create and close slide subview in iOS with swift

ios_swift_slide_view.swift

func showSlideView() {
    
    let parentFrame = self.view.frame
    let leftframe = CGRect(x: 0, y: 0, width: 0, height: parentFrame.height)
    let rightframe = CGRect(x: parentFrame.width * 0.8, y: 0, width: parentFrame.width * 0.2, height: parentFrame.height)
    let slideView = UIView(frame: leftframe)
    let rightView = UIView(frame: rightframe)
    
    let singleFingerTap = UITapGestureRecognizer(target: self, action: #selector(self.closeSlide))
    rightView.addGestureRecognizer(singleFingerTap)
        
    slideView.backgroundColor = UIColor(red: 2, green: 2, blue: 2, alpha: 0.8)
    slideView.layer.shadowOpacity = 0.8
    rightView.backgroundColor = UIColor(red: 1, green: 1, blue: 1, alpha: 0.95)

    self.view.addSubview(slideView)
    UIView.transition(with: slideView, duration: 1.0, options: UIViewAnimationOptions.curveEaseInOut, animations: ({slideView.frame = CGRect(x: 0, y: 0, width: parentFrame.width * 0.8, height: parentFrame.height)}))
    self.view.insertSubview(rightView, belowSubview: slideView)
    UIView.transition(with: slideView, duration: 0.5, options: UIViewAnimationOptions.curveEaseInOut, animations: ({rightView.alpha = 1}))
        
    self.leftSubView = slideView
    self.rightSubView = rightView
}


func closeSlide(_ sender: UITapGestureRecognizer) {
        let parentFrame = self.view.frame
        UIView.transition(with: self.leftSubView, duration: 1.0, options: UIViewAnimationOptions.curveEaseInOut, animations: ({self.leftSubView.frame = CGRect(x: 0, y: 0, width: 0, height: parentFrame.height)}))
        UIView.transition(with: self.rightSubView, duration: 0.5, options: UIViewAnimationOptions.curveEaseInOut, animations: ({self.rightSubView.alpha = 0}))
}