iOS Google map SDK: Setting maxZoom level issue -

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i notice when set max zoom level of example 19, zoom go 20. don't know why. it's 1 more zoom level 1 set.

gmscameraposition *camera = [gmscameraposition camerawithlatitude:23.589571946369546                                                         longitude:58.14204730042655                                                              zoom:16];  self.mapview_.camera=camera; self.mapview_.mylocationenabled = yes;   self.mapview_.maptype = kgmstypehybrid; self.mapview_.settings.compassbutton = yes; [self.mapview_ setminzoom:5 maxzoom:19];    // creates marker in center of map. gmsmarker *marker = [[gmsmarker alloc] init]; marker.position = cllocationcoordinate2dmake(23.168520, 58.008163);  marker.map = self.mapview_; // ------ add layer // implement gmstileurlconstructor // returns tile based on x,y,zoom coordinates, , requested floor gmstileurlconstructor urls = ^(nsuinteger x, nsuinteger y, nsuinteger zoom) {     nsstring *url = [nsstring stringwithformat:@"http://www.example.com/%tu/%tu/%tu.png", zoom, x, y];     nslog(@"url=%@",url);     return [nsurl urlwithstring:url]; };

how find out maxzoom 20? version of ios maps sdk use?

i tried sample hello map application google maps' github page ios maps sdk version 1.9.1 , put below code in videdidload() method. prints correct max zoom 19.

gmscameraposition *camera = [gmscameraposition camerawithlatitude:23.589571946369546                                                             longitude:58.14204730042655                                                                  zoom:16];      mapview_.camera=camera;     mapview_.mylocationenabled = yes;      mapview_.maptype = kgmstypehybrid;     mapview_.settings.compassbutton = yes;      // create gmsmapview camera position.     mapview_ = [gmsmapview mapwithframe:cgrectzero camera:camera];      [mapview_ setminzoom:5 maxzoom:19];      nslog(@"max zoom: %f", mapview_.maxzoom);

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