iOS，对视图的约束进行动画处理会导致错误"Unable to simultaneously satisfy constraints"

Question

我正在尝试为我的容器视图之一的约束而动画。在IB中，该视图被限制在没有错误或警告的情况下。当我在ViewDidload中调用这些方法时，要更改视图y坐标，例如：

 self.queueContainerYConst.constant += 550;
    [self.view layoutIfNeeded];

我收到了"无法满足约束..."的消息。在运行该应用程序时，我的动画和UI看起来不错，一切似乎都受到适当的约束。这是我在控制台中收到的整个消息。

2015-05-03 14:17:52.668 Streamacy[15914:3333195] 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:0x155a95c0 V:|-(614)-[UIView:0x155a83a0]   (Names: '|':UIView:0x155a91b0 )>",
    "<NSLayoutConstraint:0x155a95f0 V:[UIView:0x155a83a0]-(0)-|   (Names: '|':UIView:0x155a91b0 )>",
    "<NSLayoutConstraint:0x155af080 'UIView-Encapsulated-Layout-Height' V:[UIView:0x155a91b0(568)]>"
)
Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x155a95f0 V:[UIView:0x155a83a0]-(0)-|   (Names: '|':UIView:0x155a91b0 )>
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.
2015-05-03 14:17:52.684 Streamacy[15914:3333195] 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:0x1566a2a0 UIView:0x156a1900.width == UIView:0x156a1900.height>",
    "<NSLayoutConstraint:0x156a9000 V:[UIView:0x156a1900]-(32)-[UIProgressView:0x15688f30]>",
    "<NSLayoutConstraint:0x156a0df0 V:[UIProgressView:0x15688f30]-(11)-[MarqueeLabel:0x156a7360'Awake']>",
    "<NSLayoutConstraint:0x156a0eb0 UIView:0x1569dd90.trailingMargin == UIView:0x156a1900.trailing + 99>",
    "<NSLayoutConstraint:0x156a0f10 UIView:0x156a1900.leading == UIView:0x1569dd90.leadingMargin + 99>",
    "<NSLayoutConstraint:0x156a0f40 UIView:0x156a1900.top == UIView:0x1569dd90.topMargin - 46>",
    "<NSLayoutConstraint:0x156a92f0 V:[UILabel:0x156a6ea0'Tycho']-(17)-[UITableView:0x1587a000]>",
    "<NSLayoutConstraint:0x156a93b0 V:[MarqueeLabel:0x156a7360'Awake']-(2)-[UILabel:0x156a6ea0'Tycho']>",
    "<NSLayoutConstraint:0x156a94d0 V:[UITableView:0x1587a000]-(0)-[_UILayoutGuide:0x156a8b20]>",
    "<_UILayoutSupportConstraint:0x156a4cf0 V:[_UILayoutGuide:0x156a8b20(0)]>",
    "<_UILayoutSupportConstraint:0x156a4810 _UILayoutGuide:0x156a8b20.bottom == UIView:0x1569dd90.bottom>",
    "<NSLayoutConstraint:0x156b6070 'UIView-Encapsulated-Layout-Width' H:[UIView:0x1569dd90(320)]>",
    "<NSLayoutConstraint:0x156b60a0 'UIView-Encapsulated-Layout-Height' V:[UIView:0x1569dd90(0)]>"
)
Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x1566a2a0 UIView:0x156a1900.width == UIView:0x156a1900.height>
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.
2015-05-03 14:17:52.688 Streamacy[15914:3333195] 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:0x156a9000 V:[UIView:0x156a1900]-(32)-[UIProgressView:0x15688f30]>",
    "<NSLayoutConstraint:0x156a0df0 V:[UIProgressView:0x15688f30]-(11)-[MarqueeLabel:0x156a7360'Awake']>",
    "<NSLayoutConstraint:0x156a0f40 UIView:0x156a1900.top == UIView:0x1569dd90.topMargin - 46>",
    "<NSLayoutConstraint:0x156a92f0 V:[UILabel:0x156a6ea0'Tycho']-(17)-[UITableView:0x1587a000]>",
    "<NSLayoutConstraint:0x156a93b0 V:[MarqueeLabel:0x156a7360'Awake']-(2)-[UILabel:0x156a6ea0'Tycho']>",
    "<NSLayoutConstraint:0x156a94d0 V:[UITableView:0x1587a000]-(0)-[_UILayoutGuide:0x156a8b20]>",
    "<_UILayoutSupportConstraint:0x156a4cf0 V:[_UILayoutGuide:0x156a8b20(0)]>",
    "<_UILayoutSupportConstraint:0x156a4810 _UILayoutGuide:0x156a8b20.bottom == UIView:0x1569dd90.bottom>",
    "<NSLayoutConstraint:0x156b60a0 'UIView-Encapsulated-Layout-Height' V:[UIView:0x1569dd90(0)]>"
)
Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x156a9000 V:[UIView:0x156a1900]-(32)-[UIProgressView:0x15688f30]>
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.

看来，我的容器视图中的所有内容都放错了位置，为什么？我是否不正确地进行动画/更改视图？

Answer 1

您的视图过度被约束。您对顶部的约束为614，而在其监督底部的限制为0，但是该视图的高度为568，因此这些数字不会加起来。最好只有这些垂直约束之一和固定的hight以为您的目的（如果您对您的目的）相对于超级图的高度进行调整以适应不同的屏幕尺寸，则可以使用固定的高度。。