UnityWidgetController has to be initialized

[robertosw]

Describe the bug
Using UnityWidget() requires the use of a controller. This controller is shown in all examples without being initialised. However Current Flutter and Dart Versions require the initialisation.

To Reproduce
Steps to reproduce the behavior:

1. write: UnityWidgetController _unityWidgetController; in some class.
2. Get initialisation error

Expected behavior
Not being forced to initialise the Controller

Newest Flutter and Dart version
Unity: Ubuntu, 2021.1.3

[LokeshNakka]

late UnityWidgetController _unityWidgetController;

[robertosw]

Is this really safe to do? I can imagine, calling a method of the widget (at the wrong time) might result in some problems.

[timbotimbo]

The current example project is not null-safe, thats why you get these errors in a modern null-safe project.

Check out pull request #732 for a null-safe version.

That uses UnityWidgetController? instead of late, so you can always check if it is null first.