MPMoviePlayerController在Cocos2D中导致约束警告

Question

我正在开发iOS中的Cocos2D游戏，并在控制台中看到很多约束相关的警告。我在SO和其他网站上阅读过许多与限制相关的帖子，但一直未能解决这个问题。

我有没有 NIB文件，并没有在这个项目中使用XCodes用户界面生成器。 Cocos2D仅使用编程创建的全屏GLView。据我可以告诉所有这些约束来自与UIView本身交互的MPMoviePlayerController。

我使用的MPMoviePlayerController集成验证码：https://github.com/cocos2d/cocos2d-iphone-extensions/blob/master/Extensions/CCVideoPlayer/iOS/CCVideoPlayerImpliOS.m

了一些细微的变化，以显示视频非全屏，并得到它编译于iOS8上：

- (void) setupViewAndPlay 
{ 
    UIWindow *keyWindow = [[UIApplication sharedApplication] keyWindow];  

    CGSize viewSize = [[CCDirector sharedDirector] viewSizeInPixels]; 

    // We want to show these animations windowed - not full screen 
    // Native resolution of the movie is 480p = 640x360 
    CGRect videoFrame = CGRectMake(0, 0, 640, 360); 
    if (viewSize.height < 768) 
    { 
     // On the iphone play at 1/2 size 
     videoFrame = CGRectMake(0, 0, 320, 180); 
    } 
    videoFrame.origin.x = (viewSize.width - videoFrame.size.width)/2.0f; 
    videoFrame.origin.y = (viewSize.height - videoFrame.size.height)/2.0f; 
    [keyWindow addSubview: [_theMovie view]]; 
    [[_theMovie view] setHidden: NO]; 
    [[_theMovie view] setFrame: videoFrame]; 
    [[_theMovie view] setCenter: keyWindow.center ]; 
    [keyWindow setAutoresizesSubviews:NO]; 
    [self updateOrientationWithOrientation: (UIDeviceOrientation)[[UIApplication sharedApplication] statusBarOrientation]]; 

    // Movie playback is asynchronous, so this method returns immediately. 
    [_theMovie play]; 
} 

这里是我看到的警告：

2014-10-01 11:32:45.360 SpaceBotAlpha[182:4484] Unable to simultaneously satisfy constraints. 
    Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) 

(
    "<NSLayoutConstraint:0x17774f20 H:|-(34)-[MPKnockoutButton:0x177db4e0](LTR) (Names: '|':_UIBackdropContentView:0x18c7e040)>", 
    "<NSLayoutConstraint:0x17774f50 H:[MPKnockoutButton:0x177db4e0]-(34)-[MPDetailSlider:0x18cb1f60](LTR)>", 
    "<NSLayoutConstraint:0x17774f80 H:[MPDetailSlider:0x18cb1f60]-(34)-[UIView:0x18cb6780](LTR)>", 
    "<NSLayoutConstraint:0x17774fb0 UIView:0x18cb6780.right == _UIBackdropView:0x18caec50.right - 34>", 
    "<NSLayoutConstraint:0x18cafac0 H:|-(0)-[_UIBackdropView:0x18caec50] (Names: '|':MPVideoPlaybackOverlayView:0x1778ad80)>", 
    "<NSLayoutConstraint:0x18cc77b0 H:[_UIBackdropView:0x18caec50]-(0)-| (Names: '|':MPVideoPlaybackOverlayView:0x1778ad80)>", 
    "<NSAutoresizingMaskLayoutConstraint:0x1776da10 h=-&- v=-&- _UIBackdropContentView:0x18c7e040.midX == _UIBackdropView:0x18caec50.midX>", 
    "<NSAutoresizingMaskLayoutConstraint:0x1776da40 h=-&- v=-&- _UIBackdropContentView:0x18c7e040.width == _UIBackdropView:0x18caec50.width>", 
    "<NSAutoresizingMaskLayoutConstraint:0x177aa050 h=-&- v=-&- MPVideoPlaybackOverlayView:0x1778ad80.width == MPVideoContainerView:0x1778b8e0.width>", 
    "<NSAutoresizingMaskLayoutConstraint:0x1775e480 h=-&- v=-&- MPVideoContainerView:0x1778b8e0.width == MPSwipableView:0x18cba6f0.width>", 
    "<NSAutoresizingMaskLayoutConstraint:0x177a8ce0 h=-&- v=-&- MPSwipableView:0x18cba6f0.width == MPMovieView:0x177c7eb0.width>", 
    "<NSAutoresizingMaskLayoutConstraint:0x17766310 h=--& v=--& H:[MPMovieView:0x177c7eb0(0)]>" 
) 

