backgroundColor
property is MaterialStateProperty<Color?>
type. You can check in Flutter documentation.
So you have to use MaterialStateProperty
class to apply color. A quick example :
TextButton(
child: Text('test'),
style: ButtonStyle(backgroundColor: MaterialStateProperty.all(Colors.red)),
onPressed: () {},
),
2022 Update
Since version 3.0.1, we can use MaterialStatePropertyAll
as const
.
So it’s a better approach, to use it :
TextButton(
child: Text('test'),
style: const ButtonStyle(
backgroundColor: MaterialStatePropertyAll(Colors.red),
),
onPressed: () {},
),