ios - 在 Swift 3 中加粗字符串的单个部分

Question

我一直在为这个问题苦苦挣扎。但是我正在处理远程通知，老实说，我似乎无法找到一种方法来将通知的第一行加粗。这是我的代码

  let boldUser = backendless!.userService.currentUser.name!

    let string: NSString = "\(boldUser) \nMessage: \(message)" as NSString

    let attributedString = NSMutableAttributedString(string: string as String, attributes: [NSFontAttributeName:UIFont.systemFont(ofSize: 15.0)])

    let boldFontAttribute = [NSFontAttributeName: UIFont.boldSystemFont(ofSize: 15.0)]

    // Part of string to be bold
    attributedString.addAttributes(boldFontAttribute, range: string.range(of: "\(boldUser)" as String))

    publishOptions.assignHeaders(["ios-alert" : "\(string)", "ios-badge" : "\(counter)", "ios-sound" : "message_tone_3.mp3"])

我不明白为什么这不起作用。据我所知，我做的一切都是正确的，但是当我测试时，没有一个通知是粗体的。我正在尝试将第一行加粗。

Answer 1

像这样使用 NSRange:

let string: NSString = "\(boldUser) \nMessage: \(message)" as NSString

    let attributedString = NSMutableAttributedString(string: string as String, attributes: [NSFontAttributeName:UIFont.systemFont(ofSize: 15.0)])

    let boldFontAttribute = [NSFontAttributeName: UIFont.boldSystemFont(ofSize: 15.0)]

    // Part of string to be bold
   // attributedString.addAttributes(boldFontAttribute, range: NSRange(location:0, length:StringArray[0].characters.count))


    // Part of string to be bold
    attributedString.addAttributes(boldFontAttribute, range: NSRange(location:0, length:StringArray[0].characters.count))