UIStackView＆QUOT;无法同时满足约束＆QUOT;在＆QUOT;压扁＆QUOT;隐藏视图 [英] UIStackView "Unable to simultaneously satisfy constraints" on "squished" hidden views

问题描述

当我UIStackView行被压扁，他们扔自动版式警告。但是，他们显示效果细腻，没有别的是错误的，除了这类测井公司的：

When my UIStackView "rows" are squished, they throw AutoLayout warnings. However, they display fine and nothing else is wrong besides these sorts of loggings:

无法同时满足约束条件。
      大概在以下列表中的约束条件中的至少一个是一个你不想要的。试试这个：（1）看一下每个约束和揣摩，你不要指望; （2）找到code，它增加了不必要的约束或限制并修复它。 （注：如果你看到你不明白NSAutoresizingMaskLayoutConstraints，请参阅文档UIView的财产translatesAutoresizingMaskIntoConstraints）
  （

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) (

所以，我不知道如何解决还没有这一点，但它似乎并没有破坏任何东西，除了只是被恼人的。

So, I'm not sure how to fix this yet, but it doesn't seem to break anything besides just being annoying.

有谁知道如何解决呢？有趣的是，布局限制的标签往往是'UISV隐藏，这表明或许应该忽略在这种情况下的子视图或某事的高度最低？

Does anyone know how to solve it? Interestingly, the layout constraints are tagged quite often with 'UISV-hiding', indicating that perhaps it should ignore the height minimums for subviews or something in this instance?

推荐答案

您因为在 UIStackView 设置子视图时隐时得到这个问题，它会首先限制其高度为零，以动画它。

You get this issue because when setting a subview from within UIStackView to hidden, it will first constrain its height to zero in order to animate it out.

我收到以下错误：

2015-10-01 11:45:13.732 <redacted>[64455:6368084] 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:0x7f7f5be18c80 V:[UISegmentedControl:0x7f7f5bec4180]-(8)-|   (Names: '|':UIView:0x7f7f5be69d30 )>",
    "<NSLayoutConstraint:0x7f7f5be508d0 V:|-(8)-[UISegmentedControl:0x7f7f5bec4180]   (Names: '|':UIView:0x7f7f5be69d30 )>",
    "<NSLayoutConstraint:0x7f7f5bdfbda0 'UISV-hiding' V:[UIView:0x7f7f5be69d30(0)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x7f7f5be18c80 V:[UISegmentedControl:0x7f7f5bec4180]-(8)-|   (Names: '|':UIView:0x7f7f5be69d30 )>

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.

我要怎样做，就是把一个的UIView 中的我的 UIStackView 包含一个 UISegmentedControl 通过在每个边缘8分插图。

What I was trying to do, was to place a UIView within my UIStackView that contained a UISegmentedControl inset by 8pts on each edge.

当我将它设置为隐藏，它会尝试将容器视图限制到零高度，但因为我有一组约束从上到下，有一个矛盾。

When I set it to hidden, it would try to constrain the container view to a zero height but because i have a set of constraints from top to bottom, there was a conflict.

要解决这个问题，我改变了我的8PT顶部的底部约束优先，从1000到999，在 UISV隐藏约束如果需要的话就可以优先。

To resolve the issue, I changed my 8pt top an bottom constraints priority from 1000 to 999 so the UISV-hiding constraint can then take priority if needed.

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