Flutter: setting an initial state from constructor

Question

I am trying to set the initial value of a boolean from a value passed into my widget. My attempt right now looks like:

const CustomLikeButton({
    Key? key,
    required this.liked,
  }) : super(key: key);

  final bool liked;

  @override
  State<CustomLikeButton> createState() => _CustomLikeButtonState();
}

class _CustomLikeButtonState extends State<CustomLikeButton> {
  bool _liked;

  @override
  void initState() {
    bool _liked = widget.liked;
    super.initState();
  }

but it is giving the error:

Non-nullable instance field '_liked' must be initialized.
Try adding an initializer expression, or a generative constructor that initializes it, or mark it 'late'.

Anyone know what is going wrong here?

Thank you!

pmatatias · Accepted Answer · 2022-10-13 03:13:36Z

2

its null safety you define bool _liked; but without any value.

you can try

late bool _liked;

or

bool _liked = false; // or true

or

bool? _liked;

then set the value you get from the constructor

 _liked = widget.liked

answered Oct 13, 2022 at 3:13

pmatatias

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