swift - 在 TextView 中解析主题标签

Question

我在 TextView 上设置文本，然后调用 UITextView 扩展的这个方法，以便从主题标签和提及的单词中创建链接 (Swift 3)

extension UITextView {
    func resolveHashTags(font: UIFont =  UIFont.systemFont(ofSize: 17.0)){
        if let text = self.text {

            let words:[String] = text.components(separatedBy: " ")

            let attrs = [ NSFontAttributeName : font ]
            let attrString = NSMutableAttributedString(string: text, attributes:attrs)
            for word in words {
                if (word.characters.count > 1 && ((word.hasPrefix("#") && word[1] != "#") || (word.hasPrefix("@") && word[1] != "@"))) {

                    let matchRange = text.range(of: word)
                    let newWord = String(word.characters.dropFirst())

                    if let matchRange = matchRange {

                        attrString.addAttribute(NSLinkAttributeName, value: "\(word.hasPrefix("#") ? "hashtag:" : "mention:")\(newWord)", range: text.NSRangeFromRange(range: matchRange))
                    }
                }
            }

            self.attributedText = attrString
        }
    }
}

我的问题很简单。我无法为类似 "helloworld#hello" 的内容创建链接，因为我的单词没有前缀 "#"

我无法弄清楚的另一种情况是，当用户将多个主题标签放在一起时，例如 “hello world，你好吗？#success#moments#connect”，因为这都将被视为 1当它应该是 3 个不同的链接时，带有当前逻辑的标签。

我该如何纠正？谢谢

Answer 1

func resolveHashTags(text : String) -> NSAttributedString{
    var length : Int = 0
    let text:String = text
    let words:[String] = text.separate(withChar: " ")
    let hashtagWords = words.flatMap({$0.separate(withChar: "#")})
    let attrs = [NSFontAttributeName : UIFont.systemFont(ofSize: 17.0)]
    let attrString = NSMutableAttributedString(string: text, attributes:attrs)
    for word in hashtagWords {
        if word.hasPrefix("#") {
                let matchRange:NSRange = NSMakeRange(length, word.characters.count)
                let stringifiedWord:String = word

                attrString.addAttribute(NSLinkAttributeName, value: "hash:\(stringifiedWord)", range: matchRange)
        }
        length += word.characters.count
    }
    return attrString
}

为了分隔单词，我使用了字符串扩展

extension String {
    public func separate(withChar char : String) -> [String]{
    var word : String = ""
    var words : [String] = [String]()
    for chararacter in self.characters {
        if String(chararacter) == char && word != "" {
            words.append(word)
            word = char
        }else {
            word += String(chararacter)
        }
    }
    words.append(word)
    return words
}

}

   func textViewDidChange(_ textView: UITextView) {
        textView.attributedText = resolveHashTags(text: textView.text)
        textView.linkTextAttributes = [NSForegroundColorAttributeName : UIColor.red]
    }

希望这就是您要找的。告诉我它是否适合您。