UIViewController声明周期-iOS11新增

class subViewController: UIViewController {
    
    //nib文件的初始化
    override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
        print(#function)
    }
    
    //storyboard文件的初始化
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    //只有UIView且xib时才会调用该方法
    override class func awakeFromNib() {
        super.awakeFromNib()
        print(#function)
    }

    //加载vc中的view。可以返回自定义view
    override func loadView() {
            super.loadView()
//        view = UIView()
        print(#function)
    }
    
    //vc加载完成后
    override func viewDidLoad() {
        super.viewDidLoad()
        print(#function)
//        view = UIView()
        view.backgroundColor = UIColor.red
        // Do any additional setup after loading the view.
    }

    //vc即将出现
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        
        print(#function)
    }
    
    //根视图的布局边距已更改。
    override func viewLayoutMarginsDidChange() {
        print(#function)
    }
    
    //根视图的布局安全边距已更改。>ios11.0
    override func viewSafeAreaInsetsDidChange() {
        print(#function)
    }
    
    //当前视图更新约束是调用.>ios11.0
    override func updateViewConstraints() {
        super.updateViewConstraints()
        print(#function)
    }
        
    //布局更新时代用
    //layoutIfNeeded调用更新后会也会调用
    override func viewWillLayoutSubviews() {
        super.viewWillLayoutSubviews()
        print(#function)
    }
    
    //布局更新完成
    //layoutIfNeeded调用更新后会也会调用
    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        print(#function)
    }
    
    //页面已经出现
    override func viewDidAppear(_ animated: Bool) {
        print(#function)
    }
    
    //页面即将消失
    override func viewWillDisappear(_ animated: Bool) {
        print(#function)
    }
    
    //页面已经消失
    override func viewDidDisappear(_ animated: Bool) {
        print(#function)
    }
    
    //内存警告时调用
    override func didReceiveMemoryWarning() {
        
    }
    
    //vc回收时调用
    deinit {
        print(#function)
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        view.setNeedsLayout()
        view.layoutIfNeeded()
        
    }
    
}