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x17774f50 H:[MPKnockoutButton:0x177db4e0]-(34)-[MPDetailSlider:0x18cb1f60](LTR)> 

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger. 
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful. 

我发现有关约束的所有帖子都假设已经使用了界面构建器。

任何线索？谢谢！

---

万一有人发现了这个帖子寻找有关旋转的信息：我发现了一些在上iOS8上的MPMoviePlayerController奇似乎自动旋转到正确的方向，如果我离开updateOrientationWithOrientation方法，是（请参阅GitHub链接），然后以90度出现所需内容。所以在iOS8上，我检测updateOrientationWithOrientation内的版本，并在iOS8上不做任何事情而退出。

Answer 1

OK，我最终被摆脱CCVideoPlayer extension，我试图破解而直接使用MPMoviePlayerController的解决了这个！当我开始做Mac时，我必须为此推出新的解决方案。

摆脱约束信息的关键是电影视图的窗口大小必须与其超视图大小相匹配。为此，我使用正确的大小和位置在代码中构造了一个UIView，并使MPMoviePlayerController的视图成为其子视图。

下面是部分代码：

_videoFrameView = [[UIView alloc] initWithFrame:frameUI]; 
[_videoFrameView setBackgroundColor:[UIColor redColor]]; 
[mainView addSubview:_videoFrameView]; 

_movie = [[MPMoviePlayerController alloc] init]; 
[_movie setRepeatMode:(MPMovieRepeatModeNone)]; 
[_movie setControlStyle:MPMovieControlStyleNone]; 
[_movie setScalingMode:MPMovieScalingModeAspectFit]; 
[_movie setMovieSourceType:(MPMovieSourceTypeStreaming)]; 
CGRect movieFrame; 
movieFrame.size = frameUI.size; 
[[_movie view] setFrame:movieFrame]; // player's frame size must match parent's 

[_videoFrameView addSubview: [_movie view]]; 
[_videoFrameView bringSubviewToFront:[_movie view]]; 

的方法更详细的膏shown in this gist。我在this other answer中显示的想法基于我的方法。

Answer 2

您是否尝试使用MPMoviePlayerViewController而不是MPMoviePlayerController？ （它适用于我:-)） 然后将translatesAutoresizingMaskIntoConstraints设置为YES。 就像这样：

 MPMoviePlayerViewController *moviePlayerViewController = [MPMoviePlayerViewController new]; 
    [moviePlayerViewController.view setTranslatesAutoresizingMaskIntoConstraints:YES]; 

我希望这对您有用..

Answer 3

我遇到了相同的约束问题。但是，sez的答案对我来说并不奏效，所以我挖得更深一些。在我的情况下，在设置视频控制器视图的帧并将其添加到超级视图之前，问题叫做[videoConroller prepareToPlay]。

我正在创建我的MPMoviePlayerController的实例，并在viewDidLoad中调用prepareToPlay，因为此时我有了url。但是，我一直在等待，直到viewDidAppear实际调整视频播放器的大小并将其添加到视图层次结构中。

在向层次结构中添加视图后，简单地将该方法调用到解决了我的问题。此外，我能够有一个框架，不匹配父视图的边界。

Answer 4

在iOS 9.1.2下面已解决的问题。此外，警告重复印刷，直到我重新启动应用程序。这些线解决了它。

moviePlayerController = [[MPMoviePlayerController alloc]initWithContentURL:videoUrl]; 
    [moviePlayerController.view setTranslatesAutoresizingMaskIntoConstraints:NO];