在 Gridview.builder 中使用 ChangeNotifierProvider.value 时遇到错误

Question

This is likely a mistake and is unsupported. If you're in this situation, consider passing a key unique to each individual constructor.

以上是反映 运行 带有 flutter 小部件作为子代码的代码的错误：-

    GridView.builder(
      padding: const EdgeInsets.all(10.0),
      itemCount: products.length,
      itemBuilder: (ctx, i) => ChangeNotifierProvider.value(
        value: products[i],
        child: ProductItem(
            ),
      ),
      gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
        crossAxisCount: 2,
        childAspectRatio: 3 / 2,
        crossAxisSpacing: 10,
        mainAxisSpacing: 10,
      ),
    )

Answer 1

这种情况可以通过使用指定的键来解决：-

    GridView.builder(
      padding: const EdgeInsets.all(10.0),
      itemCount: products.length,
      itemBuilder: (ctx, i) => ChangeNotifierProvider.value(
        key: Key("item$i"),
        value: products[i],
        child: ProductItem(
            ),
      ),
      gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
        crossAxisCount: 2,
        childAspectRatio: 3 / 2,
        crossAxisSpacing: 10,
        mainAxisSpacing: 10,
      ),
    )