如何更新提高的按钮上的标题压在特定索引的列表视图。生成器

你需要保持的标志 isAddedToCart 每个指数。 你可以实现它通过使用 Map. 事情是这样的：

// class variable scope.
Map<int, bool> isAddedToCartMap = {};

然后用它在你的部件：

ElevatedButton (
    // if isAddedToCartMap[index] not found, use false as default value.
    child: isAddedToCartMap[index]??false ? Text('Added to cart') : Text('Add to cart'),
     style: ElevatedButton.styleFrom(
       primary: Constants.primaryColor,
       onPrimary: Constants.appColor
     ),
     onPressed: () async{
       setState(() {
         isAddedToCartMap[index] = !isAddedToCartMap[index]??false;
       });
       
     },
  
   ),

所有项目都取决于 isAddedToCart 但你需要保存所选择的项目有单独的索引

List<int> _selected_item = List();

 ElevatedButton(
              child: _selected_item.contains(index)
                  ? Text('Added to cart')
                  : Text('Add to cart'),
              style: ElevatedButton.styleFrom(),
              onPressed: () async {
                setState(() {
                  // remove or add index to _selected_item
                  if (_selected_item.contains(index))
                    _selected_item.remove(index);
                  else
                    _selected_item.add(index);
                  print(index);
                });
              },
            )

完整的源代码

ListView.builder(
          itemCount: 5,
          itemBuilder: (context, index) {
            return ElevatedButton(
              child: _selected_item.contains(index)
                  ? Text('Added to cart')
                  : Text('Add to cart'),
              style: ElevatedButton.styleFrom(),
              onPressed: () async {
                setState(() {
                  // remove or add index to _selected_item
                  if (_selected_item.contains(index))
                    _selected_item.remove(index);
                  else
                    _selected_item.add(index);
                  print(index);
                });
              },
            );
          })