Swift Animate lines with dots - ios

Question

I have created multiple circles (points) using CAShapeLayer and multiple lines connecting to those circles. Then i animate those circles. what i want to do is animate connected lines along with dots. But only circles are animating not the lines. How can i achieve this? is there a way to update lines position?`
`
var points: [CAShapeLayer] = []
let positions: [CGPoint] = [CGPoint(x: 70, y: 100),
CGPoint(x: 140, y: 100),
CGPoint(x: 210, y: 100),
CGPoint(x: 70, y: 200),
CGPoint(x: 140, y: 200),
CGPoint(x: 210, y: 200)]
var lines:[CAShapeLayer] = []
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
createPoints()
}
override func viewDidLoad() {
super.viewDidLoad()
}
func createPoints(){
for (index,position) in positions.enumerated() {
let point = CAShapeLayer()
point.path = UIBezierPath(roundedRect: CGRect(x: 0, y: 0, width: 10, height: 10), cornerRadius: 5).cgPath
point.frame = CGRect(x: position.x, y: position.y, width: 10, height: 10)
point.fillColor = UIColor.red.cgColor
points.append(point)
view.layer.addSublayer(points[index])
}
animatePosition(point: points[0])
drawLines()
}
func drawLines(){
for (index,_) in positions.enumerated() {
let path = UIBezierPath()
//Not completed
//set line's start position to dots position
path.move(to: points[index].position)
//set line's end position to dots position
path.addLine(to: points[index+1].position)
let line = CAShapeLayer()
line.fillColor = #colorLiteral(red: 0, green: 0, blue: 0, alpha: 0).cgColor
line.strokeColor = #colorLiteral(red: 1, green: 0, blue: 0, alpha: 1).cgColor
line.lineWidth = 1
line.strokeStart = 0
line.path = path.cgPath
lines.append(line)
view.layer.addSublayer(line)
}
}
func animatePosition(point: CAShapeLayer) {
let animation = CABasicAnimation(keyPath: "position")
animation.fromValue = [10, 10 ]
animation.toValue = [100, 100]
animation.autoreverses = true
animation.repeatCount = .infinity
animation.isAdditive = true
point.add(animation, forKey: "pointStart")
// line.add(animation, forKey: "positionLine")
self.view.setNeedsLayout()
}
What i want is some thing like this: