreen:YES animated:YES]; 
} 

我不能編譯，因爲錯誤的代碼：

未定義符號：

"_MPMoviePlayerPlaybackDidFinishNotification", referenced from: 
     _MPMoviePlayerPlaybackDidFinishNotification$non_lazy_ptr in AnotherViewController.o 
    (maybe you meant: _MPMoviePlayerPlaybackDidFinishNotification$non_lazy_ptr) 
    "_OBJC_CLASS_$_MPMoviePlayerController", referenced from: 
     objc-class-ref-to-MPMoviePlayerController in AnotherViewController.o 
ld: symbol(s) not found 
collect2: ld returned 1 exit status 

這條消息對我沒有意義。

我打算使用這種方法作爲視圖控制器的一部分。我是否必須爲玩家創建單獨的視圖控制器，或者情況並非如此？

我在創建此項目時使用SDK 3.1.2，但playMovie方法根據新的API規則完全重寫。當前的SDK版本是4.0.1

Answer 1

您添加了MediaPlayer.framework框架？