more tile cache key instance fixes

@@ -33,6 +33,7 @@
 {
     NSString *_mapsKey;
     NSString *_imageURLString;
+    NSString *_uniqueTilecacheKey;
     RMBingImagerySet _imagerySet;
 }
 
@@ -49,6 +50,8 @@
 
         _imagerySet = imagerySet;
 
+        _uniqueTilecacheKey = [NSString stringWithFormat:@"Bing%lu", (unsigned long)_imagerySet];
+
         self.minZoom = 1;
         self.maxZoom = 21;
 
@@ -123,7 +126,7 @@
 
 - (NSString *)uniqueTilecacheKey
 {
-	return [NSString stringWithFormat:@"Bing%lu", (unsigned long)_imagerySet];
+	return _uniqueTilecacheKey;
 }
 
 - (NSString *)shortName

@@ -42,6 +42,7 @@
 @implementation RMMBTilesSource
 {
     RMFractalTileProjection *tileProjection;
+    NSString *_uniqueTilecacheKey;
 }
 
 @synthesize cacheable = _cacheable, opaque = _opaque;
@@ -71,6 +72,8 @@
     if ( ! queue)
         return nil;
 
+    _uniqueTilecacheKey = [NSString stringWithFormat:@"MBTiles%@", [queue.path lastPathComponent]];
+
     [queue inDatabase:^(FMDatabase *db) {
         [db setShouldCacheStatements:YES];
     }];
@@ -330,7 +333,7 @@
 
 - (NSString *)uniqueTilecacheKey
 {
-    return [NSString stringWithFormat:@"MBTiles%@", [queue.path lastPathComponent]];
+    return _uniqueTilecacheKey;
 }
 
 - (NSString *)shortName

@@ -41,7 +41,7 @@
 
 @property (nonatomic, strong) NSDictionary *infoDictionary;
 @property (nonatomic, strong) NSString *tileJSON;
-@property (nonatomic, strong) NSString *cacheKey;
+@property (nonatomic, strong) NSString *uniqueTilecacheKey;
 
 @end
 
@@ -49,7 +49,7 @@
 
 @implementation RMMapboxSource
 
-@synthesize infoDictionary=_infoDictionary, tileJSON=_tileJSON, imageQuality=_imageQuality, dataQueue=_dataQueue;
+@synthesize infoDictionary=_infoDictionary, tileJSON=_tileJSON, imageQuality=_imageQuality, dataQueue=_dataQueue, uniqueTilecacheKey=_uniqueTilecacheKey;
 
 - (id)init
 {
@@ -85,7 +85,7 @@
 
         _tileJSON = tileJSON;
 
-        _cacheKey = [NSString stringWithFormat:@"Mapbox-%@%@", [_infoDictionary objectForKey:@"id"], ([_infoDictionary objectForKey:@"version"] ? [@"-" stringByAppendingString:[_infoDictionary objectForKey:@"version"]] : @"")];
+        _uniqueTilecacheKey = [NSString stringWithFormat:@"Mapbox-%@%@", [_infoDictionary objectForKey:@"id"], ([_infoDictionary objectForKey:@"version"] ? [@"-" stringByAppendingString:[_infoDictionary objectForKey:@"version"]] : @"")];
 
         id dataObject = nil;
         
@@ -355,7 +355,7 @@
 
 - (NSString *)uniqueTilecacheKey
 {
-    return self.cacheKey;
+    return self.uniqueTilecacheKey;
 }
 
 - (NSString *)shortName