func takeScreenShot() {
    
    let width = CGFloat(UIScreen.main.bounds.size.width)
    //Calculate the height considering the part you do not want to copy, such as the status bar
    let height = CGFloat(UIScreen.main.bounds.size.height/1.3)
    let size = CGSize(width: width, height: height)
    
    UIGraphicsBeginImageContextWithOptions(size, false, 0.0)
    
    //Export to view
    self.view.drawHierarchy(in: view.bounds, afterScreenUpdates: true)
    screenShotImage = UIGraphicsGetImageFromCurrentImageContext()!
    UIGraphicsEndImageContext()
  }

  //When you press the share button
  @IBAction func share(_ sender: Any) {
    
    //Take a screenshot
    takeScreenShot()
    
    let items = [screenShotImage] as [Any]
    
    //Share on the activity view
    let activityVC = UIActivityViewController(activityItems: items, applicationActivities: nil)
    
    //Modal appears
    present(activityVC, animated: true, completion: nil)
  }

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