ios - 在UILabel IOS的​​特定部分添加文本 "...Read more"

Question

当我的标签文本超过 3 行时，我想将此文本“...阅读更多”，我想防止我的文本不会被截断。

我尝试了一些代码，但在使用不同的 iPhone 宽度时遇到了问题，我的代码适用于 iPhone 6s，但不适用于 iPhone 4s 和 iPhone 5s。

这是我的代码:

let originalText = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec tristique ipsum non pretium mollis. Curabitur tristique asfhaksjf sfjhksafhdaf ahsdifhsadfh asdfhsahfoas sdofhasdhfasdf"

        label.text = originalText
        let labelWidth = label.frame.size.width * CGFloat(label.numberOfLines)

        let str = label.text! as NSString

        let words = str.componentsSeparatedByString(" ")
        var newStr = "" as NSString

        for word in words {
            let statement = "\(newStr) \(word) ... Read more" as NSString
            let size = statement.sizeWithAttributes([NSFontAttributeName: label.font])
            let readMoreStatement = " ... Read more" as NSString
            let sizeReadMore = readMoreStatement.sizeWithAttributes([NSFontAttributeName : label.font])

            if size.width < labelWidth {

                newStr = "\(newStr) \(word)"
                label.text = newStr as String
            } else {
                newStr = newStr.stringByAppendingString("... Read More")
                label.text = newStr as String
                break
            }
        }

这是 4s 上的结果:

这是 6s 的结果:

有什么建议我可以如何解决这个问题吗？

Answer 1

您需要首先自动约束您的标签并使用以下代码

  let originalText = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec tristique ipsum non pretium mollis. Curabitur tristique asfhaksjf sfjhksafhdaf ahsdifhsadfh asdfhsahfoas sdofhasdhfasdf"

    label.text = originalText
    print((label.text?.characters.count)!) 

    if (label.text?.characters.count)! < 100 { 

           label.text = originalText
           label.center  = view.center
           label.textAlignment = .justified 
           label.adjustsFontSizeToFitWidth = true // If you want a dynamic font size
           label.sizeToFit()
           print(label.text!) // If character count less then 100 approximately 3 lines
        } else {

            label.text = "...Read more"
            label.textAlignment = .center 
            print(label.text!) //If character count more then 100 exceeds 3 lines         

     // You can setup a UIButton here for your "...Read more" action

    }

希望这对您有帮助......