无法在 Swift 中使 UILabel 的某些部分成为下划线？

Question

我有一个 UILabel 我想将它的某些部分作为下划线。我正在使用下面的代码。但它强调整个标签而不是标签的某些部分。请告诉我如何使标签的某些部分成为下划线。

let attributedString = NSMutableAttributedString(string: "UserAgreement".localized)
attributedString.addAttribute(NSUnderlineStyleAttributeName, value: NSUnderlineStyle.styleSingle.rawValue, range: NSRange(location: 0, length: 10))

labelTc.attributedText = attributedString

我不想处理故事板

Answer 1

尝试这个

雨燕4

    let wholeStr = "Don't have an account? Register"
    //let rangeToUnderLine = (wholeStr as NSString).range(of: "Register")
    let rangeToUnderLine = NSRange(location: 0, length: 10))
    let underLineTxt = NSMutableAttributedString(string: wholeStr, attributes: [NSAttributedStringKey.font:UIFont.systemFont(ofSize: 20),NSAttributedStringKey.foregroundColor: UIColor.white.withAlphaComponent(0.8)])
    underLineTxt.addAttribute(NSAttributedStringKey.underlineStyle, value: NSUnderlineStyle.styleSingle.rawValue, range: rangeToUnderLine)
    labelTc.attributedText = underLineTxt

斯威夫特 3.2

    let wholeStr = "Don't have an account? Register"
    //let rangeToUnderLine = (wholeStr as NSString).range(of: "Register")
    let rangeToUnderLine = NSRange(location: 0, length: 10))
    let underLineTxt = NSMutableAttributedString(string: wholeStr, attributes: [NSFontAttributeName:UIFont.systemFont(ofSize: 20),NSForegroundColorAttributeName: UIColor.white])
    underLineTxt.addAttribute(NSUnderlineStyleAttributeName, value: NSUnderlineStyle.styleSingle.rawValue, range: rangeToUnderLine)
    labelTc.attributedText = underLineTxt