Error on CupertinoApp about keyboard_avoider

[martinrybak]

Regarding your original issue, KeyboardAvoider works by wrapping your content in a ScrollView to make it scrollable. So your content has to play nice inside a ScrollView, which means no widgets with unbounded height.

Re: your most recent comment: you can still use a Scaffold for the other features it offers (app bar, drawer, etc.). Just set resizeToAvoidBottomInset to false. Or you can give your TextField an explicit Material ancestor widget.

[martinrybak]

The issue is the Expanded widget inside your Column. That effectively gives the column infinite height. You can't have a widget of unbounded height inside a ScrollView, which is what KeyboardAvoider uses to scroll your content. Replace KeyboardAvoider with SingleChildScrollView and you'll get the same result. If you remove the Expanded widget, it will work fine.

[omarsawalhah]

But KeyboardAvoider is meant to avoid the keyboard automatically when text fields get focus, am I right.
In this post,
https://medium.com/flutter-nyc/avoiding-the-on-screen-keyboard-in-flutter-ae0e46ecb96c
you said we can use it instead of "Scaffold", if remove the scaffold widget, you will get an error that the "TextField" needs a wrapping Material widget.