iOS label设置不同的字体 颜色

 UILabel * lable = [[UILabel alloc] initWithFrame:CGRectMake(0, 70, 320, 40)];    lable.numberOfLines = 0;//    lable.backgroundColor = [UIColor greenColor];    [self.view addSubview:lable];        NSString *string =    @"我是好人"@"我是好人"@"我是个好人"@"额鹅鹅鹅鹅鹅鹅饿"@"哇哇哇哇哇哇哇";    // 创建可变属性化字符串    NSMutableAttributedString *attrString =    [[NSMutableAttributedString alloc] initWithString:string];    //改变字符串当中从第18位置向后的10位数的字体    UIFont *smallFont = [UIFont systemFontOfSize:12];    [attrString addAttribute:NSFontAttributeName value:smallFont range:NSMakeRange(18, 10)];    //改变字符串当中第一个“1”的颜色    UIColor *rcolor = [UIColor redColor];        [attrString addAttribute:NSForegroundColorAttributeName value:rcolor range:[string rangeOfString:@"鹅"]];    lable.attributedText = attrString;