fetch local json file and parse it to a dictionary

fetchLocalJSON.m

- (NSDictionary *)fetchLocalJSON:(NSString *) pathForResource {
    NSDictionary *dictionary;
    // read JSON file
    NSString *fileName = [[NSBundle mainBundle] pathForResource:pathForResource ofType:@"json"];
    if (fileName) {
        NSLog(@"file exist: %@", fileName);
        
        // get file data
        NSData *fileData = [[NSData alloc] initWithContentsOfFile:fileName];
        
        // catch error
        NSError *error;
        
        // parse to dictionary
        dictionary = [NSJSONSerialization JSONObjectWithData:fileData options:0 error:&error];
        
        // error
        if (error) {
            NSLog(@"JSON parse error：%@", error.localizedDescription);
        }
    } else {
        NSLog(@"file not exist！%@", fileName);
    }
    
    return dictionary;
}