topic Re: Adding Map Layers in ArcGIS Runtime SDK for iOS Questions

Adding Map Layers

JeffPapirtis — Mon, 14 Jun 2010 13:17:22 GMT

Since ESRI documentation on the Beta SDK is still a work in progress, can any one give me some help on adding individual map layers from a rest service? I am pretty solid on adding the map service from the documentation thus far, but am not exactly sure on how to impelement individual layers within the map.

Ex: basemap rest service
(3) = roads

"http://server.maphost_example/ArcGIS/rest/services/basemap/MapServer/3"

I just want to add one layer from my map service.

Any Ideas?

Thanks in advance!

Re: Adding Map Layers

JeremyBixby — Sun, 12 Dec 2021 00:29:55 GMT

Use the addLayer method. For example, this is from the header file from a map nib I have:

-(void) addLenexaTiledMapLayer:(NSString*)layerURL:(NSString*) lyrName;
-(void) addLenexaTiledMapLayerURL:(NSURL*)layerURL:(NSString*) lyrName;
-(void) removeLenexaMapLayer:(NSString*)layerName;
-(void) addLenexaDynamicMapLayer:(NSString*)layerURL:(NSString*) lyrName;

And here is the implementations of said functions, in the .m file:

-(void) addLenexaTiledMapLayerURL:(NSURL*)layerURL:(NSString*)lyrName{
 
 AGSTiledMapServiceLayer *tiledMapLyr = [[AGSTiledMapServiceLayer alloc] initWithURL:layerURL];
 [mapView addMapLayer:tiledMapLyr withName:lyrName];
 [tiledMapLyr release];
 
}

-(void) addLenexaTiledMapLayer:(NSString*)layerURL:(NSString*)lyrName{
 
 AGSTiledMapServiceLayer *tiledMapLyr = [[AGSTiledMapServiceLayer alloc] initWithURL:[NSURL URLWithString:layerURL]];
 [mapView addMapLayer:tiledMapLyr withName:lyrName];
 [tiledMapLyr release];

}
-(void) removeLenexaMapLayer:(NSString*)layerURL:(NSString*)lyrName{
 [mapView removeMapLayerWithName:lyrName];
}
-(void) addLenexaDynamicMapLayer:(NSString*)layerURL:(NSString*)lyrName{

 AGSDynamicMapServiceLayer *dynaMapLyr = [[AGSDynamicMapServiceLayer alloc] initWithURL:[NSURL URLWithString:layerURL]];
 dynaMapLyr.dpi = 96;
 [mapView addMapLayer:dynaMapLyr withName:lyrName];
 
 [dynaMapLyr release];
 
}

and then if you want to access the layer once it's been added to the map, use the appropriate layerview object:

 AGSTiledLayerView *basemapView = [self.mapView.mapLayerViews objectForKey:@"myBasemap"];
 basemapView.alpha = self.mySlider.value;

Re: Adding Map Layers

NimeshJarecha — Tue, 15 Jun 2010 14:35:27 GMT

The 1st layer (base layer) should be a tiled layer and then you�??ll be able to add your map service layers on top of it.

Regards,
Nimesh

Re: Adding Map Layers

DiveshGoyal — Wed, 16 Jun 2010 16:14:36 GMT

Jeff,

You cannot selectively add only one layer from your map service. You have to add the entire map service.

If you add the map service as a AGSDynamicMapServiceLayer, you can set it's visibleLayers property to only display the layer you want.

Hope this helps.

Re: Adding Map Layers

JeffPapirtis — Thu, 17 Jun 2010 21:48:31 GMT

Thanks Divesh,
I have all of my map services added, two tiled, and one Dynamic, but I am not sure what the proper syntax is to acomplish what is visible within the mapView within the dynamic map service.

Where and how would the visibleLayers property be set?

Will I need to set up an array with the layers that are present in the rest service?

I appologize if I am not following, but I am very new at this.

Thanks

Re: Adding Map Layers

NimeshJarecha — Fri, 18 Jun 2010 14:57:05 GMT

Jeff,

Just before adding a layer to map view, add following line to set the visible layer.

dynamicLayer.visibleLayers = [NSArray arrayWithObjects:[NSNumber numberWithInt:0], nil];

Nimesh

Re: Adding Map Layers

JeffPapirtis — Fri, 18 Jun 2010 19:59:03 GMT

Thanks Nimesh!
after a lot of metal lifting I was able to load only the layers I wanted using the NSArray and your advice. For everyone else interested I will post my solution this weekend.

Thanks Nimesh!!!!

Re: Adding Map Layers

KOLDODUARTE — Tue, 22 Jun 2010 09:00:38 GMT

Finally, What was your solution?

Thanks !

Re: Adding Map Layers

JeffPapirtis — Tue, 22 Jun 2010 13:04:56 GMT

ok, sorry for the delay.

Some real code, I am still figuring out how to read the documentation code, so looking at something that actually works in code helps me a lot.

//Code below creates an array with the different layers within a dynamic service.

GSDynamicMapServiceLayer *facilityLayer = [[AGSDynamicMapServiceLayer alloc]
           initWithURL:[NSURL URLWithString:@"http://gis.shh.noaa.gov/ArcGIS.rest/services/coop/MapServer"]];

//define varible, initiate & populate the array.
NSArray *dynamicLayer;
dynamicLayer =[[NSArray alloc] initWithObjects:
       [NSNumber numberWithInt:0],
       [NSNumber numberWithInt:1],
       [NSNumber numberWithInt:2],
       [NSNumber numberWithInt:3],
       [NSNumber numberWithInt:4],
       [NSNumber numberWithInt:5],
       [NSNumber numberWithInt:6],
       [NSNumber numberWithInt:7],
       [NSNumber numberWithInt:8],
       [NSNumber numberWithInt:9],
       [NSNumber numberWithInt:10],
       [NSNumber numberWithInt:11],
       [NSNumber numberWithInt:12],
       nil
       ];
//set the facility layer visible layers property to equal the array.

facilityLayer.visibleLayers=dynamicLayer;
}

self.facilityView = [self.mapView addMapLayer:facilityLayer withName:@"dynamicLayer"];

[facilityLayer release];

So in order to show only certain layers just remove the corresponding value in the array.
example if 20 mile grid in the NOAA rest service is ....MapServer/8" then to remove the line in the array that defines that particular layer.

This is by no means a final working solution, but hopefully it will help to understand some of the structure behind it.

Re: Adding Map Layers

KOLDODUARTE — Thu, 24 Jun 2010 16:14:37 GMT

Thank jpapirti !

I have the same problem, I hope to resolve with you solution !

Regards.

Re: Adding Map Layers

DarrenMackiewicz — Thu, 08 Dec 2011 19:23:23 GMT

My question is :
Do you have to remove the entire DynamicMapLayer each time you want to change the visible layers on the fly? (as in, I've already created the dynamicmaplayer and added it to the mapView.Now I want to make a change to the visible layers in the middle of running the app)

So, Do I have to do this entire process of removing the layer either by reset or removing it by name, recreating it, and adding it back in?

[self.mapView reset];

Then rebuild the AGSDynamicMapServiceLayer and addit to the

    self.baseDynamicLayer = [[[AGSDynamicMapServiceLayer alloc] initWithMapServiceInfo:bms]autorelease];

    self.baseDynamicLayer.visibleLayers = [NSArray arrayWithObjects:[NSNumber numberWithInt:2], nil];

[self.mapView addMapLayer:baseDynamicLayer withName:@"baseLayer"];

Or - is there a better way I can accomplish changing visible layers without REMOVING the AGSDynamicMapServiceLayer from the mapView and adding back in ?

Re: Adding Map Layers

NimeshJarecha — Thu, 08 Dec 2011 19:30:16 GMT

No, you do not need to remove the layer and add it back in order to change the visibleLayers. Just setting the self.baseDynamicLayer.visibleLayers with desired visible layers is enough.

Regards,
Nimesh

Re: Adding Map Layers

DarrenMackiewicz — Thu, 08 Dec 2011 19:57:05 GMT

Confirmed.
Thanks Nimesh!