BlueView

BlueView

class BlueView: UIView {
    var myLabel = UILabel()
    // init from code
    override init(frame: CGRect) {
      super.init(frame: frame)
      setupView()
    }
    
    // init from xib or storyboard
    required init?(coder aDecoder: NSCoder) {
      super.init(coder: aDecoder)
      setupView()
    }
    
    // common setup code
    private func setupView() {
      backgroundColor = .red
        myLabel.text = "a"
        myLabel.textAlignment = .center
        self.addSubview(myLabel)
        myLabel.translatesAutoresizingMaskIntoConstraints = false
        myLabel.widthAnchor.constraint(equalTo: self.widthAnchor).isActive = true
        myLabel.heightAnchor.constraint(equalTo: self.heightAnchor).isActive = true
        myLabel.centerYAnchor.constraint(equalTo: self.centerYAnchor).isActive = true
        myLabel.centerXAnchor.constraint(equalTo: self.centerXAnchor).isActive = true
    }
}