Question

您可以在didChangeDependencies中调用具有共享首选项的布尔值吗？

我需要在构建方法中使用isToolTipTapped作为条件，但似乎不起作用。

@override
  void didChangeDependencies() async {
    isToolTipTapped = await checkIfToolTipTapped();
    print('$isToolTipTapped');
  
    super.didChangeDependencies();
  
  }


Future<bool> checkIfToolTipTapped() async {
    SharedPreferences prefs = await SharedPreferences.getInstance();
    return prefs.getBool(SchnapConfigValues.toolTipTapped ?? false);
  }


print('$isToolTipTapped'); does return the boolean in didChangeDependencies method but my build method doesn't take the value

Answer 1

我认为您应该尝试以下代码：

class _DemoPageState extends State<DemoPage> {
  static const TAG = 'DemoPage';
  bool isToolTipTapped;

  Future<bool> checkIfToolTipTapped() async {
    SharedPreferences prefs = await SharedPreferences.getInstance();
    return prefs.getBool(SchnapConfigValues.toolTipTapped ?? false);
  }
  
  
  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    checkIfToolTipTapped().then((value) {
      setState(() {
        isToolTipTapped = value;
      });
    });
  }
  
  @override
  Widget build(BuildContext context) {
    if (isToolTipTapped == null) {
      return Your Loading Widget...
    } else {
      //Handle logic with isToolTipTapped
    }
  }
}

Answer 2

public IActionResult GetAssets(DateTime? ClosingDT = null, string InvestmentLevel = "child", string planCode = null, string PartyID = null)
        {
            try
            {
                var ContactInvBal = Repo.GetFund(this.UserToken.ContactID, ClosingDT, InvestmentLevel, planCode, PartyID);
                decimal TotalAll = ContactInvBal.InvestmentBalances.Sum(b => b.ClosingBalance.HasValue ? b.ClosingBalance.Value : 0.00M);
                var result = ContactInvBal.InvestmentBalances.Select(b => new ContactAssets()
                {
                    Type = "",
                    AssetClass = b.AssetClass,
                    Balance = b.ClosingBalance,
                    Units = b.ClosingUnit,
                    Price = b.ClosingPrice,
                    PercentOfTotal = Convert.ToDecimal(b.ClosingBalance / TotalAll)
                });
                return Ok(result);
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, ex.Message);
                return BadRequest(ex.Message);
            }
        }

在didChangeDependencies

2 个答案: