如何在swift中使用NSLayoutConstraint根据屏幕尺寸改变设计

import UIKit

class ViewController: UIViewController {
    
    let myView = UIView()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 设置视图的基本属性
        myView.backgroundColor = .blue
        view.addSubview(myView)
        
        // 启用Auto Layout
        myView.translatesAutoresizingMaskIntoConstraints = false
        
        // 创建约束
        let widthConstraint = myView.widthAnchor.constraint(equalToConstant: UIScreen.main.bounds.width * 0.8)
        let heightConstraint = myView.heightAnchor.constraint(equalToConstant: UIScreen.main.bounds.height * 0.5)
        let centerXConstraint = myView.centerXAnchor.constraint(equalTo: view.centerXAnchor)
        let centerYConstraint = myView.centerYAnchor.constraint(equalTo: view.centerYAnchor)
        
        // 激活约束
        NSLayoutConstraint.activate([widthConstraint, heightConstraint, centerXConstraint, centerYConstraint])
    }
}