Blog - Hamburger Menu on iOS Done Right - Open and Close Menu Convenience Functions

Open and Close Menu Convenience Functions

func openMenu() {
        
      // when menu is opened, it's left constraint should be 0
      constraintMenuLeft.constant = 0

      // view for dimming effect should also be shown
      viewBlack.isHidden = false

      // animate opening of the menu - including opacity value
      UIView.animate(withDuration: 0.3, animations: {
          self.view.layoutIfNeeded()
          self.viewBlack.alpha = self.maxBlackViewAlpha
      }, completion: { (complete) in

          // disable the screen edge pan gesture when menu is fully opened
          self.gestureScreenEdgePan.isEnabled = false
      })
  }

  func hideMenu() {

      // when menu is closed, it's left constraint should be of value that allows it to be completely hidden to the left of the screen - which is negative value of it's width
      constraintMenuLeft.constant = -constraintMenuWidth.constant

      // animate closing of the menu - including opacity value
      UIView.animate(withDuration: 0.3, animations: {
          self.view.layoutIfNeeded()
          self.viewBlack.alpha = 0
      }, completion: { (complete) in

          // reenable the screen edge pan gesture so we can detect it next time
          self.gestureScreenEdgePan.isEnabled = true

          // hide the view for dimming effect so it wont interrupt touches for views underneath it
          self.viewBlack.isHidden = true
      })
  }