字符串某个字符修改颜色、给字符串添加

字符串某个字符修改颜色:

UILabel *titleLabel = [[UILabel alloc]init];
titleLabel.font = smallFont;
titleLabel.text = @"*新密码";
titleLabel.textAlignment = NSTextAlignmentRight;
titleLabel.frame = lxy(5, 20+50, labelSize.width, 20);
NSMutableAttributedString *hintString=[[NSMutableAttributedString alloc]initWithString:titleLabel.text];
            //获取要调整颜色的文字位置,调整颜色
NSRange range=[[hintString string]rangeOfString:@"*"];
[hintString addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:range];
titleLabel.attributedText = hintString;

效果如图:

给字符串添加下划线:

    UILabel *registLabel = [[UILabel alloc]init];
    registLabel.text = @"新用户注册";
    registLabel.userInteractionEnabled = YES;
    CGSize size = [registLabel.text boundingRectWithSize:CGSizeMake(250, 2000) options:NSStringDrawingUsesLineFragmentOrigin attributes:[NSDictionary dictionaryWithObject:registLabel.font forKey:NSFontAttributeName] context:nil].size;
    registLabel.frame = lxy((SCREEN_WIDTH-size.width)/2, SCREEN_HEIGHT-20-30, size.width, size.height);
    [self.view addSubview:registLabel];

    NSDictionary *attribtDic = @{NSUnderlineStyleAttributeName: [NSNumber numberWithInteger:NSUnderlineStyleSingle]};
    NSMutableAttributedString *attribtStr = [[NSMutableAttributedString alloc]initWithString:registLabel.text attributes:attribtDic];
    registLabel.attributedText = attribtStr;

效果图如下: