在多个UIViews周围创建边框

import UIKit

class BorderView: UIView {
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        // 创建需要添加边框的UIViews
        let view1 = UIView(frame: CGRect(x: 10, y: 10, width: 100, height: 100))
        view1.backgroundColor = .red
        
        let view2 = UIView(frame: CGRect(x: 120, y: 10, width: 100, height: 100))
        view2.backgroundColor = .blue
        
        let view3 = UIView(frame: CGRect(x: 230, y: 10, width: 100, height: 100))
        view3.backgroundColor = .green
        
        // 为每个UIView设置边框的宽度和颜色
        view1.layer.borderWidth = 2.0
        view1.layer.borderColor = UIColor.black.cgColor
        
        view2.layer.borderWidth = 2.0
        view2.layer.borderColor = UIColor.black.cgColor
        
        view3.layer.borderWidth = 2.0
        view3.layer.borderColor = UIColor.black.cgColor
        
        // 将UIViews添加到自定义的UIView子类中
        addSubview(view1)
        addSubview(view2)
        addSubview(view3)
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

// 在ViewController中使用BorderView
class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let borderView = BorderView(frame: CGRect(x: 50, y: 50, width: 350, height: 120))
        borderView.backgroundColor = .white
        
        view.addSubview(borderView)
    }
}