Swift UILabel, letter animation

Here is a  code snippet to animate a UILabel display as if you were typing text on the keyboard, letter by letter. It is a swift extension to be used by simply call as a function.

I also advise you for this kind of thing to create a file by extension, UILabel.swift, UIImage.swift .... as we started to do in the swift stack.

extension UILabel {
    /**
    * @desc anime text like if someone write it
    * @param {String} text,
    * @param {TimeInterval} characterDelay,
    */
    func animate(newText: String, interval: TimeInterval = 0.07, lineSpacing: CGFloat = 1.2, letterSpacing: CGFloat = 1.1) {
        let paragraphStyle = NSMutableParagraphStyle()
        paragraphStyle.lineSpacing = 1.2
        paragraphStyle.lineHeightMultiple = 1.2
        paragraphStyle.alignment = .center
        var pause: TimeInterval = 0
        self.text = ""
        var charIndex = 0.0
        for letter in newText {
            Timer.scheduledTimer(withTimeInterval: interval * charIndex + pause, repeats: false) { (_) in
                self.text?.append(letter)
                let attributedString = NSMutableAttributedString(string: self.text ?? "")
                attributedString.addAttribute(NSAttributedString.Key.paragraphStyle, value: paragraphStyle, range: NSRange(location: 0, length: attributedString.length))
                attributedString.addAttribute(NSAttributedString.Key.kern, value: letterSpacing, range: NSRange(location: 0, length: attributedString.length - 1))
                self.attributedText = attributedString
            }
            charIndex += 1
            if(letter == "," || letter == ".") {
                pause += 0.5
            }
        }    }
}

After a rush of code lately, I will be able to resume writing more regularly on the blog. I will try to share a lot of Snippets of this style, always useful to give a little more life to a project, but also compatible with our stacks.