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I have an UITextField with long text inside, I need to find all the occurrences of a string inside the text and make them bold. I know I should use NSMutableAttributedString for making the text bold, but how can I search specific substring inside the text?

Szanownego
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  • This question may help: [Find all locations of substring in NSString (not just first)](https://stackoverflow.com/questions/7033574/find-all-locations-of-substring-in-nsstring-not-just-first) – 93xrli Jan 04 '20 at 10:32

1 Answers1

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You can create a textView extension that can be called on your textView outlet:

extension UITextView {    
    func makeBold(originalText: String, boldText: String) {

        let attributedOriginalText = NSMutableAttributedString(string: originalText)
        let boldRange = attributedOriginalText.mutableString.range(of: boldText)

        attributedOriginalText.addAttribute(NSAttributedString.Key.font, value: UIFont.boldSystemFont(ofSize: 13), range: boldRange)
        self.attributedText = attributedOriginalText
    }
}

How to use: 

@IBOutlet weak var textView: UITextView!

textView.makeBold(originalText: "Make bold", boldText: "bold")
elarcoiris
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  • That works great, thanks a lot Is there a way to take only full word occurrence? With this solution if I search "me" It gets bold also the value inside a work (e.g. mercy "me" gets bold but in this case should be avoided) – Szanownego Jan 04 '20 at 12:55
  • Check out the example in this answer for that and take note of the comments for your application https://stackoverflow.com/a/7033787/4844273 – elarcoiris Jan 06 '20 at 05:45