将项目添加到 obs 列表后，Flutter getX 未更新 UI

Question

我正在使用 GetX 来管理我的电子商务应用程序的状态，但我被购物车困住了。

我正在使用 Sqflite 包在本地存储购物车。

问题：当我将产品添加到购物车列表时它不会自动更新，直到我重新启动应用程序我看到添加的项目

推车控制器

      addProductToCart(ProductModel product) async {
        List<Map> items =
            await _repository.getLocalByCondition('carts', 'productId', product.id);
        if (items.length > 0) {
          product.quantity = items.first['productQuantity'] + 1;
          return await _repository.updateLocal(
              'carts', 'productId', product.toMap());
        }
    
        product.quantity = 1;
        return await _repository.saveLocal('carts', product.toMap());
      }
    
      
    
      @override
      void onInit() {
        super.onInit();
        getCarts();
      }


 

加入购物车产品详情

  _addToCart(BuildContext context, ProductModel product) async {
    int result = await _cartController.addProductToCart(product);
    if (result > 0) {
      Fluttertoast.showToast(msg: 'Item added to cart successfully!');
    } else {
      Fluttertoast.showToast(msg: 'Error to add product!');
    }
  }

购物车屏幕

Obx(() {
      return Scaffold(
          appBar: AppBar(
              title: Text('Cart (${_cartController.cartList.length} items)',
                  style: TextStyle(color: Colors.black))),
          bottomNavigationBar: InkWell(
              onTap: () {
                //_checkout(_cartController.cartList);
              },
              child: Container(
                color: Colors.black,
                height: 55,
                margin: EdgeInsets.all(8),
                child: Row(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: [
                    Text(
                      'Checkout',
                      style: TextStyle(color: Colors.white),
                    ),
                    SizedBox(
                      width: 10,
                    ),
                    Text(
                      '£' + _cartController.total.toString(),
                      style: TextStyle(color: Colors.white),
                    )
                  ],
                ),
              )),
          body: _cartController.loading.isTrue
              ? Center(child: CircularProgressIndicator())
              : _cartController.cartList.length > 0
                  ? ListView.builder(
                      padding:
                          EdgeInsets.symmetric(horizontal: 8, vertical: 12),
                      itemBuilder: (context, index) {
                        return Dismissible(
                          key: Key(this
                              ._cartController
                              .cartList[index]
                              .id
                              .toString()),
                          onDismissed: (val) async {
                          var x=  await _cartController.deleteCartItem(
                                index, this._cartController.cartList[index].id);
                                if(x!>0)        Fluttertoast.showToast(msg: 'deleted');
                                else{        Fluttertoast.showToast(msg: x.toString());
}

                          },
                          background: Container(
                              child: Align(
                                  alignment: Alignment.centerRight,
                                  child: Padding(
                                    padding: const EdgeInsets.only(right: 28.0),
                                    child: Icon(
                                      Icons.delete_outline_outlined,
                                      size: 36,
                                      color: Colors.white,
                                    ),
                                  )),
                              color: Colors.redAccent),
                          child: Card(
                            elevation: 5,
                            shape: OutlineInputBorder(
                                borderRadius: BorderRadius.all(
                              Radius.circular(7),
                            )),
                            child: Container(
                              margin: EdgeInsets.all(4),
                              height: 120,
                              child: Row(
                                children: [
                                  Expanded(
                                    flex: 3,
                                    child: ClipRRect(
                                      borderRadius: BorderRadius.only(
                                          topLeft: Radius.circular(5),
                                          topRight: Radius.circular(5)),
                                      child: Image.network(
                                        _cartController.cartList[index].photo,
                                        width: 150,
                                        height: 120,
                                        fit: BoxFit.cover,
                                      ),
                                    ),
                                  ),
                                  Expanded(
                                      flex: 5,
                                      child: Column(
                                        mainAxisAlignment:
                                            MainAxisAlignment.center,
                                        crossAxisAlignment:
                                            CrossAxisAlignment.start,
                                        children: [
                                          Padding(
                                            padding: const EdgeInsets.all(8.0),
                                            child: Text(
                                              _cartController
                                                  .cartList[index].name,
                                              overflow: TextOverflow.clip,
                                              style: TextStyle(
                                                  fontWeight: FontWeight.w500,
                                                  fontSize: 16),
                                            ),
                                          ),
                                          Padding(
                                            padding: const EdgeInsets.all(8.0),
                                            child: Text(
                                              '${_cartController.cartList[index].price - _cartController.cartList[index].discount} ' +
                                                  " x " +
                                                  _cartController
                                                      .cartList[index].quantity
                                                      .toString(),
                                              style: TextStyle(
                                                  fontWeight: FontWeight.w500),
                                            ),
                                          ),
                                        ],
                                      )),
                                  Expanded(
                                      child: Column(
                                    mainAxisAlignment: MainAxisAlignment.start,
                                    children: [
                                      IconButton(
                                        icon: Icon(Icons.keyboard_arrow_up),
                                        onPressed: () {
                                          _cartController.total.value += this
                                                  ._cartController
                                                  .cartList[index]
                                                  .price -
                                              this
                                                  ._cartController
                                                  .cartList[index]
                                                  .discount;
                                          this
                                              ._cartController
                                              .cartList[index]
                                              .quantity++;
                                        },
                                      ),
                                      Text(_cartController
                                          .cartList[index].quantity
                                          .toString()),
                                      IconButton(
                                        icon: Icon(Icons.keyboard_arrow_down),
                                        onPressed: () {
                                          if (_cartController
                                                  .cartList[index].quantity >
                                              1) {
                                            _cartController.total.value -= (this
                                                    ._cartController
                                                    .cartList[index]
                                                    .price -
                                                this
                                                    ._cartController
                                                    .cartList[index]
                                                    .discount);
                                            this
                                                ._cartController
                                                .cartList[index]
                                                .quantity--;
                                          }
                                        },
                                      ),
                                    ],
                                  ))
                                ],
                              ),
                            ),
                          ),
                        );
                      },
                      itemCount: _cartController.cartList.length,
                    )
                  : Center(
                      child: Text('Your Shopping cart is empty'),
                    ));
    });

Answer 1

您需要在 _cartController.cartList 中添加产品。

_addToCart(BuildContext context, ProductModel product) async {
  cartList.add(product);
  .... 
 }