ios – 使字符串的一部分与搜索字符串匹配

我有一个项目表,每个项目都有一个标签.我还有一个搜索栏,用于根据mySearchBar.text是myLabel.text的子字符串来过滤表中的项目.

这一切都运行正常,但我想加粗与搜索字符串匹配的标签文本部分.

最终产品类似于谷歌地图搜索.

Swift 4：XCode 9.x

private func filterAndModifyTextAttributes(searchStringCharacters: String, completeStringWithAttributedText: String) -> NSMutableAttributedString {

    let attributedString: NSMutableAttributedString = NSMutableAttributedString(string: completeStringWithAttributedText)
    let pattern = searchStringCharacters.lowercased()
    let range: NSRange = NSMakeRange(0, completeStringWithAttributedText.characters.count)
    var regex = NSRegularExpression()
    do {
        regex = try NSRegularExpression(pattern: pattern, options: NSRegularExpression.Options())
        regex.enumerateMatches(in: completeStringWithAttributedText.lowercased(), options: NSRegularExpression.MatchingOptions(), range: range) {
            (textCheckingResult, matchingFlags, stop) in
            let subRange = textCheckingResult?.range
            let attributes : [NSAttributedStringKey : Any] = [.font : UIFont.boldSystemFont(ofSize: 17),.foregroundColor: UIColor.red ]
            attributedString.addAttributes(attributes, range: subRange!)
        }
    }catch{
        print(error.localizedDescription)
    }
    return attributedString
}

How to use :

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
     let cell = UITableViewCell(style: .subtitle , reuseIdentifier: "Cell")
     cell.textLabel?.attributedText = self.filterAndModifyTextAttributes(searchStringCharacters: self.textFromSearchBar, completeStringWithAttributedText: searchResultString)
     return cell

}