无法同时满足约束 - 制图

Posted 2023-02-27

【中文标题】无法同时满足约束 - 制图

【英文标题】：Unable to simultaneously satisfy constraints - Cartography

【发布时间】：2015-09-23 04:11:43

【问题描述】：

我在使用 Swift 2.0 编写的应用程序中使用 AutoLayout 和代码，并使用 Cartograph 来帮助约束。 但是有些东西阻止了我的应用程序，否则，我会使用它以编程方式添加视图。

func addButtonOne() -> Void 
    buttonOne = UIButton()
    buttonOne.backgroundColor = UIColor.greenColor()
    self.view.addSubview(buttonOne)

    constrain(buttonOne, view)  buttonOne, view in
        buttonOne.left == view.right - 12
        buttonOne.right == view.left + 12
        buttonOne.bottom == view.bottom - 12
    

但编译后，返回：

2015-09-23 00:54:24.489 Fun With Swift[24809:2358352] 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:0x7afe2160 H:[UIView:0x7afdfe90]-(-12)-[UIButton:0x7afe13b0](LTR)>",
"<NSLayoutConstraint:0x7afe2730 UIButton:0x7afe13b0.right == UIView:0x7afdfe90.left + 12>",
"<NSLayoutConstraint:0x7b0866e0 'UIView-Encapsulated-Layout-Width' H:[UIView:0x7afdfe90(320)]>"
)

有人知道我能做什么吗？这是一个不同的问题，因为我使用了一个库。

【问题讨论】：

Auto-layout: What creates constraints named UIView-Encapsulated-Layout-Width & Height?的可能重复

没有。我正在使用 Swift 和一个库来做到这一点。

我不认为图书馆是这里的问题。

问题出在这两个关系 buttonOne.left == view.right - 12 buttonOne.right == view.left + 12. buttonOnce 怎么才能让 view.right 和 buttonOne.right 和 view.留下相关的？

【参考方案1】：

添加约束代码应如下所示

 constrain(buttonOne, view)  buttonOne, view in
            buttonOne.left == view.left + 12
            buttonOne.right == view.right - 12
            buttonOne.bottom == view.bottom - 12
        

如果您需要底部的按钮，距离左右和底部有 12 pt 的边距