按钮底部编程

Question

我想使用这个库：

https://github.com/yannickl/DynamicButton#requirements

，我需要把底部编程（SWIFT）在我的ViewController的底部与底部之间有点距离的和按钮。我怎么能这样做？

非常感谢！

Answer 1

使用自动布局

self.view.addSubview(button) 

button.translatesAutoresizingMaskIntoConstraints = false 

button.centerXAnchor.constraint(equalTo: self.view.centerXAnchor).isActive = true 
button.widthAnchor.constraint(equalToConstant: 50).isActive = true 
button.heightAnchor.constraint(equalToConstant: 50).isActive = true 
button.bottomAnchor.constraint(equalTo: self.view.bottomAnchor, constant: -20).isActive = true 

Answer 2

let bottomOffset = 20 

let yourButton = UIButton(frame: CGRect(X:0, y:0, width:50, height:50)) 
yourButton.backgroundColor = UIColor.red 
yourButton.frame.origin = CGPoint(X:0, y:self.view.framse.size.height - yourButton.frame.size.height - bottomOffset) 

self.view.addsubview(yourButton)