ios - 用2行截断UILabel的头

我有一个UIlabel的numberOfLines为2
和lineBreakMode =截头

但是当我运行它
而不是像第一行那样截断头

    ...1st Line Content
    2nd Line Content

截断像

    1st Line Content
    ...2nd Line Content

如何在第一行本身中截断标签的开头？

最佳答案

试试这个在Swift 3中测试过的代码

   let text = "Hello World! Hello World! Hello World! Hello World! "
    let attString = NSMutableAttributedString(string: text)
    let paragraphStyle = NSMutableParagraphStyle()
    paragraphStyle.alignment = .left
    paragraphStyle.firstLineHeadIndent = 0
    paragraphStyle.headIndent = 40 // set any vallue
    paragraphStyle.lineBreakMode = .byTruncatingHead
    attString.addAttribute(NSParagraphStyleAttributeName, value:paragraphStyle, range:NSMakeRange(0, attString.length))
    attString.addAttribute(NSFontAttributeName, value: UIFont(name: "Arial", size: 25)!, range: NSMakeRange(0, attString.length))
    label.attributedText = attString // label is your UILabel
    label.numberOfLines = 2

输出1:

    paragraphStyle.firstLineHeadIndent = 40 // set any vallue
    paragraphStyle.headIndent = 0

输出2:



更新:可以通过组合两个属性字符串来实现

    let dotAttributes = [NSForegroundColorAttributeName: UIColor.red, NSFontAttributeName: UIFont(name: "Arial", size: 25)]
    let textAttributes = [NSForegroundColorAttributeName: UIColor.red, NSFontAttributeName: UIFont(name: "Arial", size: 25)]

    let dotString = NSMutableAttributedString(string: ". . . ", attributes: dotAttributes)
    let textString = NSMutableAttributedString(string: "Hello World! Hello World! Hello World! Hello World!", attributes: textAttributes)

    let totalString = NSMutableAttributedString()
    totalString.append(dotString)
    totalString.append(textString)

    label.numberOfLines = 2
    label.attributedText = totalString

注意:可以使用paragraphStyle(headIndent)创建左边距。

    let paragraphStyle = NSMutableParagraphStyle()
    paragraphStyle.alignment = .left
    paragraphStyle.firstLineHeadIndent = 5
    paragraphStyle.headIndent = 5 // set any vallue
    paragraphStyle.lineBreakMode = .byTruncatingHead
    totalString.addAttribute(NSParagraphStyleAttributeName, value:paragraphStyle, range:NSMakeRange(0, totalString.length))

输出:

关于ios - 用2行截断UILabel的头，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/40716727/