wms_ios_googlemapsdk's Introduction

WMS_iOS_GoogleMapSDK

Sample for using WMS sources in Google Maps SDK for iOS. Provide your API key in the WMSController.h

Google Maps for iOS used : 1.7.2 (April 2014)
used XCode 5.1.1 (April 2014)
iPad Air, iOS 7.1 (should run in iOS6.0 too)

There are two ways of doing this:

"Method B": use GMSTileURLConstructor

     // -- method B. WMS tile layer with GMSTileURLConstructor
        GMSTileURLConstructor urls = ^(NSUInteger x, NSUInteger y, NSUInteger z) {
            BBox bbox = bboxFromXYZ(x,y,z);
            NSString *urlKN = [NSString stringWithFormat:@"Your WMS url&BBOX=%f,%f,%f,%f",
                               bbox.left, bbox.bottom,bbox.right,bbox.top];
            
            return [NSURL URLWithString:urlKN];
        };

"Method A": use custom TileLayer derived from GMSTileLayer

your derived class from GMSTileLayer (here WMSTileLayer.h) will receive tile request

   -(void)requestTileForX:(NSUInteger)x   y:(NSUInteger)y    zoom:(NSUInteger)z    receiver:(id<GMSTileReceiver>)receiver

WMSTileLayer first checks for cached tile and if found calls :

    [self drawTileAtX:x y:y zoom:z Url:urlStr Receiver:receiver] ;

if tile is not cached we download it, save it to the file system (using MD5 hash) and call to draw it

    [data  writeToFile: filePath  atomically:YES];
    [self drawTileAtX:x y: y zoom: z Url:urlStr Receiver:receiver] ;

drawTileAtX is very simple:

    -(void) drawTileAtX: (NSUInteger) x   y:(NSUInteger)y    zoom:(NSUInteger)zoom   Url:(NSString*) url Receiver: (id<GMSTileReceiver>) receiver {
         UIImage             *image   = TileLoad(url,NO); // loads tile from file system
         [receiver receiveTileWithX:x y:y zoom:zoom image:image]; // pass it to the SDK API
    }

}

both ways are used in this sample.

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