堆栈视图生成的约束破坏

Question

我有一个视图控制器，其中几个堆栈视图彼此嵌套。故事板看起来很好，一切都很完美。但是在运行时我得到以下输出。

2016-02-15 15:08:32.330 WVSurvey[97389:14208896] 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. 
(
    "<_UILayoutSupportConstraint:0x7fbb917aa030 V:|-(0)-[_UILayoutGuide:0x7fbb93901a50]   (Names: '|':UIStackView:0x7fbb915bc420 )>",
    "<NSLayoutConstraint:0x7fbb91488be0 'UISV-canvas-connection' V:[UIStackView:0x7fbb9390ced0]-(0)-|   (Names: '|':UIStackView:0x7fbb915bc420 )>",
    "<NSLayoutConstraint:0x7fbb914b2950 'UISV-spacing' V:[UIStackView:0x7fbb9390ced0]-(0)-[_UILayoutGuide:0x7fbb93901a50]>",
    "<NSLayoutConstraint:0x7fbb93a2af30 'UIView-Encapsulated-Layout-Height' V:[UIStackView:0x7fbb915bc420(1024)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x7fbb914b2950 'UISV-spacing' V:[UIStackView:0x7fbb9390ced0]-(0)-[_UILayoutGuide:0x7fbb93901a50]>

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.
2016-02-15 15:08:32.330 WVSurvey[97389:14208896] 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. 
(
    "<_UILayoutSupportConstraint:0x7fbb91709db0 V:[_UILayoutGuide:0x7fbb93901a50(0)]>",
    "<_UILayoutSupportConstraint:0x7fbb917aa030 V:|-(0)-[_UILayoutGuide:0x7fbb93901a50]   (Names: '|':UIStackView:0x7fbb915bc420 )>",
    "<_UILayoutSupportConstraint:0x7fbb93912770 V:[_UILayoutGuide:0x7fbb9390c080(0)]>",
    "<_UILayoutSupportConstraint:0x7fbb93912720 _UILayoutGuide:0x7fbb9390c080.bottom == UIStackView:0x7fbb915bc420.bottom>",
    "<NSLayoutConstraint:0x7fbb914e6aa0 'UISV-spacing' V:[_UILayoutGuide:0x7fbb93901a50]-(0)-[_UILayoutGuide:0x7fbb9390c080]>",
    "<NSLayoutConstraint:0x7fbb93a2af30 'UIView-Encapsulated-Layout-Height' V:[UIStackView:0x7fbb915bc420(1024)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x7fbb914e6aa0 'UISV-spacing' V:[_UILayoutGuide:0x7fbb93901a50]-(0)-[_UILayoutGuide:0x7fbb9390c080]>

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.
2016-02-15 15:08:32.331 WVSurvey[97389:14208896] 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. 
(
    "<_UILayoutSupportConstraint:0x7fbb91709db0 V:[_UILayoutGuide:0x7fbb93901a50(20)]>",
    "<NSLayoutConstraint:0x7fbb914e6af0 'UISV-hiding' V:[_UILayoutGuide:0x7fbb93901a50(0)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x7fbb914e6af0 'UISV-hiding' V:[_UILayoutGuide:0x7fbb93901a50(0)]>

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.

此外，这是故事板的样子，与运行时相比。

不应该有一堆黑色，但除了所有似乎看起来都是正确的。无法修复黑色背景。

我的问题是如果我甚至不制作它们，我如何追踪和修复冲突的约束？我甚至尝试删除所有约束，但仍然得到此输出。