Wkwebview is not captured inside CustomView

I've a CustomView. The CustomerVIew contains 2 views, one more custom view which has WkWebview & one normal xib for branding.

This Customview is added to anotherview, screenshotview like shown below.

anothercustomtView contains the WKWebView

ContentView

Code Block  
  let contentView = UIView(frame: screenshotBounds)
  contentView.backgroundColor = UIColor.white
  contentView.addSubview(anothercustomtView)
  contentView.addSubview(xibbrandingView)

ScreenshotView

Code Block 
let screenshotView = UIView(frame: screenshotBounds.insetBy(dx: -padding, dy: -padding))
screenshotView.addSubview(contentView)

I am trying to capture the complete screen using

Code Block 
   UIGraphicsBeginImageContextWithOptions(screenshotView.bounds.size, true, 0)
   screenshotView.drawHierarchy(in: screenshotView.bounds, afterScreenUpdates: true)
   let screenshot = UIGraphicsGetImageFromCurrentImageContext()!
   UIGraphicsEndImageContext()

however except the WKWebView which I can see on screen rest everything is captured.

If I use self.view as below, I see even the wkwebview is captured.

Code Block  
UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, true, 0)
    self.view.drawHierarchy(in: self.view.bounds, afterScreenUpdates: true)
   let screenshot = UIGraphicsGetImageFromCurrentImageContext()!
   UIGraphicsEndImageContext()

Kind of stuck with this. Can anyone help with this? Thanks!