Setting the zoom level for a MKMapView

Question

I have a map which shows correctly  the only thing I want to do now is set the zoom level when it loads  Is there a way to do this   Thanks

User · Answer

Based on  AdilSoomro s great answer  I have come up with this    interface MKMapView  ZoomLevel  -  void setCenterCoordinate  CLLocationCoordinate2D centerCoordinate                   zoomLevel  NSUInteger zoomLevel                    animated  BOOL animated   - double  getZoomLevel   end     implementation MKMapView  ZoomLevel   -  void setCenterCoordinate  CLLocationCoordinate2D centerCoordinate                   zoomLevel  NSUInteger zoomLevel animated  BOOL animated       MKCoordinateSpan span   MKCoordinateSpanMake 0  360 pow 2  zoomLevel  self frame size width 256        self setRegion MKCoordinateRegionMake centerCoordinate  span  animated animated       - double  getZoomLevel       return log2 360     self frame size width 256    self region span longitudeDelta        end

User · Answer

I know this is a late reply  but I ve just wanted to address the issue of setting the zoom level myself  goldmine s answer is great but I found it not working sufficiently well in my application   On closer inspection goldmine states that  longitude lines are spaced apart equally at any point of the map   This is not true  it is in fact latitude lines that are spaced equally from -90  south pole  to  90  north pole   Longitude lines are spaced at their widest at the equator  converging to a point at the poles   The implementation I have adopted is therefore to use the latitude calculation as follows    implementation MKMapView  ZoomLevel   -  void setCenterCoordinate  CLLocationCoordinate2D coordinate     zoomLevel  NSUInteger zoom animated  BOOL animated       MKCoordinateSpan span   MKCoordinateSpanMake 180   pow 2  zoom             self frame size height   256  0        self setRegion MKCoordinateRegionMake coordinate  span  animated animated       end   Hope it helps at this late stage

User · Answer

It s not built in  but I ve seen   used this code   This allows you to use this    mapView setCenterCoordinate myCoord zoomLevel 13 animated YES     Note  This is not my code  I did not write it  so therefore can t take credit for it

User · Answer

For Swift 3 it s pretty fast forward   private func setMapRegion for location  CLLocationCoordinate2D  animated  Bool        let viewRegion   MKCoordinateRegionMakeWithDistance location   lt  T  latitudinalMeters  CLLocationDistance  CLLocationDistance  gt    lt  T  longitudinalMeters  CLLocationDistance  CLLocationDistance  gt       MapView setRegion viewRegion  animated  animated      Just define the lat-  long-Meters  lt CLLocationDistance gt  and the mapView will fit the zoom level to your values

User · Answer

Here  I put my answer and its working for swift 4 2   MKMapView center and zoom in

User · Answer

Swift   Map setRegion MKCoordinateRegion center  locValue  latitudinalMeters  200  longitudinalMeters  200   animated  true    locValue is your coordinate

User · Answer

You can also zoom by using MKCoordinateRegion and setting its span latitude  amp  longitude delta   Below is a quick reference and here is the iOS reference   It won t do anything fancy but should allow you to set zoom when it draws the map     MKCoordinateRegion region  region center latitude    desired lat   region center longitude    desired lng   region span latitudeDelta   1  region span longitudeDelta   1  mapView region   region      Edit 1   MKCoordinateRegion region  region center latitude    desired lat   region center longitude    desired lng   region span latitudeDelta   1  region span longitudeDelta   1  region    mapView regionThatFits region    mapView setRegion region animated TRUE

User · Answer

I found myself a solution  which is very simple and does the trick  Use MKCoordinateRegionMakeWithDistance in order to set the distance in meters vertically and horizontally to get the desired zoom  And then of course when you update your location you ll get the right coordinates  or you can specify it directly in the CLLocationCoordinate2D at startup  if that s what you need to do   CLLocationCoordinate2D noLocation  MKCoordinateRegion viewRegion   MKCoordinateRegionMakeWithDistance noLocation  500  500   MKCoordinateRegion adjustedRegion    self mapView regionThatFits viewRegion              self mapView setRegion adjustedRegion animated YES   self mapView showsUserLocation   YES    Swift   let location       let region   MKCoordinateRegion  center  location coordinate  latitudinalMeters  CLLocationDistance exactly  5000    longitudinalMeters  CLLocationDistance exactly  5000    mapView setRegion mapView regionThatFits region   animated  true

User · Answer

Swift implementation  import Foundation import MapKit  class MapViewWithZoom  MKMapView        var zoomLevel  Int           get               return Int log2 360    Double self frame size width 256    self region span longitudeDelta     1                      set  newZoomLevel               setCenterCoordinate coordinate self centerCoordinate  zoomLevel  newZoomLevel  animated  false                       private func setCenterCoordinate coordinate  CLLocationCoordinate2D  zoomLevel  Int  animated  Bool            let span   MKCoordinateSpan latitudeDelta  0  longitudeDelta  360   pow 2  Double zoomLevel     Double self frame size width    256          setRegion MKCoordinateRegion center  coordinate  span  span   animated  animated

