How to reuse slide up menu class in any view controller?

I am trying to create a slide up menu, completely defined in a custom class named OldMenu.

It would show every time a user tap a UIBarButtonItem, that is also defined in that class.

So the button, the menu, and the menu animation to show the menu are all defined in this custom class.

For now, I can just access the button from an other class but it doesn't seem to trigger the animation to show the menu.

Any one knows why this code isn't working?

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        let oldMenu = OldMenu()
        navigationItem.rightBarButtonItems = [oldMenu.MenuButton]
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}

class OldMenu: NSObject, UITableViewDelegate, UITableViewDataSource {
    var tableView: UITableView {
        let tableView = UITableView()
        tableView.isScrollEnabled = true
        tableView.delegate = self
        tableView.dataSource = self
        tableView.register(CustomTableViewCell.self, forCellReuseIdentifier: "Cell")
        return tableView
    }
    
    var transparentView = UIView()
    
    let height: CGFloat = 250
    
    var MenuButton: UIBarButtonItem {
        let btn = UIBarButtonItem()
        btn.title = "Menu"
        btn.target = self
        btn.action = #selector(onClickMenu)
        return btn
    }
}

extension OldMenu {
    
    @objc func onClickMenu(_ sender: Any) {
        let window = UIApplication.shared.keyWindow
        transparentView.backgroundColor = UIColor.black.withAlphaComponent(0.9)
        transparentView.frame = window?.bounds ?? .zero
        window?.addSubview(transparentView)
        
        let screenSize = UIScreen.main.bounds.size
        tableView.frame = CGRect(x: 0, y: screenSize.height, width: screenSize.width, height: height)
        window?.addSubview(tableView)
        
        let tapGesture = UITapGestureRecognizer(target: self, action: #selector(onClickTransparentView))
        transparentView.addGestureRecognizer(tapGesture)
        
        transparentView.alpha = 0
        
        UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 1.0, initialSpringVelocity: 1.0, options: .curveEaseInOut, animations: {
            self.transparentView.alpha = 0.5
            self.tableView.frame = CGRect(x: 0, y: screenSize.height - self.height, width: screenSize.width, height: self.height)
        }, completion: nil)
        
    }
    
    @objc func onClickTransparentView() {
        let screenSize = UIScreen.main.bounds.size

        UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 1.0, initialSpringVelocity: 1.0, options: .curveEaseInOut, animations: {
            self.transparentView.alpha = 0
            self.tableView.frame = CGRect(x: 0, y: screenSize.height, width: screenSize.width, height: self.height)
        }, completion: nil)
    }
}

extension OldMenu {
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return 5
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        return UITableViewCell()
    }
    
    func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
        return 50
    }
    
}

Solution

Code

class ViewController: UIViewController {

var oldMenu: OldMenu!

   override func viewDidLoad() {
      super.viewDidLoad()
    
       oldMenu = OldMenu(controller: self)
       navigationItem.rightBarButtonItem = oldMenu.MenuButton
   }

   override func didReceiveMemoryWarning() {
      super.didReceiveMemoryWarning()
      // Dispose of any resources that can be recreated.
   }
}

extension ViewController: MenuDelegate {


   func tableRowDidSelect(_ indexPath: IndexPath) {
    
   }
}

OldMenu

class OldMenu: NSObject {
    
    var presenter: UIViewController?
    
    var menuController = MenuViewController()

    var MenuButton: UIBarButtonItem!
    
    init(controller: UIViewController?) {
        super.init()
        presenter = controller
        MenuButton = UIBarButtonItem(title: "Menu", style: .plain, target: self, action: #selector(onClickMenu))
    }
    
    @objc func onClickMenu() {
        menuController.modalPresentationStyle = .custom
        menuController.transitioningDelegate = self
        menuController.delegate = presenter as! MenuDelegate
        presenter?.present(menuController, animated: true, completion: nil)
    }
}

extension OldMenu: UIViewControllerTransitioningDelegate {
    
    func presentationController(forPresented presented: UIViewController, presenting: UIViewController?, source: UIViewController) -> UIPresentationController? {
        PresentationController(presentedViewController: presented, presenting: presenting)
    }
    
}

MenuViewController

Configure your tableView in MenuViewController, and use delegates to communicate back to the main view

protocol MenuDelegate {
    func tableRowDidSelect(_ indexPath: IndexPath)
}

// Configure your tableView in MenuViewController
// Use delegates to communicate back to main view
class MenuViewController: UIViewController {
    
    var delegate: MenuDelegate?
    
    override func viewDidLoad() {
        view.backgroundColor = .gray
    }
}

PresentationController

You can reuse PresentationController to present view controllers in half screen.

import Foundation
import UIKit

class PresentationController: UIPresentationController {

  let blurEffectView: UIVisualEffectView!
  var tapGestureRecognizer: UITapGestureRecognizer = UITapGestureRecognizer()
  
  override init(presentedViewController: UIViewController, presenting presentingViewController: UIViewController?) {
      let blurEffect = UIBlurEffect(style: .dark)
      blurEffectView = UIVisualEffectView(effect: blurEffect)
      super.init(presentedViewController: presentedViewController, presenting: presentingViewController)
      tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(dismissController))
      blurEffectView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
      self.blurEffectView.isUserInteractionEnabled = true
      self.blurEffectView.addGestureRecognizer(tapGestureRecognizer)
  }
  
  override var frameOfPresentedViewInContainerView: CGRect {

      // Set your presentation height
      let presentHeight: CGFloat = 300
      
      return CGRect(origin: CGPoint(x: 0, y: self.containerView!.frame.height - presentHeight),
             size: CGSize(width: self.containerView!.frame.width, height: presentHeight))
  }

  override func presentationTransitionWillBegin() {
      self.blurEffectView.alpha = 0
      self.containerView?.addSubview(blurEffectView)
      self.presentedViewController.transitionCoordinator?.animate(alongsideTransition: { (UIViewControllerTransitionCoordinatorContext) in
          self.blurEffectView.alpha = 0.5
      }, completion: { (UIViewControllerTransitionCoordinatorContext) in })
  }
  
  override func dismissalTransitionWillBegin() {
      self.presentedViewController.transitionCoordinator?.animate(alongsideTransition: { (UIViewControllerTransitionCoordinatorContext) in
          self.blurEffectView.alpha = 0
      }, completion: { (UIViewControllerTransitionCoordinatorContext) in
          self.blurEffectView.removeFromSuperview()
      })
  }
  
  override func containerViewWillLayoutSubviews() {
      super.containerViewWillLayoutSubviews()
      
      // set your corner radius
    presentedView!.roundCorners([.topLeft, .topRight], radius: 18)
  }

  override func containerViewDidLayoutSubviews() {
      super.containerViewDidLayoutSubviews()
      presentedView?.frame = frameOfPresentedViewInContainerView
      blurEffectView.frame = containerView!.bounds
  }

  @objc func dismissController(){
      self.presentedViewController.dismiss(animated: true, completion: nil)
  }
}

extension UIView {
  func roundCorners(_ corners: UIRectCorner, radius: CGFloat) {
      let path = UIBezierPath(roundedRect: bounds, byRoundingCorners: corners,
                              cornerRadii: CGSize(width: radius, height: radius))
      let mask = CAShapeLayer()
      mask.path = path.cgPath
      layer.mask = mask
  }
}

How to reuse slide up menu class in any view controller?

Code

Result