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iOS之UIView的基本使用(Swift 4.2)

 override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        let rect1 = CGRect(x: 30, y: 50, width: 200, height: 200)
        let view1 = UIView(frame: rect1)
        view1.backgroundColor = UIColor.brown

        let rect2 = CGRect(x: 90, y: 120, width: 200, height: 200)
        let view2 = UIView(frame: rect2)
        view2.backgroundColor = UIColor.purple

        self.view.addSubview(view1)
        self.view.addSubview(view2)