Swift 4 recipes: How to present share options when user takes a screenshot

share-screenshot.swift

  override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    NotificationCenter.default.addObserver(self, selector: #selector(handleScreenshot), name: Notification.Name.UIApplicationUserDidTakeScreenshot, object: nil)
  }
  
  override func viewDidDisappear(_ animated: Bool) {
    super.viewDidDisappear(animated)
    NotificationCenter.default.removeObserver(self, name: Notification.Name.UIApplicationUserDidTakeScreenshot, object: nil)
  }
  
  @objc func handleScreenshot() {
    //use any local image or fetch from a url
    let image = try! UIImage(data: Data(contentsOf: URL(string: "https://www.google.co.in/logos/doodles/2017/mohammed-rafis-93th-birthday-5885879699636224.2-l.png")!))
    let urlString = "https://www.google.com/any-link-to-share"
    
    let activityVC = UIActivityViewController(activityItems: [urlString, image], applicationActivities: nil)
    present(activityVC, animated: true, completion: nil)
    
    //this is required for iPad since activityVC defaults to popover presentation
    if let popOver = activityVC.popoverPresentationController {
      popOver.sourceView = self.view
    }
  }