UILabel *label = [[UILabel alloc] init];
    NSString *wordStr = @"i-Do-Not-Like-The-Word-I-Only-Like-You";
    label.text = wordStr;
    NSMutableAttributedString *attStr = [[NSMutableAttributedString alloc] initWithString:wordStr];
    NSRange range = [wordStr rangeOfString:@"I"];
    [attStr addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(range.location, wordStr.length - range.location)];
    label.attributedText = attStr;