Answers for "apply constraints with code swift"

swift ways to setup constraints

//https://stackoverflow.com/a/26181982/13171606
//There are multiple ways to add contraints, please open Link for almost ecery type of constraint

override func viewDidLoad() {
    let newView = UIView()
    newView.backgroundColor = UIColor.red
  
    view.addSubview(newView)
    
    newView.translatesAutoresizingMaskIntoConstraints = false//compulsory
    newView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
    newView.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
    newView.widthAnchor.constraint(equalToConstant: 100).isActive = true
    newView.heightAnchor.constraint(equalToConstant: 100).isActive = true
}

swift constraints programmatically

/*
// regular use
1.leftAnchor
2.rightAnchor
3.topAnchor
// intermediate use
4.widthAnchor
5.heightAnchor
6.bottomAnchor
7.centerXAnchor
8.centerYAnchor
// rare use
9.leadingAnchor
10.trailingAnchor
etc. (note: very project to project)
*/