I think this is a bit difficult to understand compared with the commonly used implementation. For example, It's does not need set some property in UIViewController for post data to next UIViewController when tap a button. Swift @IBAction func complete(_ sender: Any) { let text = "some data"    let drawingViewController = DrawingViewController(text: text) navigationController?.pushViewController(drawingViewController, true) }

Seems the best way for me is go to the Flutter world. HeHe.