ios - 为什么不在一个 View 中初始化两个 MPMoviePlayerController？

Question

系统:iOS 7.0

NSFileManager *fileManager = [NSFileManager defaultManager];
NSArray *docPaths =  NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *audioPath = [[docPaths objectAtIndex:0] stringByAppendingPathComponent:@"test.mp4"];

if (YES == [fileManager fileExistsAtPath:audioPath])
{
    MPMoviePlayerController *moviePlayer = nil;

    //1
    moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL: [NSURL fileURLWithPath:audioPath]];
    [moviePlayer setScalingMode:MPMovieScalingModeAspectFit];
    [moviePlayer setControlStyle: MPMovieControlStyleEmbedded];
    [moviePlayer.view setBackgroundColor:[UIColor clearColor]];
    [moviePlayer.view setFrame: CGRectMake(20, 240, 80, 80)];
    moviePlayer.shouldAutoplay = NO;
    [moviePlayer prepareToPlay];
    self.abcd = moviePlayer;
    [self.view addSubview: moviePlayer.view];

    //2
    moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL: [NSURL fileURLWithPath:audioPath]];
    [moviePlayer setScalingMode:MPMovieScalingModeAspectFit];
    [moviePlayer setControlStyle: MPMovieControlStyleEmbedded];
    [moviePlayer.view setBackgroundColor:[UIColor clearColor]];
    [moviePlayer.view setFrame: CGRectMake(20, 40, 80, 80)];
    moviePlayer.shouldAutoplay = NO;
    [moviePlayer prepareToPlay];
    self.edf = moviePlayer;
    [self.view addSubview: moviePlayer.view];

}

当我初始化两个MPMoviePlayerControllers时，为什么只显示一个？如果我只初始化#1，没问题，如果只初始化#2，也可以，但是如果我同时初始化#1和#2，它只显示#2。为什么会这样？谢谢。

Answer 1

您能否详细说明您所说的只会“显示”一个是什么意思？您可以添加这两个 View ，但根据 Apple 的文档:

Note: Although you can create multiple MPMoviePlayerController objects and present their views in your interface, only one movie player at a time can play its movie.

来源:https://developer.apple.com/library/ios/documentation/mediaplayer/reference/MPMoviePlayerController_Class/Reference/Reference.html