Question

我的UITextView中有一个大文本，我想将文本的50％设置为红色，将其他50％设置为绿色。我在TextView中添加了NSMutableAttributedString，但是它适用于整个文本范围。如何将textView的文本分为两部分，并用红色和绿色上色？

import moment from "moment";

const validateDate = ({ date }) => {
  return moment(date, "DD-MM-YYYY").isSameOrAfter(
    moment(new Date(), "DD-MM-YYYY", "days")
  );
};

export default validateDate;

Answer 1

似乎您已经扩展了UITextView。以下扩展功能将使文本视图的现有属性文本为半红色和半绿色。所有其他现有属性（如果有）将保留。

extension UITextView {
    func makeHalfRedGreen() {
        if let text = self.text {
            let half = text.count / 2
            let halfIndex = text.index(text.startIndex, offsetBy: half)
            let firstRange = NSRange(..<halfIndex, in: text)
            let secondRange = NSRange(halfIndex..., in: text)
            let attrTxt = NSMutableAttributedString(attributedString: attributedText)
            attrTxt.addAttribute(.foregroundColor, value: UIColor.red, range: firstRange)
            attrTxt.addAttribute(.foregroundColor, value: UIColor.green, range: secondRange)
            attributedText = attrTxt
        }
    }
}

Answer 2

尝试使用如下功能

text_lbl.attributedText = self.decorateText(txt1: "Red Color", txt2: “Blue Color”)


func decorateText(txt1:String, txt2:String)->NSAttributedString{
    let textAttributesOne = [NSAttributedStringKey.foregroundColor: UIColor.red, NSAttributedStringKey.font: UIFont(name: "Poppins-Regular", size: 12.0)!] as [NSAttributedStringKey : Any]
    let textAttributesTwo = [NSAttributedStringKey.foregroundColor: UIColor.blue, NSAttributedStringKey.font: UIFont(name: "Poppins-SemiBold", size: 14.0)!] as [NSAttributedStringKey : Any]

    let textPartOne = NSMutableAttributedString(string: txt1, attributes: textAttributesOne)
    let textPartTwo = NSMutableAttributedString(string: txt2, attributes: textAttributesTwo)

    let textCombination = NSMutableAttributedString()
    textCombination.append(textPartOne)
    textCombination.append(textPartTwo)
    return textCombination
}

Answer 3

尝试使用textView委托的textView：shouldChangeTextInRange：replacementText协议

使一半的TextView文本颜色不同于其他50％的文本SWIFT

3 个答案: