ios - 无法同时满足在情节提要中嵌入 AVPlayerViewController 的约束警告

Question

我试图通过嵌入单独的视图控制器来完全通过情节提要设置 AVPlayerViewController。

脚步：

在 Xcode 中创建单视图应用程序。
在导航控制器中嵌入 VC。
在底部添加工具栏。（固定到 superView（前导，尾随，底部布局指南，高度（44））。
在父视图控制器中添加容器视图。（固定到超级视图（前导，尾随），顶部布局指南，工具栏顶部）。
移除容器视图自带的默认视图控制器。
从对象库中拖动 AV Player View Controller 对象。
将 Container View 的 embed segue 连接到 AV Player View Controller。

未添加代码。

这是我的故事板的样子：

查看层次结构：

一切运行良好： 但问题是： 一旦我运行它，我就会在调试器中收到这些警告：

2015-09-30 12:58:35.904 AVPlayerTest[9352:446772] 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:0x7f93259513b0 h=-&- v=-&- _UIBackdropContentView:0x7f9325860000.width == _UIBackdropView:0x7f932585e990.width>",
    "<NSLayoutConstraint:0x7f932592bc70 H:|-(14)-[UILabel:0x7f9325925590'Hi-Speed Scrubbing']   (Names: '|':_UIBackdropContentView:0x7f9325860000 )>",
    "<NSLayoutConstraint:0x7f932592bcf0 H:[UILabel:0x7f9325925590'Hi-Speed Scrubbing']-(14)-|   (Names: '|':_UIBackdropContentView:0x7f9325860000 )>",
    "<NSLayoutConstraint:0x7f932592b770 H:|-(0)-[_UIBackdropView:0x7f932585e990]   (Names: '|':UIView:0x7f932585e830 )>",
    "<NSLayoutConstraint:0x7f932592b7f0 H:[_UIBackdropView:0x7f932585e990]-(0)-|   (Names: '|':UIView:0x7f932585e830 )>",
    "<NSLayoutConstraint:0x7f932592b450 H:|-(0)-[UIView:0x7f932585e830]   (Names: '|':AVAlphaUpdatingView:0x7f932585e310 )>",
    "<NSLayoutConstraint:0x7f932592b4d0 H:[UIView:0x7f932585e830]-(0)-|   (Names: '|':AVAlphaUpdatingView:0x7f932585e310 )>",
    "<NSLayoutConstraint:0x7f932594aa10 'UIView-Encapsulated-Layout-Width' H:[AVAlphaUpdatingView:0x7f932585e310(0)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x7f932592bcf0 H:[UILabel:0x7f9325925590'Hi-Speed Scrubbing']-(14)-|   (Names: '|':_UIBackdropContentView:0x7f9325860000 )>

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.
2015-09-30 12:58:35.905 AVPlayerTest[9352:446772] 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:0x7f93259513b0 h=-&- v=-&- _UIBackdropContentView:0x7f9325860000.width == _UIBackdropView:0x7f932585e990.width>",
    "<NSLayoutConstraint:0x7f932592bdd0 H:|-(14)-[UILabel:0x7f9325929bb0'Slide your finger up to a...']   (Names: '|':_UIBackdropContentView:0x7f9325860000 )>",
    "<NSLayoutConstraint:0x7f932592be50 H:[UILabel:0x7f9325929bb0'Slide your finger up to a...']-(14)-|   (Names: '|':_UIBackdropContentView:0x7f9325860000 )>",
    "<NSLayoutConstraint:0x7f932592b770 H:|-(0)-[_UIBackdropView:0x7f932585e990]   (Names: '|':UIView:0x7f932585e830 )>",
    "<NSLayoutConstraint:0x7f932592b7f0 H:[_UIBackdropView:0x7f932585e990]-(0)-|   (Names: '|':UIView:0x7f932585e830 )>",
    "<NSLayoutConstraint:0x7f932592b450 H:|-(0)-[UIView:0x7f932585e830]   (Names: '|':AVAlphaUpdatingView:0x7f932585e310 )>",
    "<NSLayoutConstraint:0x7f932592b4d0 H:[UIView:0x7f932585e830]-(0)-|   (Names: '|':AVAlphaUpdatingView:0x7f932585e310 )>",
    "<NSLayoutConstraint:0x7f932594aa10 'UIView-Encapsulated-Layout-Width' H:[AVAlphaUpdatingView:0x7f932585e310(0)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x7f932592be50 H:[UILabel:0x7f9325929bb0'Slide your finger up to a...']-(14)-|   (Names: '|':_UIBackdropContentView:0x7f9325860000 )>

