map scalebar in ios api

HumzaAkhtar — Tue, 05 Mar 2013 00:31:51 GMT

Hi all,

I could not find any map scale bar in the reference of iOS api? Does 10.1.1 sdk doesnot have this capability to add a scale bar unlike SDK for WPF or SDK for java script?

Thanks

Re: map scalebar in ios api

NimeshJarecha — Thu, 28 Mar 2013 20:06:11 GMT

No, SDK does not provide scale bar. You'll have to write your own.

Regards,
Nimesh

Re: map scalebar in ios api

AkhilChoran_Balan — Tue, 15 Sep 2015 19:51:05 GMT

Just wondering if this is still not available. Anyone has any solution on how to do this?

Re: map scalebar in ios api

ShiminCai — Thu, 17 Sep 2015 00:26:46 GMT

Hi Akhil,

I was also looking for a scalebar solution in the forum but couldn't find any. So I did a very simple scalebar (see the attached image).

The idea is to use a fixed-width image view to show a scalebar image. Then calculate the width of the image view in map unit which is map scale dependent. In another word the width of the image view represents different map distances at different map scales.

override func viewDidLoad()

{

super.viewDidLoad()

// Do any additional setup after loading the view, typically from a nib.

// set up and load your map here

//Register map pan and zoom notifications for scale bar

NSNotificationCenter.defaultCenter().addObserver(self, selector: "mapViewDidEndPanningZooming", name: AGSMapViewDidEndZoomingNotification, object: nil)

NSNotificationCenter.defaultCenter().addObserver(self, selector: "mapViewDidEndPanningZooming", name: AGSMapViewDidEndPanningNotification, object: nil)

// the reason to register the AGSMapViewDidEndPanningNotification is to account for the device rotations.

}

func mapViewDidEndPanningZooming()

{

//Scale

var formatter = NSNumberFormatter()

formatter.numberStyle = NSNumberFormatterStyle.DecimalStyle

let groupingSeparator: String! = NSLocale.currentLocale().objectForKey(NSLocaleGroupingSeparator) as! String

formatter.groupingSeparator = groupingSeparator

formatter.groupingSize = 3

formatter.alwaysShowsDecimalSeparator = false

formatter.usesGroupingSeparator = true

var scale: Double = round(self.mapView.mapScale)

self.scaleLabel.text = "1 : " + formatter.stringFromNumber(NSNumber(double: scale))!

//Scale bar

let screenPointStart = CGPoint(x: self.scalebar.frame.origin.x, y: self.scalebar.frame.origin.y)

let mapPointStart = self.mapView.toMapPoint(screenPointStart)

let screenPointEnd = CGPoint(x: self.scalebar.frame.origin.x + self.scalebar.frame.size.width, y: self.scalebar.frame.origin.y)

let mapPointEnd = self.mapView.toMapPoint(screenPointEnd)

let ge = AGSGeometryEngine.defaultGeometryEngine()

var distance = ge.distanceFromGeometry(mapPointStart, toGeometry: mapPointEnd)

//the distance calculated here is in metres with the spatial reference GDA 1994 New South Wales Lambert

if(distance > 10000) //10km

{

//show the labels in km

self.scalebarMiddleLabel.text = String(format:"%0.0f", distance/2000)

self.scalebarEndLabel.text = String(format:"%0.0f km", distance/1000)

}

else

{

//show the labels in m

self.scalebarMiddleLabel.text = String(format:"%0.0f", distance/2)

self.scalebarEndLabel.text = String(format:"%0.0f m", distance)

}

Hope it helps.

Shimin

Re: map scalebar in ios api

AkhilChoran_Balan — Thu, 17 Sep 2015 18:55:03 GMT

Thanks for the help Shimin. I will check with this.

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