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I write a swift class which draw some arcs and graphs use iOS Core Graphics. I want to rescale these arcs when I zoom in and zoom out. how can I do it or how can I search it this problem's answer? Thank u :) here is my scroll views zoom code below;

 @IBOutlet weak var scrollview: UIScrollView!
var statsView: StatsView!


override func viewDidLoad() 
 super.viewDidLoad()

 self.statsView = StatsView(frame: CGRect(x: 0, y: 0, width: 720.0, height: self.scrollview.bounds.height))
 self.scrollview.addSubview(self.statsView)
 //mark:- for scrolling
 scrollview.delegate = self
 let scrollViewFrame = scrollview.frame
 let scaleWidth = scrollViewFrame.size.width / scrollview.contentSize.width
 let scaleHeight = scrollViewFrame.size.height / scrollview.contentSize.height
 //let minScale = min(scaleWidth, scaleHeight);


override func viewDidAppear(_ animated: Bool) 
 super.viewDidAppear(animated)

 statsView.drawStatsView(color: #colorLiteral(red: 0.9529411793, green: 0.6862745285, blue: 0.1333333403, alpha: 1), average: 100, min: 90, max: 110, name: "H")
 statsView.drawStatsView(color: #colorLiteral(red: 0.7450980544, green: 0.1568627506, blue: 0.07450980693, alpha: 1), average: 120, min: 102, max: 122, name: "A")
 statsView.drawStatsView(color: #colorLiteral(red: 0.2392156869, green: 0.6745098233, blue: 0.9686274529, alpha: 1), average: 145, min: 130, max: 150, name: "Y")

override func viewDidLayoutSubviews() 
 scrollview.contentSize = CGSize(width: 720.0, height: scrollview.frame.height)
 scrollview.alwaysBounceHorizontal = false
 scrollview.bounces = false
 scrollview.clipsToBounds = true

func viewForZooming(in scrollView: UIScrollView) -> UIView? 
 print("we re zooming yey")
 return statsView