Flutter: Run method on Widget build complete

You could use

https://github.com/slightfoot/flutter_after_layout

which executes a function only one time after the layout is completed.
Or just look at its implementation and add it to your code 🙂

Which is basically

  void initState() {
    super.initState();
    WidgetsBinding.instance
        .addPostFrameCallback((_) => yourFunction(context));
  }