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 2.0:

Using Extension :

extension MKMapView{

 func zoomInPinAnnotationLocation(targetMapViewName : MKMapView?, delta: Double)
 {
  var region: MKCoordinateRegion = targetMapViewName!.region
  region.span.latitudeDelta /= delta
  region.span.longitudeDelta /= delta
  targetMapViewName!.region = region

 }
 func zoomOutPinAnnotationLocation(targetMapViewName : MKMapView?,delta: Double)
 {
  var region: MKCoordinateRegion = targetMapViewName!.region
  region.span.latitudeDelta *= delta
  region.span.longitudeDelta *= delta
  targetMapViewName!.region = region
 }

}

Usage:

var mapViewZoomStepperValue: Double = -1.0
@IBOutlet weak var mapViewZoomStepper: UIStepper!

@IBAction func mapViewZoomStepperValueChanged(sender: AnyObject) {

  if (mapViewZoomStepper.value  > mapViewZoomStepperValue)
  {
   mapViewZoomStepperValue = mapViewZoomStepperValue + 1.0

//Zoom In
   detailMapView.zoomInPinAnnotationLocation(detailMapView, delta: 3.0)
  }
  else
  {
   mapViewZoomStepperValue = mapViewZoomStepper.value - 1.0

//Zoom Out
   detailMapView.zoomOutPinAnnotationLocation(detailMapView, delta: 3.0)
  }

 }