toggle basemap layer?

Question

Hi,

I am trying to toggle between two base map layers, i.e. I am using segmented tool to switch from one base layer let's say street view to satellite view. I am not quite sure if I can use VisibleLayer property while using AGSTiledMapLayer and also if I can then how to use this property?. Please give me an example since I am fairly new on ArcGis.

Regards
Rao
GeoSurfInc.

BradyHoak · Answer

This seems to work OK:

- (void)viewDidLoad {
    [super viewDidLoad];
 
 // set the delegate for the map view
 self.mapView.mapViewDelegate = self;
 
 //create an instance of a tiled map service lay
 
 self.tiledBasemapLayer = [[AGSTiledMapServiceLayer alloc] initWithURL:[NSURL URLWithString:@"http://server.arcgisonline.com/ArcGIS/rest/services/World_Topo_Map/MapServer"]];

[self.mapView addMapLayer:self.tiledBasemapLayer withName:@Basemap1];
 //release to avoid memory leaks
 [self.tiledBasemapLayer release];

//create an instance of a dynmaic map layer
 self.dynamicLayer = [[[AGSDynamicMapServiceLayer alloc] initWithURL:[NSURL URLWithString:kDynamicMapServiceURL]] autorelease];

//name the layer. This is the name that is displayed if there was a property page, tocs, etc...
 self.dynamicLayerView = [self.mapView addMapLayer:self.dynamicLayer withName:@Layer1];

//set transparency
 self.dynamicLayerView.alpha = 1.0;

// create and add the graphics layer to the map
 self.graphicsLayer = [AGSGraphicsLayer graphicsLayer];
 [self.mapView addMapLayer:self.graphicsLayer withName:@Graphics Layer];
}

to toggle the basemap there is a button that sets a new basmapurl

NSString *newBasemapURL = (your rest url)
 
 if (newBasemapURL != nil) {

//idea is that we have one basemap at all times, and its either called Basemap1 or Basemap2
  //the basemap is always at index 0
  
  //when the app starts we have one basemap at index 0 called Basemap1 and
  //a dynamic layer on top at index 1
  
  //Note that if you remove the current basemap before inserting the new one, the dynmaic layer will be under the new basemap,
  //so we need to add the new one at index 0, then remove the old basemap using its unique name
  
  //create new tilelayer for new basemap
  self.tiledBasemapLayer = [[AGSTiledMapServiceLayer alloc] initWithURL:[NSURL URLWithString:newBasemapURL]];
  
  //create a string to compare name of current basemap to
  NSString *baseMapStr = @Basemap1;
  
  //get the names of the layers in the map
  NSArray *myLyrArray = [self.mapView mapLayerNames];
  
  //print out the names of the layers to the log 
  NSLog(@array: %@", myLyrArray);

//see if the current basemap is called Basemap1
  if ([baseMapStr isEqualToString:[myLyrArray objectAtIndex:0]]) {  
   [self.mapView insertMapLayer:self.tiledBasemapLayer withName:@Basemap2 atIndex:0];
   [self.mapView removeMapLayerWithName:@Basemap1]; 
  }
  else { //its called basemap2 then ....
   [self.mapView insertMapLayer:self.tiledBasemapLayer withName:@Basemap1 atIndex:0];
   [self.mapView removeMapLayerWithName:@Basemap2]; 
  } 
  
  [self.tiledBasemapLayer release];
   
 }

ManojrajTeli · Answer

I have more than 4 layers in my web app but i want to toggle between only two layers how do i do this using checkbox or radio button.I tried using javascript and c# both the time i was unsuccessful.

AkhlaqRao · Answer

Thanks!, but the idea is not to have more than one TiledMapLayer loaded at a time. Yes, I've tried the alphaSlider property and NO LUCK. So far, the solution I came up it's working pretty good I only need to use Zombies to clear the Object references which it creates on every single toggle. I am interested to know how can I instantiate an object of TiledMapLayer in .h and initialize it in implement .m class. I can do it very easilly when I am using feature layers such graphics layer, but I am not sure how to do it using TiledMapLayer which can save my whole lots memory and avoid crushing the program.

@interface.......{
AGSTileMapServiceLayer *LayerName;
 }
@property......... AGSTileMapServiceLayer *LayerName;
@end

@implement
@synthesize AGSTileMapServiceLayer LayerName;

-(void) viewDidLoad{
I've tried couple other ways but none of them worked. 
CAN SOMEONE PLEASE COMPLETE THIS FOR ME BY INITIALIZING THEN ADDING AGSTiledMapLayer?
}

Regards
Rao
GeoSurfInc.