User · Answer

I hope following code fragment would help you   -  void handleZoomOutAction  id sender       MKCoordinateRegion newRegion MKCoordinateRegionMake mapView region center MKCoordinateSpanMake mapView region s       pan latitudeDelta 0 5  mapView region span longitudeDelta 0 5         mapView setRegion newRegion       -  void handleZoomInAction  id sender       MKCoordinateRegion newRegion MKCoordinateRegionMake mapView region center MKCoordinateSpanMake mapView region span latitudeDelta 0 5  mapView region span longitudeDelta 0 5         mapView setRegion newRegion       You can choose any value in stead of 0 5 to reduce or increase zoom level  I have used these methods on click of two buttons

User · Answer

A simple Swift implementation  if you use outlets     IBOutlet weak var mapView  MKMapView        didSet           let noLocation   CLLocationCoordinate2D           let viewRegion   MKCoordinateRegionMakeWithDistance noLocation  500  500          self mapView setRegion viewRegion  animated  false            Based on  Carnal s answer

User · Answer

MKMapView extension based on this answer    floating-point zoom level accuracy   import Foundation import MapKit  extension MKMapView       var zoomLevel  Double           get               return log2 360    Double self frame size width   256    self region span longitudeDelta     1                    set  newZoomLevel               setCenterCoordinate coordinate self centerCoordinate  zoomLevel  newZoomLevel  animated  false                       private func setCenterCoordinate coordinate  CLLocationCoordinate2D  zoomLevel  Double  animated  Bool            let span   MKCoordinateSpan latitudeDelta  0  longitudeDelta  360   pow 2  zoomLevel    Double self frame size width    256          setRegion MKCoordinateRegion center  coordinate  span  span   animated  animated

User · Answer

Based on the fact that longitude lines are spaced apart equally at any point of the map  there is a very simple implementation to set the centerCoordinate and zoomLevel    interface MKMapView  ZoomLevel    property  assign  nonatomic  NSUInteger zoomLevel   -  void setCenterCoordinate  CLLocationCoordinate2D centerCoordinate                   zoomLevel  NSUInteger zoomLevel                    animated  BOOL animated    end    implementation MKMapView  ZoomLevel   -  void setZoomLevel  NSUInteger zoomLevel        self setCenterCoordinate self centerCoordinate zoomLevel zoomLevel animated NO      -  NSUInteger zoomLevel       return log2 360     self frame size width 256    self region span longitudeDelta     1     -  void setCenterCoordinate  CLLocationCoordinate2D centerCoordinate zoomLevel  NSUInteger zoomLevel animated  BOOL animated       MKCoordinateSpan span   MKCoordinateSpanMake 0  360 pow 2  zoomLevel  self frame size width 256        self setRegion MKCoordinateRegionMake centerCoordinate  span  animated animated       end

User · Answer

A Swift 2 0 answer utilising NSUserDefaults to save and restore the map s zoom and position   Function to save the map position and zoom   func saveMapRegion         let mapRegion              latitude    mapView region center latitude           longitude    mapView region center longitude           latitudeDelta    mapView region span latitudeDelta           longitudeDelta    mapView region span longitudeDelta           NSUserDefaults standardUserDefaults   setObject mapRegion  forKey   mapRegion       Run the function each time the map is moved   func mapView mapView  MKMapView  regionDidChangeAnimated animated  Bool             saveMapRegion        Function to save the map zoom and position   func restoreMapRegion          if let mapRegion   NSUserDefaults standardUserDefaults   objectForKey  mapRegion                   let longitude   mapRegion  longitude   as  CLLocationDegrees         let latitude   mapRegion  latitude   as  CLLocationDegrees         let center   CLLocationCoordinate2D latitude  latitude  longitude  longitude           let longitudeDelta   mapRegion  latitudeDelta   as  CLLocationDegrees         let latitudeDelta   mapRegion  longitudeDelta   as  CLLocationDegrees         let span   MKCoordinateSpan latitudeDelta  latitudeDelta  longitudeDelta  longitudeDelta           let savedRegion   MKCoordinateRegion center  center  span  span           self mapView setRegion savedRegion  animated  false            Add this to viewDidLoad   restoreMapRegion

User · Answer

Based on quentinadam s answer  Swift 5 1     size refers to the width height of your tile images  by default is 256 0    Seems to get better results using round      frame width is the width of the MKMapView  let zoom   round log2 360   Double frame width    size   region span longitudeDelta

[iphone] Setting the zoom level for a MKMapView

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