在视图中获取空值

我想获取库存数据,但不想获取。我在做没有模型的API集成,因为模型中存在一些问题,只是为了获取数据,并希望显示在我的视图中。

这是我通过API获取数据的服务类。

Future<dynamic> getInventory() async {
    var data;
    String? userId = await preferenceService.getuserId();
    String? accessToken = await preferenceService.getAccessToken();

    var response = await http.get(Uri.parse('${AppUrl.getInventory}/$userId'),
        headers: <String, String>{
          'Content-Type': 'application/json; charset=UTF-8',
          'Authorization': 'Barear $accessToken'
        });

    print("The data of the specific inventory ===========>>>>>>>> " +
        response.body.toString());
    if (response.statusCode == 200) {
      data = jsonDecode(response.body);
      print('This is futr dsta --->>>   $data');
    } else {
      data=[];
    }
    return data;
  }

这是我的控制器类,我正在使用上面的服务函数

Future getMyInvenoryFromService() async {
    try {
      
      isLoadingInventory(true);
      await inventoryService.getInventory().then((val) {
        if (val != []) {
          inventoryData = val;
         
        } else {
          inventoryData = [];
        }
      });
      
    } finally {
      isLoadingInventory(false);
    }
  }

但当我使用inventoryData(在控制器中)访问数据时,我会得到null,但在控制器中,调试时我会得到值。但我不明白为什么我在视图中接收空值。

这是我的观点,

 class _UserInventoryScreenState extends State<UserInventoryScreen> {
      InventoryController inventoryController = Get.put(InventoryController());
      InventoryService inventoryService = InventoryService();
      GiftController giftController = Get.put(GiftController());
      GiftStorageService giftStorageService = GiftStorageService();
    
      @override
      void initState() {
        super.initState();
        /*Future delay() async {
          await new Future.delayed(new Duration(milliseconds: 3000), () {
            inventoryController.getMyInvenoryFromService();
          });
        }*/
    
        Timer.run(() {
          inventoryController.getMyInvenoryFromService();
         
        });
      }
    
      @override
      Widget build(BuildContext context) {
       
        return Scaffold(
            backgroundColor: AppColors.pinkAppBar,
            appBar: AppBar(
              elevation: 0,
              backgroundColor: Colors.transparent,
              leading: InkWell(
                  onTap: () {
                    Get.back();
                  },
                  child: Icon(Icons.arrow_back)),
              title: Row(
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                children: [
                  Text('Inventory'),
                  InkWell(
                    onTap: () {
                      Get.to(AddInventoryScreen());
                    },
                    child: Container(
                      padding: EdgeInsets.symmetric(horizontal: 10, vertical: 5),
                      decoration:
                          BoxDecoration(border: Border.all(color: Colors.white)),
                      child: Text(
                        "Add Inventory",
                        style: TextStyle(fontSize: 16),
                      ),
                    ),
                  )
                ],
              ),
            ),
            body: Obx(() {
              return inventoryController.isLoadingInventory.value == true
                  ? Center(child: CircularProgressIndicator())
                  : ElevatedButton(
                      onPressed: () async {
                        await inventoryController.getMyInvenoryFromService();
                      
                      },
                      child: Text("${inventoryController.inventoryData.length}"),
    
    
    
              );