iOS ~ 文本 行间距，字间距，行与字间距

• iOS UILabel设置行间距和字间距

设置文本的：行间距，字间距，行与字间距

Objective-C代码：NSParagraphStyleAttributeName

    CGFloat signUpKnowWidth = 0;
    CGFloat signUpKnowHeight = 0;
    if (noticeContentL.text.length > 0) {
        // 单行文本（宽度）
//        CGSize size = [knowString sizeWithAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:[UIScreen mainScreen].bounds.size.width/375*13 weight:UIFontWeightMedium]}];
        
        // 多行文本（高度）
        NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc] init];
        [style setLineBreakMode:NSLineBreakByCharWrapping];
        style.lineSpacing = 5;
        CGSize size = [noticeContentL.text boundingRectWithSize:CGSizeMake([UIScreen mainScreen].bounds.size.width/375*310, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:[UIScreen mainScreen].bounds.size.width/375*13 weight:UIFontWeightMedium], NSParagraphStyleAttributeName:style} context:nil].size;
        
        signUpKnowWidth = ceil(size.width); // ceil 如果参数是小数，则求最小的整数但不小于本身
        signUpKnowHeight = ceil(size.height);
        
        // 设置行间距：
        NSMutableAttributedString *attriString = [[NSMutableAttributedString alloc] initWithString:noticeContentL.text];
        [attriString addAttribute:NSParagraphStyleAttributeName value:style range:NSMakeRange(0, [noticeContentL.text length])];
        noticeContentL.attributedText = attriString;
    }

swift代码：

        let lblTitle = UILabel(frame: CGRect(x: 10, y: 150, width: KScreenWidth-20, height: 100))
        lblTitle.textColor = UIColor.white
        lblTitle.backgroundColor = UIColor.darkGray
        lblTitle.textAlignment = .center
        lblTitle.numberOfLines = 0
        lblTitle.font = UIFont.systemFont(ofSize: 12)
        lblTitle.text = "SDCycleScrollView之前一直在OC中使用觉得很简单又熟悉了所以这次写的Demo依旧搬了过来.SDCycleScrollView之前一直在OC中使用觉得很简单又熟悉了所以这次写的Demo依旧搬了过来."
        self.view.addSubview(lblTitle)

        let attrStr = NSMutableAttributedString(string: lblTitle.text!)
        //设置行间距
        let style:NSMutableParagraphStyle  = NSMutableParagraphStyle()
        style.lineSpacing = 10              //行间距（垂直上的间距）
        style.lineBreakMode = .byCharWrapping       //英文字符拆开显示，byWordWrapping表示不拆开显示
        style.alignment = .center           //居中显示（如果要设置alignment，这个必须设置，因为label的textAlignment会无效）
        style.firstLineHeadIndent = 25.0    //设置首行字符缩进距离
        style.headIndent = 5                //每行的左右间距（字间距）
        attrStr.addAttribute(NSParagraphStyleAttributeName, value: style, range: NSRange(location: 0, length: (lblTitle.text?.characters.count)!))
        //设置字间距
        attrStr.addAttribute(NSKernAttributeName, value: 1.5, range: NSRange(location: 0, length: (lblTitle.text?.characters.count)!))
        lblTitle.attributedText = attrStr