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.
2015-09-30 12:58:35.906 AVPlayerTest[9352:446772] 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:0x7f932592b5e0 V:|-(>=0)-[UIView:0x7f932585e830]   (Names: '|':AVAlphaUpdatingView:0x7f932585e310 )>",
    "<NSLayoutConstraint:0x7f932592b660 V:[UIView:0x7f932585e830]-(0)-|   (Names: '|':AVAlphaUpdatingView:0x7f932585e310 )>",
    "<NSLayoutConstraint:0x7f932592af50 V:[UIView:0x7f932585e830(44)]>",
    "<NSLayoutConstraint:0x7f9325952c30 'UIView-Encapsulated-Layout-Height' V:[AVAlphaUpdatingView:0x7f932585e310(0)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x7f932592b660 V:[UIView:0x7f932585e830]-(0)-|   (Names: '|':AVAlphaUpdatingView:0x7f932585e310 )>

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.
2015-09-30 12:58:35.907 AVPlayerTest[9352:446772] 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:0x7f93259513b0 h=-&- v=-&- _UIBackdropContentView:0x7f9325860000.width == _UIBackdropView:0x7f932585e990.width>",
    "<NSLayoutConstraint:0x7f932592ba00 H:|-(0)-[UIView:0x7f932585fbc0]   (Names: '|':_UIBackdropContentView:0x7f9325860000 )>",
    "<NSLayoutConstraint:0x7f932592ba80 H:[UIView:0x7f932585fbc0]-(0)-|   (Names: '|':_UIBackdropContentView:0x7f9325860000 )>",
    "<NSLayoutConstraint:0x7f932592b770 H:|-(0)-[_UIBackdropView:0x7f932585e990]   (Names: '|':UIView:0x7f932585e830 )>",
    "<NSLayoutConstraint:0x7f932592b7f0 H:[_UIBackdropView:0x7f932585e990]-(0)-|   (Names: '|':UIView:0x7f932585e830 )>",
    "<NSLayoutConstraint:0x7f932592b450 H:|-(0)-[UIView:0x7f932585e830]   (Names: '|':AVAlphaUpdatingView:0x7f932585e310 )>",
    "<NSLayoutConstraint:0x7f932592b4d0 H:[UIView:0x7f932585e830]-(0)-|   (Names: '|':AVAlphaUpdatingView:0x7f932585e310 )>",
    "<NSLayoutConstraint:0x7f932582a040 H:|-(14)-[AVButton:0x7f93258609b0](LTR)   (Names: '|':UIView:0x7f932585fbc0 )>",
    "<NSLayoutConstraint:0x7f9325829f90 H:[AVButton:0x7f93258609b0]-(15)-[UILabel:0x7f932347dc20'--:--'](LTR)>",
    "<NSLayoutConstraint:0x7f9325839550 H:[UILabel:0x7f932347dc20'--:--']-(12)-[AVScrubber:0x7f93234a4350](LTR)>",
    "<NSLayoutConstraint:0x7f932585a2f0 AVScrubber:0x7f93234a4350.right == UILabel:0x7f932583a470'--:--'.left - 12>",
    "<NSLayoutConstraint:0x7f932580b390 UILabel:0x7f932583a470'--:--'.right == AVButton:0x7f932585e480.left - 15>",
    "<NSLayoutConstraint:0x7f932586f490 AVButton:0x7f932585e480.right == AVButton:0x7f93234d1790.left - 10>",
    "<NSLayoutConstraint:0x7f932580b340 AVButton:0x7f93234d1790.right == AVButton:0x7f93234d6540.left - 10>",
    "<NSLayoutConstraint:0x7f932584c870 AVButton:0x7f93234d6540.right == UIView:0x7f932585fbc0.right - 14>",
    "<NSLayoutConstraint:0x7f932594aa10 'UIView-Encapsulated-Layout-Width' H:[AVAlphaUpdatingView:0x7f932585e310(0)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x7f9325829f90 H:[AVButton:0x7f93258609b0]-(15)-[UILabel:0x7f932347dc20'--:--'](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.
2015-09-30 12:58:35.909 AVPlayerTest[9352:446772] 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:0x7f93259513b0 h=-&- v=-&- _UIBackdropContentView:0x7f9325860000.width == _UIBackdropView:0x7f932585e990.width>",
    "<NSLayoutConstraint:0x7f932592ba00 H:|-(0)-[UIView:0x7f932585fbc0]   (Names: '|':_UIBackdropContentView:0x7f9325860000 )>",
    "<NSLayoutConstraint:0x7f932592ba80 H:[UIView:0x7f932585fbc0]-(0)-|   (Names: '|':_UIBackdropContentView:0x7f9325860000 )>",
    "<NSLayoutConstraint:0x7f932592b770 H:|-(0)-[_UIBackdropView:0x7f932585e990]   (Names: '|':UIView:0x7f932585e830 )>",
    "<NSLayoutConstraint:0x7f932592b7f0 H:[_UIBackdropView:0x7f932585e990]-(0)-|   (Names: '|':UIView:0x7f932585e830 )>",
    "<NSLayoutConstraint:0x7f932592b450 H:|-(0)-[UIView:0x7f932585e830]   (Names: '|':AVAlphaUpdatingView:0x7f932585e310 )>",
    "<NSLayoutConstraint:0x7f932592b4d0 H:[UIView:0x7f932585e830]-(0)-|   (Names: '|':AVAlphaUpdatingView:0x7f932585e310 )>",
    "<NSLayoutConstraint:0x7f932582a040 H:|-(14)-[AVButton:0x7f93258609b0](LTR)   (Names: '|':UIView:0x7f932585fbc0 )>",
    "<NSLayoutConstraint:0x7f932586f490 AVButton:0x7f932585e480.right == AVButton:0x7f93234d1790.left - 10>",
    "<NSLayoutConstraint:0x7f932580b340 AVButton:0x7f93234d1790.right == AVButton:0x7f93234d6540.left - 10>",
    "<NSLayoutConstraint:0x7f932584c870 AVButton:0x7f93234d6540.right == UIView:0x7f932585fbc0.right - 14>",
    "<NSLayoutConstraint:0x7f9325859740 H:[AVButton:0x7f93258609b0]-(>=15)-[UILabel:0x7f93234e53f0'Live Broadcast'](LTR)>",
    "<NSLayoutConstraint:0x7f932583bea0 UILabel:0x7f93234e53f0'Live Broadcast'.right <= AVButton:0x7f932585e480.left - 15>",
    "<NSLayoutConstraint:0x7f932594aa10 'UIView-Encapsulated-Layout-Width' H:[AVAlphaUpdatingView:0x7f932585e310(0)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x7f9325859740 H:[AVButton:0x7f93258609b0]-(>=15)-[UILabel:0x7f93234e53f0'Live Broadcast'](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.
2015-09-30 12:58:35.910 AVPlayerTest[9352:446772] 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:0x7f93259513b0 h=-&- v=-&- _UIBackdropContentView:0x7f9325860000.width == _UIBackdropView:0x7f932585e990.width>",
    "<NSLayoutConstraint:0x7f9323520650 H:|-(0)-[UIActivityIndicatorView:0x7f93234e6ee0]   (Names: '|':UIView:0x7f93234e6120 )>",
    "<NSLayoutConstraint:0x7f93235206a0 H:[UIActivityIndicatorView:0x7f93234e6ee0]-(10)-[UILabel:0x7f93235203b0'Loading\U2026']>",
    "<NSLayoutConstraint:0x7f9323520740 H:[UILabel:0x7f93235203b0'Loading\U2026']-(0)-|   (Names: '|':UIView:0x7f93234e6120 )>",
    "<NSLayoutConstraint:0x7f9323521f90 H:|-(>=0)-[UIView:0x7f93234e6120]   (Names: '|':AVLoadingIndicatorView:0x7f93234e5fb0 )>",
    "<NSLayoutConstraint:0x7f9323510da0 UIView:0x7f93234e6120.centerX == AVLoadingIndicatorView:0x7f93234e5fb0.centerX>",
    "<NSLayoutConstraint:0x7f932592ba00 H:|-(0)-[UIView:0x7f932585fbc0]   (Names: '|':_UIBackdropContentView:0x7f9325860000 )>",
    "<NSLayoutConstraint:0x7f932592ba80 H:[UIView:0x7f932585fbc0]-(0)-|   (Names: '|':_UIBackdropContentView:0x7f9325860000 )>",
    "<NSLayoutConstraint:0x7f932592b770 H:|-(0)-[_UIBackdropView:0x7f932585e990]   (Names: '|':UIView:0x7f932585e830 )>",
    "<NSLayoutConstraint:0x7f932592b7f0 H:[_UIBackdropView:0x7f932585e990]-(0)-|   (Names: '|':UIView:0x7f932585e830 )>",
    "<NSLayoutConstraint:0x7f932592b450 H:|-(0)-[UIView:0x7f932585e830]   (Names: '|':AVAlphaUpdatingView:0x7f932585e310 )>",
    "<NSLayoutConstraint:0x7f932592b4d0 H:[UIView:0x7f932585e830]-(0)-|   (Names: '|':AVAlphaUpdatingView:0x7f932585e310 )>",
    "<NSLayoutConstraint:0x7f932582a040 H:|-(14)-[AVButton:0x7f93258609b0](LTR)   (Names: '|':UIView:0x7f932585fbc0 )>",
    "<NSLayoutConstraint:0x7f932586f490 AVButton:0x7f932585e480.right == AVButton:0x7f93234d1790.left - 10>",
    "<NSLayoutConstraint:0x7f932580b340 AVButton:0x7f93234d1790.right == AVButton:0x7f93234d6540.left - 10>",
    "<NSLayoutConstraint:0x7f932584c870 AVButton:0x7f93234d6540.right == UIView:0x7f932585fbc0.right - 14>",
    "<NSLayoutConstraint:0x7f932583bbc0 H:[AVButton:0x7f93258609b0]-(>=15)-[AVLoadingIndicatorView:0x7f93234e5fb0](LTR)>",
    "<NSLayoutConstraint:0x7f932583bc10 AVLoadingIndicatorView:0x7f93234e5fb0.right <= AVButton:0x7f932585e480.left - 15>",
    "<NSLayoutConstraint:0x7f932594aa10 'UIView-Encapsulated-Layout-Width' H:[AVAlphaUpdatingView:0x7f932585e310(0)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x7f93235206a0 H:[UIActivityIndicatorView:0x7f93234e6ee0]-(10)-[UILabel:0x7f93235203b0'Loading…']>

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.
2015-09-30 12:58:35.912 AVPlayerTest[9352:446772] 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:0x7f93259513b0 h=-&- v=-&- _UIBackdropContentView:0x7f9325860000.width == _UIBackdropView:0x7f932585e990.width>",
    "<NSLayoutConstraint:0x7f9323521f90 H:|-(>=0)-[UIView:0x7f93234e6120]   (Names: '|':AVLoadingIndicatorView:0x7f93234e5fb0 )>",
    "<NSLayoutConstraint:0x7f9323510da0 UIView:0x7f93234e6120.centerX == AVLoadingIndicatorView:0x7f93234e5fb0.centerX>",
    "<NSLayoutConstraint:0x7f932592ba00 H:|-(0)-[UIView:0x7f932585fbc0]   (Names: '|':_UIBackdropContentView:0x7f9325860000 )>",
    "<NSLayoutConstraint:0x7f932592ba80 H:[UIView:0x7f932585fbc0]-(0)-|   (Names: '|':_UIBackdropContentView:0x7f9325860000 )>",
    "<NSLayoutConstraint:0x7f932592b770 H:|-(0)-[_UIBackdropView:0x7f932585e990]   (Names: '|':UIView:0x7f932585e830 )>",
    "<NSLayoutConstraint:0x7f932592b7f0 H:[_UIBackdropView:0x7f932585e990]-(0)-|   (Names: '|':UIView:0x7f932585e830 )>",
    "<NSLayoutConstraint:0x7f932592b450 H:|-(0)-[UIView:0x7f932585e830]   (Names: '|':AVAlphaUpdatingView:0x7f932585e310 )>",
    "<NSLayoutConstraint:0x7f932592b4d0 H:[UIView:0x7f932585e830]-(0)-|   (Names: '|':AVAlphaUpdatingView:0x7f932585e310 )>",
    "<NSLayoutConstraint:0x7f932582a040 H:|-(14)-[AVButton:0x7f93258609b0](LTR)   (Names: '|':UIView:0x7f932585fbc0 )>",
    "<NSLayoutConstraint:0x7f932586f490 AVButton:0x7f932585e480.right == AVButton:0x7f93234d1790.left - 10>",
    "<NSLayoutConstraint:0x7f932580b340 AVButton:0x7f93234d1790.right == AVButton:0x7f93234d6540.left - 10>",
    "<NSLayoutConstraint:0x7f932584c870 AVButton:0x7f93234d6540.right == UIView:0x7f932585fbc0.right - 14>",
    "<NSLayoutConstraint:0x7f932583bbc0 H:[AVButton:0x7f93258609b0]-(>=15)-[AVLoadingIndicatorView:0x7f93234e5fb0](LTR)>",
    "<NSLayoutConstraint:0x7f932583bc10 AVLoadingIndicatorView:0x7f93234e5fb0.right <= AVButton:0x7f932585e480.left - 15>",
    "<NSLayoutConstraint:0x7f932594aa10 'UIView-Encapsulated-Layout-Width' H:[AVAlphaUpdatingView:0x7f932585e310(0)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x7f9323510da0 UIView:0x7f93234e6120.centerX == AVLoadingIndicatorView:0x7f93234e5fb0.centerX>

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.
2015-09-30 12:58:35.912 AVPlayerTest[9352:446772] 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:0x7f93259513b0 h=-&- v=-&- _UIBackdropContentView:0x7f9325860000.width == _UIBackdropView:0x7f932585e990.width>",
    "<NSLayoutConstraint:0x7f9323521f90 H:|-(>=0)-[UIView:0x7f93234e6120]   (Names: '|':AVLoadingIndicatorView:0x7f93234e5fb0 )>",
    "<NSLayoutConstraint:0x7f9323510d10 H:[UIView:0x7f93234e6120]-(>=0)-|   (Names: '|':AVLoadingIndicatorView:0x7f93234e5fb0 )>",
    "<NSLayoutConstraint:0x7f932592ba00 H:|-(0)-[UIView:0x7f932585fbc0]   (Names: '|':_UIBackdropContentView:0x7f9325860000 )>",
    "<NSLayoutConstraint:0x7f932592ba80 H:[UIView:0x7f932585fbc0]-(0)-|   (Names: '|':_UIBackdropContentView:0x7f9325860000 )>",
    "<NSLayoutConstraint:0x7f932592b770 H:|-(0)-[_UIBackdropView:0x7f932585e990]   (Names: '|':UIView:0x7f932585e830 )>",
    "<NSLayoutConstraint:0x7f932592b7f0 H:[_UIBackdropView:0x7f932585e990]-(0)-|   (Names: '|':UIView:0x7f932585e830 )>",
    "<NSLayoutConstraint:0x7f932592b450 H:|-(0)-[UIView:0x7f932585e830]   (Names: '|':AVAlphaUpdatingView:0x7f932585e310 )>",
    "<NSLayoutConstraint:0x7f932592b4d0 H:[UIView:0x7f932585e830]-(0)-|   (Names: '|':AVAlphaUpdatingView:0x7f932585e310 )>",
    "<NSLayoutConstraint:0x7f932582a040 H:|-(14)-[AVButton:0x7f93258609b0](LTR)   (Names: '|':UIView:0x7f932585fbc0 )>",
    "<NSLayoutConstraint:0x7f932586f490 AVButton:0x7f932585e480.right == AVButton:0x7f93234d1790.left - 10>",
    "<NSLayoutConstraint:0x7f932580b340 AVButton:0x7f93234d1790.right == AVButton:0x7f93234d6540.left - 10>",
    "<NSLayoutConstraint:0x7f932584c870 AVButton:0x7f93234d6540.right == UIView:0x7f932585fbc0.right - 14>",
    "<NSLayoutConstraint:0x7f932583bbc0 H:[AVButton:0x7f93258609b0]-(>=15)-[AVLoadingIndicatorView:0x7f93234e5fb0](LTR)>",
    "<NSLayoutConstraint:0x7f932583bc10 AVLoadingIndicatorView:0x7f93234e5fb0.right <= AVButton:0x7f932585e480.left - 15>",
    "<NSLayoutConstraint:0x7f932594aa10 'UIView-Encapsulated-Layout-Width' H:[AVAlphaUpdatingView:0x7f932585e310(0)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x7f9323510d10 H:[UIView:0x7f93234e6120]-(>=0)-|   (Names: '|':AVLoadingIndicatorView:0x7f93234e5fb0 )>

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.
2015-09-30 12:58:35.913 AVPlayerTest[9352:446772] 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:0x7f93259513b0 h=-&- v=-&- _UIBackdropContentView:0x7f9325860000.width == _UIBackdropView:0x7f932585e990.width>",
    "<NSLayoutConstraint:0x7f932592ba00 H:|-(0)-[UIView:0x7f932585fbc0]   (Names: '|':_UIBackdropContentView:0x7f9325860000 )>",
    "<NSLayoutConstraint:0x7f932592ba80 H:[UIView:0x7f932585fbc0]-(0)-|   (Names: '|':_UIBackdropContentView:0x7f9325860000 )>",
    "<NSLayoutConstraint:0x7f932592b770 H:|-(0)-[_UIBackdropView:0x7f932585e990]   (Names: '|':UIView:0x7f932585e830 )>",
    "<NSLayoutConstraint:0x7f932592b7f0 H:[_UIBackdropView:0x7f932585e990]-(0)-|   (Names: '|':UIView:0x7f932585e830 )>",
    "<NSLayoutConstraint:0x7f932592b450 H:|-(0)-[UIView:0x7f932585e830]   (Names: '|':AVAlphaUpdatingView:0x7f932585e310 )>",
    "<NSLayoutConstraint:0x7f932592b4d0 H:[UIView:0x7f932585e830]-(0)-|   (Names: '|':AVAlphaUpdatingView:0x7f932585e310 )>",
    "<NSLayoutConstraint:0x7f932582a040 H:|-(14)-[AVButton:0x7f93258609b0](LTR)   (Names: '|':UIView:0x7f932585fbc0 )>",
    "<NSLayoutConstraint:0x7f932586f490 AVButton:0x7f932585e480.right == AVButton:0x7f93234d1790.left - 10>",
    "<NSLayoutConstraint:0x7f932580b340 AVButton:0x7f93234d1790.right == AVButton:0x7f93234d6540.left - 10>",
    "<NSLayoutConstraint:0x7f932584c870 AVButton:0x7f93234d6540.right == UIView:0x7f932585fbc0.right - 14>",
    "<NSLayoutConstraint:0x7f932583bbc0 H:[AVButton:0x7f93258609b0]-(>=15)-[AVLoadingIndicatorView:0x7f93234e5fb0](LTR)>",
    "<NSLayoutConstraint:0x7f932583bc10 AVLoadingIndicatorView:0x7f93234e5fb0.right <= AVButton:0x7f932585e480.left - 15>",
    "<NSLayoutConstraint:0x7f932594aa10 'UIView-Encapsulated-Layout-Width' H:[AVAlphaUpdatingView:0x7f932585e310(0)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x7f932583bbc0 H:[AVButton:0x7f93258609b0]-(>=15)-[AVLoadingIndicatorView:0x7f93234e5fb0](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.

对不起，很长的日志，但所有这些都是一次出现的，所以包括它。我错过了什么？自动布局工作得很好。即使在旋转。为什么我会看到这些警告？

添加了示例项目

PS：使用 Xcode 7.0 版

更新

Shows Playback Controls在属性检查器中取消选中AVPlayerViewController以某种方式修复它，我看不到任何警告。但我需要控制。似乎越来越像一个错误。

score 28 · Accepted Answer

事实上，我认为这是苹果方面的错误。

我找到了一种解决方法：在设置 AVPlayerViewController.player 后将 showPlaybackControls 设置为 YES。

我用以下几行修改了您的示例，并且不再出现约束错误：

@interface ViewController ()

@property(weak, nonatomic) AVPlayerViewController * playerViewController;


@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    NSString *path = [[NSBundle mainBundle] pathForResource:@"test" ofType:@"mp4"];
    NSURL *url = [[NSURL alloc] initFileURLWithPath: path];
    AVPlayer * player = [AVPlayer playerWithURL:url];

    self.playerViewController.player = player;
    self.playerViewController.showsPlaybackControls = YES;
}


- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    if ([segue.identifier isEqualToString:@"AVPlayerSegue"]) {
        self.playerViewController = segue.destinationViewController;
    }
}


@end

请注意，该文件test.mp4已添加到项目中。

score 1 · Accepted Answer

我下载了您的代码并查看了它。你没有做错任何事。您可以取消选中“显示播放控制”这一事实似乎表明问题出在 AVKit 框架上。我什至尝试在 XIB 文件中将值设置为 false，然后[self setShowsPlaybackControls:YES];以viewDidAppear:相同的结果调用。这绝对是一个 Apple 错误，您应该提出错误报告。

score 1 · Accepted Answer

不幸的是，这个错误仍然存在于 ios 10.1 中。无论如何，我观察到，如果我将 seekTime 设置为 0 的视图控制器，则该错误不存在。所以，我的解决方案是暂停播放器，保留当前时间，将播放器搜索到 0，呈现控制器并在完成时执行以下操作：搜索到保留的时间并再次播放。

AVPlayer *player;
AVPlayerViewController *avPlayerController;
CMTime currentTime;

- (void)viewDidLoad {
    [super viewDidLoad];

    NSURL *videoURL = [NSURL URLWithString:@"https://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4"];
    player = [AVPlayer playerWithURL:videoURL];
    AVPlayerLayer *playerLayer = [AVPlayerLayer playerLayerWithPlayer:player];
    [self.playerView.layer addSublayer:playerLayer];
    playerLayer.frame = self.playerView.bounds;
    avPlayerController = [[AVPlayerViewController alloc] init];
    avPlayerController.player = player;

