Question

我正在尝试使用flutter-fire软件包执行Firebase Phone身份验证（使用SMS），但是在“验证”过程中检查错误情况时遇到了一些障碍。

一个注意事项：投掷发生在ChangeNotifierProvider中，捕获发生在使用提供程序获取状态数据的单独小部件中。

当我尝试调试时，我看到抛出了错误，但是catch块没有被调用。

这是引发错误的地方（PhoneVerificationFailed函数）：

`

Future<void> verifyPhoneNumber(String phoneNumber) async {
    print("Verify Phone Number called");
    final PhoneCodeAutoRetrievalTimeout autoRetrieve = (String verId) {
      this._verificationID = verId;
    };

    final PhoneCodeSent smsCodeSent = (String verId, [int forceCodeResend]) {
      this._verificationID = verId;
      print("SMS Sent");
      this.smsSent = true;
      notifyListeners();
      throw (HttpException("Test"));
    };

    final PhoneVerificationCompleted verificationSuccessful =
        (AuthCredential user) {
      print("verified");
    };

    final PhoneVerificationFailed verificationFailed =
        (AuthException exception) {
      print("failed, ${exception.message}");
      throw (exception);
    };

    this._phoneNumber = phoneNumber;
    notifyListeners();

    var result = await FirebaseAuth.instance.verifyPhoneNumber(
      phoneNumber: phoneNumber,
      codeAutoRetrievalTimeout: autoRetrieve,
      codeSent: smsCodeSent,
      timeout: const Duration(seconds: 0),
      verificationCompleted: verificationSuccessful,
      verificationFailed: verificationFailed,
    );

    return result;
  }`

这是我的捕获代码：

`Future<void> _submitPhoneNumber() async {
    _formKey2.currentState.save();
    setState(() {
      _isLoading = true;
    });
    try {
      await Provider.of<Auth>(context, listen: false)
          .verifyPhoneNumber(_authData['phoneNo']);
      setState(() {
        _isLoading = false;
      });
    } catch (error) {
      print("Exception caught ${error.message}");
      errorSnackBar(error.message, "Close");
    }
  }

`

Edit：我正在https://dart.dev/codelabs/async-await#example-async-and-await-with-try-catch中的代码游乐场里玩耍，我看到只有Future返回某些内容时才捕获异常，即使返回类型为Future。这可能是根本原因吗？

Answer 1

您需要捕获抛出的异常。

 try {
      await Provider.of<Auth>(context, listen: false)
          .verifyPhoneNumber(_authData['phoneNo']);
      setState(() {
        _isLoading = false;
      });
  } on HttpException catch (e) {   // add on HttpException 
      print("Exception caught ${error.message}");
      errorSnackBar(error.message, "Close");
    }
  }

投掷但不追赶

1 个答案: