弹出view

用swift实现一个灰色的弹层，点击背景隐藏，点击子视图，走子视图的响应。如何实现。

import Foundation
import UIKit
class XYZPresentBackgroundView: UIView {
    
    var animationDur: Double = 0.2 //default 0.2s
    override init(frame: CGRect) {
        var f = frame;
        
        if f.size == CGSize.zero {
            f = CGRect.init(x: 0, y: 0, width: UIScreen.main.bounds.size.width, height: UIScreen.main.bounds.size.height)
        }
        super.init(frame: f)
        self.backgroundColor = UIColor.init(red: 0.2, green: 0.2, blue: 0.2, alpha: 0.5)
        
        let tab:UITapGestureRecognizer = UITapGestureRecognizer.init(target: self, action: #selector(tap(_:)))
        tab.delegate = self
        self.addGestureRecognizer(tab)
        
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    @objc func tap(_ tap:UITapGestureRecognizer){
        self.hidden()
    }
    
    func show() {
        let size:CGSize = UIScreen.main.bounds.size
        self.frame = CGRect.init(x: 0, y: size.height, width: size.width, height: size.height)
        UIView.animate(withDuration: animationDur) {
            self.frame = CGRect.init(x: 0, y: 0, width: size.width, height: size.height)
        } completion: { (_ success:Bool) in
            
        }
    }
    
    func hidden() {
        UIView.animate(withDuration: animationDur) {
            let size:CGSize = UIScreen.main.bounds.size
            self.frame = CGRect.init(x: 0, y: size.height, width: size.width, height: size.height)
        } completion: { (_ success:Bool) in
            
        }
    }
}


extension XYZPresentBackgroundView:UIGestureRecognizerDelegate {
    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
        for view in self.subviews {
            if touch.view == view {
                return false
            }
        }
        return true
    }
}