使用自动布局Swift定位uibutton

Question

我有两个uiview uibuttons 问题是 - 我无法理解如何使用auto-layout constraints以便按以下方式定位它们

提前感谢您的任何见解！

Answer 1

尝试这样的事情：

   //Individual button Width
    self.view.addConstraint(NSLayoutConstraint(item: button1, attribute: NSLayoutAttribute.Width, relatedBy: NSLayoutRelation.Equal, toItem: self.view, attribute: NSLayoutAttribute.Width, multiplier: 0.25, constant: 0))
    self.view.addConstraint(NSLayoutConstraint(item: button2, attribute: NSLayoutAttribute.Width, relatedBy: NSLayoutRelation.Equal, toItem: self.view, attribute: NSLayoutAttribute.Width, multiplier: 0.25, constant: 0))

    //Button1 left spacing
    self.view.addConstraint(NSLayoutConstraint(item: button1, attribute: NSLayoutAttribute.Leading, relatedBy: NSLayoutRelation.Equal, toItem: self.view, attribute: NSLayoutAttribute.Leading, multiplier: 1, constant: self.view.frame.size.width * 0.15))

    //Button2 Right Spacing
    self.view.addConstraint(NSLayoutConstraint(item: button2, attribute: NSLayoutAttribute.Trailing, relatedBy: NSLayoutRelation.Equal, toItem: self.view, attribute: NSLayoutAttribute.Trailing, multiplier: 1, constant: -self.view.frame.size.width * 0.15))

    //Y placement
    self.view.addConstraint(NSLayoutConstraint(item: button1, attribute: NSLayoutAttribute.CenterY, relatedBy: NSLayoutRelation.Equal, toItem: self.view, attribute: NSLayoutAttribute.CenterY, multiplier: 1, constant: 0))
    self.view.addConstraint(NSLayoutConstraint(item: button1, attribute: NSLayoutAttribute.CenterY, relatedBy: NSLayoutRelation.Equal, toItem: button2, attribute: NSLayoutAttribute.CenterY, multiplier: 1, constant: 0))

此外，您将需要重置旋转约束，因为self.view.frame.size.width将更改。它已被用于计算约束常数。

Answer 2

如果您不想重置约束，可以尝试制作这样的间距约束：

self.view.addConstraint(NSLayoutConstraint(item: self.view, attribute: NSLayoutAttribute.CenterX, relatedBy: NSLayoutRelation.Equal, toItem: button1, attribute: NSLayoutAttribute.CenterX, multiplier: 0.275, constant: 0))
self.view.addConstraint(NSLayoutConstraint(item: self.view, attribute: NSLayoutAttribute.CenterX, relatedBy: NSLayoutRelation.Equal, toItem: button2, attribute: NSLayoutAttribute.CenterX, multiplier: 0.625, constant: 0))

请注意，视图的顺序是相反的。

我已经成功地将它用于IB，应该使用代码。