Question

我的第一个问题是如何在textView中更改单词示例“test”的字体，并且@bkrl和@Torongo正确回答了它。

func changeAllOccurence(of string: String, font: UIFont) -> NSAttributedString {
    let attributedString = NSMutableAttributedString(string: self)
    var range = NSMakeRange(0, attributedString.mutableString.length)

    while(range.location != NSNotFound)
    {
        range = attributedString.mutableString.range(of: string, options: .caseInsensitive, range: range)
        if(range.location != NSNotFound)
        {
            attributedString.addAttribute(NSFontAttributeName,
                                          value: font,
                                          range: range)
            range = NSMakeRange(range.location + range.length, self.characters.count - (range.location + range.length));
        }
    }

    return attributedString
}

由于我还不熟悉上面的代码，我尝试添加几行以便对代码进行概括，以便它可以用于字符串数组而不仅仅是一个字符串。但是肯定它没有用，因为它改变了最后一个单词的字体，这是合理的，因为最后的改变将是最后一个单词，即“用法”：

        let words = ["example", "usage"]
        for word in words {
        let attributedText = text.changeAllOccurence(of: word, font: UIFont.boldSystemFont(ofSize: 17))
        textview.attributedText = attributedText
    }

有人可以建议如何改进@Toromgo提供的代码，以便处理任何字符串数组而不仅仅是一个字符串吗？

Answer 1

您可以创建扩展程序，如：

extension String {

    func change(font: UIFont, of string: String) -> NSAttributedString {
        let attributedString = NSMutableAttributedString(string: self)
        let subStringRange = attributedString.mutableString.range(of: string,
                                                                  options: .caseInsensitive)
        if subStringRange.location != NSNotFound {
            attributedString.addAttribute(NSFontAttributeName,
                                          value: font,
                                          range: subStringRange)
        }
        return attributedString
    }

}

用法：

let text = "This is example of usage extension"
let attributedText = text.change(font: UIFont.boldSystemFont(ofSize: 17), of: "example")
textView.attributedText = attributedText

希望有所帮助！

Answer 2

由于您已更改了问题，我已相应更新了我的答案。请试试这个：

extension String {

    func changeAllOccurence(of strings: [String], font: UIFont) -> NSAttributedString {
        let attributedString = NSMutableAttributedString(string: self)
        for eachString in strings {
            var range = NSMakeRange(0, attributedString.mutableString.length)

            while(range.location != NSNotFound)
            {
                range = attributedString.mutableString.range(of: eachString, options: .caseInsensitive, range: range)
                if(range.location != NSNotFound)
                {
                    attributedString.addAttribute(NSFontAttributeName,
                                                  value: font,
                                                  range: range)
                    range = NSMakeRange(range.location + range.length, self.characters.count - (range.location + range.length));
                }
            }
        }
        return attributedString
    }

}

我已经运行了代码并且它正在运行。

在TextView - swift - EDIT中更改String数组的样式

2 个答案: