Setting an ellipsis changing from 1 to 3 dots

Loading elipsis animation.swift

//Set a NSTimer to update call this function every n seconds to provide desired effect.

var numberOfDots = 3
func applySearchingEffect() {
    if let str = label.text {
        let range = NSMakeRange(str.length - numberOfDots, numberOfDots)
        var string = NSMutableAttributedString(string: str)
        string.addAttribute(NSForegroundColorAttributeName, value: UIColor.clearColor(), range: range)
        
        label.attributedText = string
        numberOfDots--
        if numberOfDots < 0 {
            numberOfDots = 3
        }
    }
}