}

- (IBAction)fullScreen:(id)sender {
    [player pause];
    currentTime = player.currentTime;
    [player seekToTime:CMTimeMake(0, 1)];

    [self presentViewController:avPlayerController animated:YES completion:^{
        [avPlayerController.player seekToTime:currentTime];
        [avPlayerController.player play];
    }];
}

score 1 · Accepted Answer

在我的情况下，我只允许在 iPhone 上使用纵向模式，而我希望它AVPlayerViewController具有所有方向。

在AppDelegate我有看起来像这样的代码：

public func application(application: UIApplication, supportedInterfaceOrientationsForWindow window: UIWindow?) -> UIInterfaceOrientationMask {

    if self.window?.rootViewController?.presentedViewController is AVPlayerViewController {

        return .All
    }
    return Device.current.contains(.iPhone) ? [.Portrait, .PortraitUpsideDown] : .All
}

当AVPlayerViewController以模态方式呈现，旋转到横向并被解雇时，我会得到一个非常微笑的错误堆栈，一些约束被打破了。

要解决方法，我将此代码添加到我RootViewController的中，它还显示了我的应用程序中的任何实例AVPlayerViewController：

public override func dismissViewControllerAnimated(flag: Bool, completion: (() -> Void)?) {

    if let playerViewController = self.presentedViewController as? AVPlayerViewController {

        playerViewController.showsPlaybackControls = false
    }

    super.dismissViewControllerAnimated(flag, completion: completion)
}

基本上，我正在捕捉用户点击关闭按钮并使用原始问题帖子中的解决方法的那一刻。

score 0 · Accepted Answer

我意识到，当您尝试在第二次、第三次……等时间呈现相同的 AVPlayerViewController 实例（使用强引用属性）并且播放器控件未重置（即进度不在开始时）时，就会发生这种情况。

实际上，如果您面临相同的情况，请在点击“完成”之前尝试将进度条拖到开头并再次呈现 AVPlayerViewController。然后自动布局问题应该消失了！

因此，如果您在关闭 AVPlayerViewController 之前重置控件，基本上可以修复 Autolayout 问题（顺便说一下 Apple 问题）。但是，如果您想呈现相同的视频怎么办？就我而言，我想保留对 AVPlayerItem 的引用：

@property (strong, nonatomic) AVPlayerItem *playerItem;

但我不希望发生这种崩溃：

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'An AVPlayerItem cannot be associated with more than one instance of AVPlayer'
*** First throw call stack:
(0x184035900 0x1836a3f80 0x18a254958 0x18a23fc14 0x100054a2c 0x188d5fe50 0x188d5fdcc 0x188d47a88 0x188d5f6e4 0x188d18294 0x188d58820 0x188d57e1c 0x188d284cc 0x188d26794 0x183fecefc 0x183fec990 0x183fea690 0x183f19680 0x185428088 0x188d90d90 0x1000eea78 0x183aba8b8)
libc++abi.dylib: terminating with uncaught exception of type NSException

所以我的解决方法是每次推送 AVPlayerViewController 时创建一个 AVPLayerItem 的副本。这样，崩溃和自动布局问题就消失了。但是，每次按下播放器时，视频都会重置。

AVPlayerViewController *playerViewController = [AVPlayerViewController new];
playerViewController.player = [[AVPlayer alloc] initWithPlayerItem:self.playerItem.copy];

score -1 · Accepted Answer

此警告表示您使用了一个不需要使用的额外约束。

ToolBarHeight默认为44，适用于所有 iphone 设备，您在此处使用了高度约束UIToolBar。所以工具栏高度约束在这里是额外的，删除这个约束警告将被自动删除

ios - 无法同时满足在情节提要中嵌入 AVPlayerViewController 的约束警告

6 回答 6

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