Using IBAction Buttons to Zoom MapView

Question

I have an issue. My current location is displayed and centered in a map view however the map region doesn\'t get zoomed in to. I tried taking Rob\'s advice by taking span an

Answer 1

Swift 3:

import GoogleMaps
import GooglePlaces
import CoreLocation
import UIKit

class LocationMapView: UIViewController, GMSMapViewDelegate, CLLocationManagerDelegate {

     @IBOutlet weak var mapView: GMSMapView!

     var mapViewZoomStepperValue: Float = 0.0
     @IBOutlet weak var mapViewZoomStepper: UIStepper!

     override func viewDidLoad() {
            super.viewDidLoad()

            mapViewZoomStepper.minimumValue = -100

        }

        @IBAction func mapViewZoomStepperValueChanged(_ sender: Any) {

            if (Float(mapViewZoomStepper.value) > mapViewZoomStepperValue){

                mapViewZoomStepperValue = Float(mapViewZoomStepper.value)
                zoomIn()

            }else{

                mapViewZoomStepperValue = Float(mapViewZoomStepper.value)
                zoomOut()

            }

        }

        func zoomIn() {

            print("Zoom in!!")
            if mapView.camera.zoom == mapView.maxZoom {
                return
            }

            let currentZoom = mapView.camera.zoom + 1
            mapViewZoomController(currentZoom)

        }

        func zoomOut() {

            print("Zoom out!!")
            if mapView.camera.zoom == mapView.minZoom {
                return
            }

            let currentZoom = mapView.camera.zoom - 1
            mapViewZoomController(currentZoom)

        }

        func mapViewZoomController(_ level: Float) {

            let point: CGPoint = mapView.center
            let coor: CLLocationCoordinate2D = mapView.projection.coordinate(for: point)
            let camera = GMSCameraPosition.camera(withLatitude: coor.latitude, longitude: coor.longitude, zoom: Float(level))
            mapView.animate(to: camera)

        }

}