Make part of a UILabel bold in Swift

Question

I have a UILabel I\'ve made programmatically as:

var label = UILabel()

I\'ve then declared some styling for the label, includi

Answer 1

Swift 4.0 solution

let font = UIFont.systemFont(ofSize: 14)

func boldSearchResult(searchString: String, resultString: String) -> NSMutableAttributedString {
    let attributedString: NSMutableAttributedString = NSMutableAttributedString(string: resultString)

    guard let regex  = try? NSRegularExpression(pattern: searchString.lowercased(), options: []) else {
        return attributedString
    }

    let range: NSRange = NSMakeRange(0, resultString.count)

    regex.enumerateMatches(in: resultString.lowercased(), options: [], range: range) { (textCheckingResult, matchingFlags, stop) in
        guard let subRange = textCheckingResult?.range else {
            return
        }

        attributedString.addAttributes([NSAttributedString.Key.font : font], range: subRange)
    }

    return attributedString
}