map move.swift

	var startPoint = CGPoint.zero
	var startCoord = CLLocationCoordinate2D(latitude: 48.8582, longitude: 2.2945)
	
	@IBAction func didPan(_ sender: Any) {
		
		if let recognizer = sender as? UIPanGestureRecognizer {
			
      // translate touch to local view
			let trans = recognizer.translation(in: recognizer.view)
			
			switch recognizer.state {
        
        // when PAN begins, save the firstTouchPoint in the touched view, and save the current map center
			case .began:
				startPoint = trans
				startCoord = mapView.centerCoordinate
				break
				
        // when PAN moves, get the distance from the start touch point, add that to the latitude of the saved coord, and set the new map region
			case .changed:
				let delta = startPoint.x - trans.x
				let newCoord = CLLocationCoordinate2D(latitude: startCoord.latitude + Double(delta / 1000), longitude: startCoord.longitude)
				let region = MKCoordinateRegionMakeWithDistance(newCoord, 0.1, 0.1)
				self.mapView.setRegion(region, animated: false)
				break
				
			default:
				break
				
			}
			
		}
		
	}