improvements to asset assertions

@@ -21,7 +21,8 @@
 
     if (self)
     {
-        NSAssert([[NSBundle mainBundle] pathForResource:@"LoadingTile" ofType:@"png"], @"Unable to find necessary graphical assets (copy from framework 'Resources' folder)");
+        RMRequireAsset(@"LoadingTile.png");
+        RMRequireAsset(@"LoadingTileZoom.png");
 
         _contentView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, frame.size.width * 3, frame.size.height * 3)];
         [self addSubview:_contentView];

@@ -2638,6 +2638,12 @@
 
     if (newShowsUserLocation)
     {
+        RMRequireAsset(@"HeadingAngleSmall.png");
+        RMRequireAsset(@"TrackingDot.png");
+        RMRequireAsset(@"TrackingDotHalo.png");
+        RMRequireAsset(@"TrackingHeading.png");
+        RMRequireAsset(@"TrackingLocation.png");
+
         if (_delegateHasWillStartLocatingUser)
             [_delegate mapViewWillStartLocatingUser:self];
 

@@ -21,8 +21,6 @@
     if ( ! (self = [super initWithMapView:aMapView coordinate:aCoordinate andTitle:aTitle]))
         return nil;
 
-    NSAssert([[NSBundle mainBundle] pathForResource:@"TrackingDot" ofType:@"png"], @"Unable to find necessary graphical assets (copy from framework 'Resources' folder)");
-    
     layer = [[RMMarker alloc] initWithUIImage:[UIImage imageNamed:@"TrackingDot.png"]];
 
     layer.zPosition = -MAXFLOAT + 2;

@@ -24,3 +24,4 @@
 #define NS_BLOCK_ASSERTIONS 1
 #endif
 
+#define RMRequireAsset(asset) NSAssert([[NSBundle mainBundle] pathForResource:[asset stringByReplacingOccurrencesOfString:[@"." stringByAppendingString:[asset pathExtension]] withString:@""] ofType:[asset pathExtension]], @"Unable to find %@ (copy from framework 'Resources' folder)", asset);