animatePolylineWithGradient.swift

    @objc func animatePolylineWithGradient() {
        //Iterate each valid coordinate on the path
        if i < path.count() {
            newPath.add(path.coordinate(at: i))
            newPolyline.path = newPath
            newPolyline.strokeWidth = 4
            newPolyline.spans = [GMSStyleSpan(style: .gradient(from: UIColor(rgb: 0x38726E), to: UIColor(rgb: 0x404969)))]
            newPolyline.map = mapView
            i += 1
        } else {
            resetTimer()
            startAnimationTimer()
        }
    }