NSMutableAttributedString可变字符串使用

    //原始数据字符串
    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:30];
    [attrString addAttribute:NSFontAttributeName
                       value:smallFont
                       range:NSMakeRange(5, 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:@"是"]];
    
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(20, 44, 320, 200)];
    label.numberOfLines = 0;
    [self.view addSubview:label];
    label.attributedText = attrString;