MPMoviePlayerController在Cocos2D中导致约束警告

Question

我正在使用Cocos2D for iOS中的游戏,并在控制台中看到许多与约束相关的警告.我已在SO和其他网站上阅读了许多与约束相关的帖子,但未能解决此问题.

我没有 NIB文件,也没有在此项目中使用过XCodes用户界面构建器.Cocos2D只使用以编程方式创建的全屏GLView.据我所知,所有这些约束来自MPMoviePlayerController与UIView本身的交互.

我正在使用此代码进行MPMoviePlayerController集成:https://github.com/cocos2d/cocos2d-iphone-extensions/blob/master/Extensions/CCVideoPlayer/iOS/CCVideoPlayerImpliOS.m

稍微改变一下,以显示视频非全屏,并让它在iOS8上编译:

- (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.

我发现的关于约束的所有帖子都假定已经使用了接口构建器.

有线索吗？谢谢!

---

以防万一有人发现这篇文章寻找关于旋转的信息:我注意到在iOS8上的一些奇怪的事情MPMoviePlayerController似乎是自动旋转到正确的方向,如果我按updateOrientationWithOrientation原样保留方法(参见GitHub链接)那么它出现在90要求的程度.所以在iOS8上我检测到updateOrientationWithOrientation中的版本并退出而不在iOS8上做任何事情.

Answer 1

我遇到了同样的限制问题.然而,sez的答案对我没有用,所以我挖了一点.在我的情况下,问题是[videoConroller prepareToPlay]在设置视频控制器视图的帧并将其添加到超级视图之前调用.

我正在创建我的MPMoviePlayerController的实例并在viewDidLoad中调用prepareToPlay,因为我此时有了url.但是,我等到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.

将视图添加到层​​次结构后,只需将该方法调用移动即可解决我的问题.此外,我能够有一个与父视图的边界不匹配的框架.

Answer 2

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

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

我希望这对你有用!