无法同时满足约束条件 - 制图

我使用AutoLayout和我的应用程序中使用Swift 2.0编写的代码并使用Cartograph来帮助约束。但是，有东西阻止我的应用程序，否则，我用它来以编程方式添加视图。无法同时满足约束条件 - 制图

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，将返回：

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)]>" 
)

任何人都知道我能做些什么？这是一个不同的问题，因为我使用了一个库。

来源

2015-09-23 Pedro Paulo Amorim

可能重复：什么创造了约束名为UIView-Encapsulated-Layout-Width＆Height？]（http://stackoverflow.com/questions/23308400/auto-layout-what-creates-constraints-named-uiview-encapsulated-layout-width-h） – jtbandes

我使用Swift和一个库来做到这一点。 –

我不认为图书馆是这里的问题。 – jtbandes

的附加约束代码应该像下面

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

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来源

2015-09-23 05:28:28 Johnykutty

无法同时满足约束条件 - 制图

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