gistfile1.m

- (void) getDataFromLocalJSON
{
    NSString *jsonPath = @"response.json";
    NSFileHandle *file;
    NSData *databuffer;
    file = [NSFileHandle fileHandleForReadingAtPath: jsonPath];
    if (file) {
        databuffer = [file readDataToEndOfFile];
        [file closeFile];
    }
    else {
        NSLog(@"Failed to open file");
    }
    
    NSError *error;
    NSDictionary *json = [NSJSONSerialization JSONObjectWithData:databuffer options:kNilOptions error:&error];
}