效果演示

需求说明

1. 多个页面存在相同的item
2. 点击收藏时需要多个页面同时被收藏
3. 局部刷新（仅刷新收藏icon）

字母后面的数字获取的是当前秒，为了验证是否是局部刷新

实现方案

1. ChangeNotifierProvider
2. Selector

部分源码说明

关于状态管理ChangeNotifierProvider的使用可以看这篇文章Flutter-状态管理-provider-ChangeNotifierProvider的用法

这里说明一下 Selector 的用法:
Selector 是provider的消费者,需要说明的是我们平常使用最多的是Consumer消费者，但是我们的需求是精准更新，也就是说 Selector 有能够控制是否需要更新状态的能力

Selector({
  Key? key,
  required ValueWidgetBuilder<S> builder,
  required S Function(BuildContext, A) selector,
  ShouldRebuild<S>? shouldRebuild,
  Widget? child,
}) : super(
        key: key,
        shouldRebuild: shouldRebuild,
        builder: builder,
        selector: (context) => selector(context, Provider.of(context)),
        child: child,
      );

核心代码：

Positioned(
    child: Selector<AppRecipeModel, bool>(
      builder: (BuildContext context, favourite, Widget? child) =>
          IconButton(
        icon: Icon(Icons.favorite,
            color: favourite ? Colors.red : Colors.white),
        onPressed: () {
          model.favourite = !favourite;
          context.read<AppRecipeModel>().toggle(model);
        },
      ),
      selector: (context, AppRecipeModel appRecipeModel) =>
          appRecipeModel.indexRecipeModelList[index]
              .favourite, //当favourite发生改变的时候会rebuild Selector的builder函数
    ),
    right: 10.0,
    top: 10.0)

AppRecipeModel：

class AppRecipeModel extends ChangeNotifier {
  final List<RecipeModel> _indexRecipeModelList = [];

  List<RecipeModel> get indexRecipeModelList => _indexRecipeModelList;

  final List<RecipeModel> _exploreRecipeModelList = [];

  List<RecipeModel> get exploreRecipeModelList => _exploreRecipeModelList;

  toggle(RecipeModel recipeModel) {
    for (var model in _indexRecipeModelList) {
      if (model.recipeId == recipeModel.recipeId) {
        model.favourite = recipeModel.favourite;
      }
    }

    for (var model in _exploreRecipeModelList) {
      if (model.recipeId == recipeModel.recipeId) {
        model.favourite = recipeModel.favourite;
      }
    }
    notifyListeners();
  }
}

源码地址

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