Read JSON resource into an NSDictionary

readJSONResourceNamed.m

- (NSDictionary *)readJSONResourceNamed:(NSString *)resourceName {

    NSString *filePath = [[NSBundle mainBundle] pathForResource:resourceName
                                                         ofType:@"json"];
    
    NSData *fileData = [NSData dataWithContentsOfFile:filePath];
    if (!fileData)
        return nil;

    NSError *error = nil;
    id jsonObject = [NSJSONSerialization JSONObjectWithData:fileData options:0 error:&error];
    if (!jsonObject || error)
        return nil;
    
    if ([jsonObject isKindOfClass:[NSDictionary class]])
        return (NSDictionary *)jsonObject;
    else
        return nil;
}