如何在swift中添加一个独立的按键UIView？

import UIKit

class CustomButtonView: UIView {
    var button: UIButton!
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        button = UIButton(type: .system)
        button.setTitle("按键", for: .normal)
        button.addTarget(self, action: #selector(buttonTapped), for: .touchUpInside)
        
        addSubview(button)
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    override func layoutSubviews() {
        super.layoutSubviews()
        
        button.frame = bounds
    }
    
    @objc func buttonTapped() {
        // 处理按键点击事件
    }
}

// 在视图控制器中使用CustomButtonView
class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let customButtonView = CustomButtonView(frame: CGRect(x: 100, y: 100, width: 100, height: 50))
        view.addSubview(customButtonView)
    }
}