ios - 用 2 行截断 UILabel 的头部

Question

我有一个 UIlabel，其 numberOfLines 为 2和 lineBreakMode = 截断头部

但是当我运行它时而不是像

这样在第一行截断头部

    ...1st Line Content
    2nd Line Content

它像这样截断

    1st Line Content 
    ...2nd Line Content

我如何在第一行中截断标签的头部？

Answer 1

试试这段在 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:您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:您可以使用 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: