UITableViewAlertForLayoutOutsideViewHierarchy error: Warning once only (iOS 13 GM)

Question

I am getting a strange error with iOS13 when performing a Segue and I can\'t figure out what it means, nor can I find any documentation for this error. The problem is that t

Answer 1

extension UIView {

  func rootView() -> UIView {
     var view = self
     while view.superview.isNotNil {
         view = view.superview!
     }
     return view
  }

  var isOnWindow: Bool {
     return self.rootView() is UIWindow
    }
  }

then you just need to check if your tableView isOnWindow like...

if self.tableView.isOnWindow {
/// do stuff
}

Disclaimer: as the documentation explains, you may need to defer the call which means that there is no warranty your method will be called again so it's your responsibility to perform your update when isOnWindow is true.