Question

我想用MPMoviePlayerViewController播放视频。所以在我的视图控制器中，我注册为MPMoviePlayerLoadStateDidChangeNotification的观察者。

然后我初始化MPMoviePlayerViewController：

self.mPlayerVC = [[MPMoviePlayerViewController alloc] initWithContentURL:[NSURL URLWithString:@"<videoURL>"]];

等待通知到达。我什么时候执行这段代码：

MPMoviePlayerController* playerController = notification.object;

if ([playerController loadState] & MPMovieLoadStatePlayable) {
    if (self.mPlayerVC) {
        [self presentMoviePlayerViewControllerAnimated:self.mPlayerVC];
    }
}

任何人都知道为什么这适用于iOS 5而不适用于iOS 6？感谢

Answer 1

iOS 6'MediaPlayer.framework中似乎存在一个错误。要播放视频，我在初始化MPMoviePlayerViewController后调用prepareToPlay

self.mPlayerVC = [[MPMoviePlayerViewController alloc] initWithContentURL:[NSURL URLWithString:@"<videoURL>"]];
[self.mPlayerVC.moviePlayer prepareToPlay];

现在，通知会再次显示，但是当我在为[self presentMoviePlayerViewControllerAnimated:self.mPlayerVC];调用的方法中调用MPMoviePlayerLoadStateDidChangeNotification时应用程序崩溃。

防止崩溃替换

[self presentMoviePlayerViewControllerAnimated:self.mPlayerVC];

类似

if ([self respondsToSelector:@selector(presentViewController:animated:completion:)]) {
[self presentViewController:self.mPlayerVC animated:YES completion:nil];
}
else if ([self respondsToSelector:@selector(presentModalViewController:animated:)]) {
[self presentModalViewController:self.mPlayerVC animated:YES];
}

MPMoviePlayerLoadStateDidChangeNotification适用于iOS 5，但不适用于iOS 6

1 个答案: