NSMutableAttributedString 文本顏色無法正常工作

Question

我有以下 swift 4.1 代碼：

    let timeduration = NSMutableAttributedString.init(string: "a dynamic string of time");

    timeduration.addAttribute(kCTFontAttributeName as NSAttributedStringKey, value: UIFont.systemFont(ofSize: 16), range: NSRange(location: 0, length: timeduration.length));
    timeduration.addAttribute(kCTForegroundColorAttributeName as NSAttributedStringKey, value: UIColor(red: 200/255, green: 200/255, blue: 200/255, alpha: 1.0), range: NSRange(location: 0, length: timeduration.length));
    timeduration.addAttribute(kCTFontAttributeName as NSAttributedStringKey, value: UIFont.systemFont(ofSize: 50), range: NSRange(location: 0, length: timecount));
    timeduration.addAttribute(kCTFontAttributeName as NSAttributedStringKey, value: UIFont.systemFont(ofSize: 25), range: NSRange(location: timecount, length: 2));

我使用的是 Swift 3 並使用 Xcode 的工具遷移到 swift 4.1，但前景色似乎不起作用。 XCode 工具“修復”添加了 kCT 代碼。 字體名稱和大小似乎可以正常工作。

Answer 1

這是您的問題的解決方案。 在 Swift 4.0 及更高版本中，有一個名為 NSAttributedStringKey 的結構，它定義了字符串屬性的鍵。

let timeduration = NSMutableAttributedString.init(string: "a dynamic string of time")

timeduration.addAttribute(NSAttributedStringKey.font, value: UIFont.systemFont(ofSize: 16), range: NSRange(location: 0, length: timeduration.length))

timeduration.addAttribute(NSAttributedStringKey.foregroundColor, value: 

UIColor(red: 200/255, green: 200/255, blue: 200/255, alpha: 1.0), range: 
NSRange(location: 0, length: timeduration.length))

timeduration.addAttribute(NSAttributedStringKey.font, value: UIFont.systemFont(ofSize: 50), range: NSRange(location: 0, length: timecount))

timeduration.addAttribute(NSAttributedStringKey.font, value: UIFont.systemFont(ofSize: 25), range: NSRange(location: timecount, length: 2))

Answer 2

fixit 給了你錯誤的鍵。 你想改用這樣的東西：

timeduration.addAttribute(NSAttributedString.Key.foregroundColor, value: UIColor.red, range: NSRange(location: 0, length: timeduration.length))

所有其他人也是如此。

您使用的鍵用於較低級別的核心文本內容。

Answer 3

你可以這樣做，我希望問題能得到解決：-

let label = UILabel()
let labelText = "String Text"

let strokeTextAttributes = [
     NSAttributedStringKey.strokeColor : UIColor.black,
     NSAttributedStringKey.foregroundColor : UIColor.white,
     NSAttributedStringKey.strokeWidth : -2.0,
     NSAttributedStringKey.font : UIFont.boldSystemFont(ofSize: 18)
   ] as [NSAttributedStringKey : Any]

label.attributedText = NSAttributedString(string: labelText, attributes: strokeTextAttributes)