Changed isNumeric check

Author: Hirbod

src/ios/GoogleMaps/GoogleMapsViewController.m

@@ -377,12 +377,16 @@ -(UIView *)mapView:(GMSMapView *)mapView markerInfoWindow:(GMSMarker*)marker
 
 	if (styles && [styles objectForKey:@"width"]) {
 		NSString *widthString = [styles valueForKey:@"width"];
+        
+        // check if string is numeric
+        NSNumberFormatter *nf = [[NSNumberFormatter alloc] init];
+        BOOL isNumeric = [nf numberFromString:widthString] != nil;
 
 		if ([widthString hasSuffix:@"%"]) {
 			double widthDouble = [[widthString stringByReplacingOccurrencesOfString:@"%" withString:@""] doubleValue];
 
 			width = (int)((double)mapView.frame.size.width * (widthDouble / 100));
-		} else if ([widthString isNumeric:widthString]) {
+		} else if (isNumeric) {
 			double widthDouble = [widthString doubleValue];
 
 			if (widthDouble <= 1.0) {
@@ -398,14 +402,17 @@ -(UIView *)mapView:(GMSMapView *)mapView markerInfoWindow:(GMSMarker*)marker
 	if (styles && [styles objectForKey:@"maxWidth"]) {
 		NSString *widthString = [styles valueForKey:@"maxWidth"];
 
+        NSNumberFormatter *nf = [[NSNumberFormatter alloc] init];
+        BOOL isNumeric = [nf numberFromString:widthString] != nil;
+        
 		if ([widthString hasSuffix:@"%"]) {
 			double widthDouble = [[widthString stringByReplacingOccurrencesOfString:@"%" withString:@""] doubleValue];
 
 			maxWidth = (int)((double)mapView.frame.size.width * (widthDouble / 100));
 
 			// make sure to take padding into account.
 			maxWidth -= sizeEdgeWidth;
-		} else if ([widthString isNumeric:widthString]) {
+		} else if (isNumeric) {
 			double widthDouble = [widthString doubleValue];
 
 			if (widthDouble <= 1.0) {