更改UILabel中某个单词的颜色

Question

我只想更改Label的字符串中某些单词的颜色。

我想做的是：

我是怎么做的：

但它不起作用，它说：＆＃39; NSMutableRLEArray replaceObjectsInRange：withObject：length :: out of bounds＆＃39;

所以我需要一个建议来做这个简单的事情，我需要一个技巧来做到这一点。你们可以发送你的方式。

Answer 1

试试这个，当你尝试获取字符串的范围时，你的属性字符串没有值。在此之前，您必须为属性字符串赋予字符串值。你

  let descriptionLabel: UILabel = {

      let label = UILabel()

      // String variable containing the text.
      let fullString = "mehmet alper tabak"

      // Choose wwhat you want to be colored.
      let coloredString = "alper"

      // Get the range of the colored string.
      let rangeOfColoredString = (fullString as NSString).range(of: coloredString)

      // Create the attributedString.
      let attributedString = NSMutableAttributedString(string:fullString)
      attributedString.setAttributes([NSForegroundColorAttributeName: UIColor.red],
                              range: rangeOfColoredString)
      label.attributedText = attributedString
     return label
   }()

   descriptionLabel.frame = CGRect(x: 50, y: 50, width: 140, height: 100)
   self.view.addSubview(descriptionLabel)

或者你可以扩展UILabel。

  extension UILabel {

      func colorString(text: String?, coloredText: String?, color: UIColor? = .red) {

      let attributedString = NSMutableAttributedString(string: text!)
      let range = (text! as NSString).range(of: coloredText!)
      attributedString.setAttributes([NSForegroundColorAttributeName: color!],
                               range: range)
      self.attributedText = attributedString
  }

使用它。

      self.testLabel.colorString(text: "mehmet alper tabak",
                           coloredText: "alper")

Answer 2

它超出范围，因为在您尝试设置属性时myMutableString为空。请尝试改为：

let myMutableString = NSMutableAttributedString.init(string: label.text)

Answer 3

使用第一种颜色

创建attributedString1

let attributedString1 = NSAttributedString(string: "robert plant ", attributes: [NSForegroundColorAttributeName: color1])

使用第二种颜色创建attributedString2

let attributedString1 = NSAttributedString(string: "with queen", attributes: [NSForegroundColorAttributeName: color2])

将它们添加到myMutableString

myMutableString.append(attributedString1)
myMutableString.append(attributedString1)