使用swift中的代码对两个视图进行约束

import UIKit

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建两个视图
        let view1 = UIView()
        view1.backgroundColor = .red
        view1.translatesAutoresizingMaskIntoConstraints = false
        view.addSubview(view1)
        
        let view2 = UIView()
        view2.backgroundColor = .blue
        view2.translatesAutoresizingMaskIntoConstraints = false
        view.addSubview(view2)
        
        // 添加约束
        NSLayoutConstraint.activate([
            // view1的顶部与父视图的顶部对齐
            view1.topAnchor.constraint(equalTo: view.topAnchor),
            // view1的左侧与父视图的左侧对齐
            view1.leadingAnchor.constraint(equalTo: view.leadingAnchor),
            // view1的宽度为父视图宽度的一半
            view1.widthAnchor.constraint(equalTo: view.widthAnchor, multiplier: 0.5),
            // view1的高度为父视图高度的一半
            view1.heightAnchor.constraint(equalTo: view.heightAnchor, multiplier: 0.5),
            
            // view2的顶部与view1的底部对齐
            view2.topAnchor.constraint(equalTo: view1.bottomAnchor),
            // view2的左侧与view1的右侧对齐
            view2.leadingAnchor.constraint(equalTo: view1.trailingAnchor),
            // view2的宽度与view1相等
            view2.widthAnchor.constraint(equalTo: view1.widthAnchor),
            // view2的高度与view1相等
            view2.heightAnchor.constraint(equalTo: view1.heightAnchor)
        ])
    }
}