ig-zoom-3.swift

// ... ViewController

// Let's start
override func viewDidLoad() {
  super.viewDidLoad()

  // Do not forget to enable user interaction on our imageView
  imageView.isUserInteractionEnabled = true
  
  let pinch = UIPinchGestureRecognizer(target: self, action: #selector(handlePinchGesture))
  let pan = UIPanGestureRecognizer(target: self, action: #selector(handlePanGesture))
  
  // Use 2 thingers to move the view
  pan.minimumNumberOfTouches = 2
  pan.maximumNumberOfTouches = 2
  
  // We delegate gestures so we can 
  // perform both at the same time
  pan.delegate = self
  pinch.delegate = self
  
  // Add the gestures to our target (imageView)
  imageView.addGestureRecognizer(pinch)
  imageView.addGestureRecognizer(pan)
  
  // Here some basic setup
  view.addSubView(overlay)
  view.bringSubViewToFront(imageView)
}