fullVC

fullVC

class ViewController: UIViewController {
    @IBOutlet weak var button: UIButton!
    override func viewDidLoad() {
        super.viewDidLoad()
        self.view.backgroundColor = .blue
        print (self.view.bounds)
        let subView = UIView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
        subView.backgroundColor = .black
        self.view.addSubview(subView)
        subView.translatesAutoresizingMaskIntoConstraints = false
        subView.leadingAnchor.constraint(equalTo: self.view.leadingAnchor, constant: 100).isActive = true
        subView.trailingAnchor.constraint(equalTo: self.view.trailingAnchor, constant: -100).isActive = true
        subView.topAnchor.constraint(equalTo: self.view.topAnchor, constant: 100).isActive = true
        subView.bottomAnchor.constraint(equalTo: self.view.bottomAnchor, constant: -100).isActive = true
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        print ("will")
    }
    
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        print ("did")
    }
    
    override func viewDidDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
    }

    override func viewWillLayoutSubviews() {
        super.viewWillLayoutSubviews()
    }
    
    override func viewDidLayoutSubviews() {
        super.viewWillLayoutSubviews()
        button.frame = CGRect(x: (self.view.frame.width / 2) - (self.button.frame.width / 2), y: self.view.frame.height - 100, width: button.frame.width, height: button.frame.height )
    }
}