AVPlayerView约束错误

问题描述：

我试图创建一个相对简单的应用程序，只需按下按钮时播放视频。我从AVKit使用AVPlayer似乎一切正常，但我运行该程序时收到有关约束的警告。AVPlayerView约束错误

不知道确切地说我有一个约束导致我一个问题。

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) 
(
"<NSAutoresizingMaskLayoutConstraint:0x7ffc5acdc030 h=-&- v=-&- _UIBackdropContentView:0x7ffc5adc6d10.width == _UIBackdropView:0x7ffc5adbfd80.width>", 
"<NSLayoutConstraint:0x7ffc5ad94a40 H:|-(0)-[UIView:0x7ffc5ad94e50] (Names: '|':UIView:0x7ffc5ad35c90)>", 
"<NSLayoutConstraint:0x7ffc5ad94a90 H:[UIView:0x7ffc5ad94e50]-(0)-| (Names: '|':UIView:0x7ffc5ad35c90)>", 
"<NSLayoutConstraint:0x7ffc5ad96720 H:|-(0)-[UIView:0x7ffc5ad35c90] (Names: '|':AVPlayerView:0x7ffc5ad356e0)>", 
"<NSLayoutConstraint:0x7ffc5ad96770 H:[UIView:0x7ffc5ad35c90]-(0)-| (Names: '|':AVPlayerView:0x7ffc5ad356e0)>", 
"<NSLayoutConstraint:0x7ffc5d068110 H:|-(0)-[UIView:0x7ffc5adc6890] (Names: '|':_UIBackdropContentView:0x7ffc5adc6d10)>", 
"<NSLayoutConstraint:0x7ffc5d068190 H:[UIView:0x7ffc5adc6890]-(0)-| (Names: '|':_UIBackdropContentView:0x7ffc5adc6d10)>", 
"<NSLayoutConstraint:0x7ffc5d067e80 H:|-(0)-[_UIBackdropView:0x7ffc5adbfd80] (Names: '|':UIView:0x7ffc5adbeb70)>", 
"<NSLayoutConstraint:0x7ffc5d067f00 H:[_UIBackdropView:0x7ffc5adbfd80]-(0)-| (Names: '|':UIView:0x7ffc5adbeb70)>", 
"<NSLayoutConstraint:0x7ffc5d067b30 H:|-(0)-[UIView:0x7ffc5adbeb70] (Names: '|':AVAlphaUpdatingView:0x7ffc5adbd530)>", 
"<NSLayoutConstraint:0x7ffc5d067b80 H:[UIView:0x7ffc5adbeb70]-(0)-| (Names: '|':AVAlphaUpdatingView:0x7ffc5adbd530)>", 
"<NSLayoutConstraint:0x7ffc5acd5b20 H:|-(34)-[AVButton:0x7ffc5adc76f0](LTR) (Names: '|':UIView:0x7ffc5adc6890)>", 
"<NSLayoutConstraint:0x7ffc5acdccc0 H:[AVButton:0x7ffc5adc76f0]-(15)-[UILabel:0x7ffc5ac741a0'0:00'](LTR)>", 
"<NSLayoutConstraint:0x7ffc5acdca20 H:[UILabel:0x7ffc5ac741a0'0:00']-(12)-[AVScrubber:0x7ffc5acb8ec0](LTR)>", 
"<NSLayoutConstraint:0x7ffc5acdca70 AVScrubber:0x7ffc5acb8ec0.right == UILabel:0x7ffc5adf2ed0'--:--'.left - 12>", 
"<NSLayoutConstraint:0x7ffc5acdcf00 UILabel:0x7ffc5adf2ed0'--:--'.right == AVButton:0x7ffc5adf3a70.left - 15>", 
"<NSLayoutConstraint:0x7ffc5acdcfa0 AVButton:0x7ffc5adf3a70.right == AVButton:0x7ffc5d0051d0.left - 10>", 
"<NSLayoutConstraint:0x7ffc5acdceb0 AVButton:0x7ffc5d0051d0.right == AVButton:0x7ffc5d00b190.left - 10>", 
"<NSLayoutConstraint:0x7ffc5acdd240 AVButton:0x7ffc5d00b190.right == UIView:0x7ffc5adc6890.right - 34>", 
"<NSLayoutConstraint:0x7ffc5adb15f0 H:|-(0)-[AVAlphaUpdatingView:0x7ffc5adbd530] (Names: '|':UIView:0x7ffc5ad94e50)>", 
"<NSLayoutConstraint:0x7ffc5adb8460 H:[AVAlphaUpdatingView:0x7ffc5adbd530]-(0)-| (Names: '|':UIView:0x7ffc5ad94e50)>", 
"<NSLayoutConstraint:0x7ffc5acd4c80 'UIView-Encapsulated-Layout-Width' H:[AVPlayerView:0x7ffc5ad356e0(100)]>" 
)

项目在这里https://github.com/jeffellin/VideoPlayer

答

我得到了同样的错误，我复制和粘贴后，从几个苹果的示例代码的各种片段到我的应用程序，尚未知道你不能指定相同的约束一个UI元素两次。

你可能做了同样的事情;因此，请在项目范围内搜索“AutoResizing”。无论您将playerView设置为根据其父视图，视图控制器还是媒体自动调整大小。

我看着你的应用程序的代码，我没有看到任何地方调用的特定方法。要么我忽略了它，要么你在发布这个问题后解决了问题。

AVPlayerView约束错误

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