Flutter Riverpod UI change only when i hot-reload

Question

When i call toggleFavorite function using a icon button the state is changing but ui not update but when i hot reload it's update. i checked some similar question on stackoverflow but i couldn't figure it out.

class ProductsNotyfier extends StateNotifier<List<Product>> {
  ProductsNotyfier()
      : super([
          Product(
            id: 'p1',
            title: 'Red Shirt',
            description: 'A red shirt - it is pretty red!',
            price: 29.99,
            imageUrl:
                'https://images.unsplash.com/photo-1602810320073-1230c46d89d4?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=687&q=80',
          ),
          Product(
            id: 'p2',
            title: 'Trousers',
            description: 'A nice pair of trousers.',
            price: 59.99,
            imageUrl:
                'https://images.unsplash.com/photo-1603252110971-b8a57087be18?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1170&q=80',
          ),
          
        ]);

  List<Product> get items {
    return [...state];
  }

  toggleFavorite(index) {
    items[index].isFavotie = !items[index].isFavotie;
  }

Hosam Hasan · Accepted Answer · 2022-01-10 11:27:46Z

1

you need to change the state not items :

   toggleFavorite(index) {
     state[index].isFavotie = !state[index].isFavotie;
     state = [...state];
  }

answered Jan 10, 2022 at 11:27

Hosam Hasan

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5 Comments

Nashaf Over a year ago

Thank you! I already tried this but still same void toggleFavorite(index) { state[index].isFavotie = !state[index].isFavotie; state = [...state]; }

Nashaf Over a year ago

this is how i use provider in icon button is this okay ?? ref.read(productsProvider.notifier).toggleFavorite(index);

Nashaf Over a year ago

this is the provider final productsProvider = StateNotifierProvider((ref) => ProductsNotyfier());

Hosam Hasan Over a year ago

Please share the code of the list that watches the state provider

Nashaf Over a year ago

ref.read(productsProvider.notifier).toggleFavorite(index);

Oprimus · Accepted Answer · 2022-01-18 07:00:57Z

0

Hot reload preserves the app state. It's faster as it does not rerun main() or ````initState()```. If you want to hot restart the app state, then use hot restart "R" (capital R) in the terminal in debug mode in VSCode or (⇧⌘\ in Android Studio, ⇧⌘F5 in VSCode). See docs here.

answered Jan 18, 2022 at 7:00

Oprimus

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Comments

Doan Thai · Accepted Answer · 2024-09-17 04:55:30Z

0

The state should be immutable. Use @immutable or lib @freezed for Product. See here.

toggleFavorite(index) {
  state = [
    for (final (i, product) in state.indexed)
      if (i == index)
        product.copyWith(isFavotie : !product.isFavotie )
      else
        product,
  ];
}

answered Sep 17, 2024 at 4:55

Doan Thai

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