Swift String extension method to provide you with a truncated version of itself, with optional trailing text

String+Extensions.swift

extension String {
    
    // Modified from original: https://techvangelist.net/truncate-a-string-in-swift-2-0/
    // We respect max character length requested, even if we allow ellipsis.
    func truncated(toMaxLength length: Int, trailing: String? = "...") -> String {
        if self.characters.count > length {
            let trailingText = trailing ?? ""
            let uptoIndex = length - 1 - trailingText.characters.count
            return self.substringToIndex(self.startIndex.advancedBy(uptoIndex)) + trailingText
        } else {
            return self
        }
    }
    
}