Should I use null or an empty Container when I don't want to render a widget according to the a-CodePudding

I want to use a FloatingActionButton only if the platform is Android:

floatingActionButton: Platform.isIOS
  ? null
  : FloatingActionButton(
      child: Icon(Icons.add),
      onPressed: ...
    ),

Should I render an empty container instead? How should I deal with widgets that I don't want under specific conditions overall? Is it bad convention to use null widgets?

CodePudding user response：

Not bad convention to use null widgets.

Check from Flutter's source code, you could see the following:


class Scaffold extends StatefulWidget {
  /// Creates a visual scaffold for material design widgets.
  const Scaffold({
    Key? key,
    this.appBar,
    this.body,
    this.floatingActionButton,
    ...
   }

    final Widget? floatingActionButton;

}

floatingActionButton is optional as designed.

If you not use the property floatingActionButton , floatingActionButton is null too.

So not need render an empty container instead.To deal with widgets that I don't want under specific conditions overall, it is ok to use null widgets