How to programmatically create layout and constraints using Swift IOS-CodePudding

How do you programmatically create layout and constraints using Swift IOS. I'm familiar with storyboards, however I'm not sure how to use code to make ui elements.

CodePudding user response：

There are three main steps. First you have to define the element, add it to the view, then add constraints.

For example,

let button = UIButton() 
button.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(button) 

NSLayoutConstraint.activate([
        button.heightAnchor.constraint(equalTo: view.heightAnchor)
      
        
])