UITextView highlight all matches using swift

Question

I want to highlight all matches word with searching. I wrote code but I couldn\'t use a loop. When i search a word, my app find words and highlight only first word. here is

Answer 1

you can use the following function passing the search input and the current content. that will return a NSAttributedString? that you can set in your TextView

Swift 3

func generateAttributedString(with searchTerm: String, targetString: String) -> NSAttributedString? {
    let attributedString = NSMutableAttributedString(string: targetString)
    do {
        let regex = try NSRegularExpression(pattern: searchTerm, options: .caseInsensitive)
        let range = NSRange(location: 0, length: targetString.utf16.count)
        for match in regex.matches(in: targetString, options: .withTransparentBounds, range: range) {
            attributedString.addAttribute(NSFontAttributeName, value: UIFont.systemFont(ofSize: 16, weight: UIFontWeightBold), range: match.range)
        }
        return attributedString
    } catch _ {
        NSLog("Error creating regular expresion")
        return nil
    }
}

Edit:

highlight with diacritic insensitive option:

func generateAttributedString(with searchTerm: String, targetString: String) -> NSAttributedString? {

    let attributedString = NSMutableAttributedString(string: targetString)
    do {
        let regex = try NSRegularExpression(pattern: searchTerm.trimmingCharacters(in: .whitespacesAndNewlines).folding(options: .diacriticInsensitive, locale: .current), options: .caseInsensitive)
        let range = NSRange(location: 0, length: targetString.utf16.count)
        for match in regex.matches(in: targetString.folding(options: .diacriticInsensitive, locale: .current), options: .withTransparentBounds, range: range) {
            attributedString.addAttribute(NSFontAttributeName, value: UIFont.systemFont(ofSize: 16, weight: UIFontWeightBold), range: match.range)
        }
        return attributedString
    } catch {
        NSLog("Error creating regular expresion: \(error)")
        return nil
    }
}