tylerlantern

class BHMenuTransitionAnimator: NSObject , UIViewControllerAnimatedTransitioning  {
  
  var fromViewController : UIViewController!
  
  init(fromViewController vc  : UIViewController ) {
    super.init()
    self.fromViewController = vc
  }
  
  func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {

tylerlantern

func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
  let containerView = transitionContext.containerView
  transitionContext.viewController(forKey: .from)
  let fromVc = transitionContext.viewController(forKey: .from)!
  let toVc = transitionContext.viewController(forKey: .to)!
  let isPresenting = self.fromViewController == fromVc ? true : false
  if  isPresenting{
    let targetWidth = fromVc.view.frame.width * 0.85
    toVc.view.frame = CGRect(x: targetWidth * -1, y: 0, width: targetWidth, height: fromVc.view.frame.height)
    containerView.addSubview(toVc.view)

tylerlantern

class BHMenuTransitionManager: NSObject {
  
  var transitionAnimator : BHMenuTransitionAnimator!
  
  init(instance :  BHMenuTransitionManagerDelegate,fromViewController vc: UIViewController ) {
    super.init()
    transitionAnimator =  BHMenuTransitionAnimator(fromViewController: vc)
  }
  
}

tylerlantern

extension BHMenuTransitionManager : UIViewControllerTransitioningDelegate {
  
  func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
    return transitionAnimator
  }
  
  func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
    return transitionAnimator
  }
  

tylerlantern

class FirstViewController: UIViewController {
  
  lazy var transitionManager = BHMenuTransitionManager(instance: self, fromViewController: self.navigationController!)
  @IBAction func action_openSideMenu(_ sender: Any) {
    self.performSegue(withIdentifier: "segueMenu", sender: nil)
  }
  
  override func viewDidLoad() {
    super.viewDidLoad()
  }

tylerlantern

class MenuViewController : UIViewController {
  
  @IBAction func action_dismiss(_ sender: Any) {
    self.dismiss(animated: true, completion: nil)
  }
  
  override func viewDidLoad() {
    super.viewDidLoad()
  }
  

tylerlantern

public class BHMenuPresentation: UIPresentationController {
    
    var bhDelegate : BHMenuPresentationDelegate?
    public var dimmingView: UIView!
    
    override init(presentedViewController: UIViewController, presenting presentingViewController: UIViewController?) {
      super.init(presentedViewController: presentedViewController, presenting: presentingViewController)
      setupDimmingView()
    }
    

tylerlantern

  override public func presentationTransitionWillBegin() {
        super.presentationTransitionWillBegin()
        dimmingView.frame = presentingViewController.view.bounds
        containerView?.addSubview(dimmingView)
        guard let coordinator = presentedViewController.transitionCoordinator else {
            return
        }
        coordinator.animate(alongsideTransition: { (context) in
            self.dimmingView.alpha = 0.5
        }, completion: nil)

tylerlantern

extension BHMenuTransitionManager : UIViewControllerTransitioningDelegate {  

 func presentationController(forPresented presented: UIViewController, presenting: UIViewController?, source: UIViewController) -> UIPresentationController? {
     presentationAnimator = BHMenuPresentation(presentedViewController: presented, presenting: presenting)
     return presentationAnimator
 }

}

tylerlantern

class BHMenuInteraction: UIPercentDrivenInteractiveTransition {
    var transitionInProgress = false
    var shouldCompleteTransition = false
    var const :  CGFloat = 0
    var presentedViewController : UIViewController!
    func attachViewController(presentedViewController vc : UIViewController)  {
        presentedViewController = vc
    }
    func setUpGestureOnView(view : UIView?){
        guard let view = view else {return}