除非verifyPhoneNumber方法完成，否則不想完成Future

我想驗證一個用戶的電話號碼，然后只允許該用戶注冊。但是為此，verifyPhoneNumber即使我申請await，當我打電話時也不會等到驗證完成。它執行下一行。所以我想要做的是除非verificationCompleted、verificationFailed、codeAutoRetrievalTimeout中的任何一個完成，否則我想等待然后只執行為資料庫中的用戶創建檔案的代碼。任何幫助將不勝感激！！！

static Future signUp(BuildContext context, String name, String phoneNumber,
      String email, String gender) async {
    await auth.verifyPhoneNumber(
        phoneNumber: phoneNumber,
        verificationCompleted: (credential) async {
          await auth.signInWithCredential(credential);
        },
        verificationFailed: _verificationFailed,
        codeSent: (String verificationId, int resendToken) async{
          await _codeSent(verificationId, resendToken, context);
        },
        codeAutoRetrievalTimeout: (String timeout) {});

    if (auth.currentUser != null) {
      await DB.users.doc(auth.currentUser.uid).set({
        name: name,
        phoneNumber: phoneNumber,
        email: email,
      });
    }
    return;
  }

謝謝！！

uj5u.com熱心網友回復：

FirebaseAuth.verifyPhoneNumber 開始驗證。我希望它Future在發出驗證請求時完成回傳，而不是在接收者完成驗證時完成。

如果你真的想要一個Future可以被await編輯的，你可以使用一個Completer. 使用它來轉換完成回呼集的一種方法：

    var verificationCompleter = Completer<PhoneAuthCredential>();
    await auth.verifyPhoneNumber(
        phoneNumber: phoneNumber,
        verificationCompleted: (credential) {
          verificationCompleter.complete(credential);
        },
        verificationFailed: (error) {
          verificationComplete.completeError(error);
        },
        codeSent: (String verificationId, int resendToken) async{
          await _codeSent(verificationId, resendToken, context);
        },
        codeAutoRetrievalTimeout: (String id) {
          verificationComplete.completeError(
            TimeoutException('Verification request timed out'),
          );
        },
    );

    PhoneAuthCredential credential;
    try {
      credential = await verificationComplete.future;
    } on FirebaseAuthException catch (e) {
      _verificationFailed(error);
      return;
    } on TimeoutException {
      // Handle a timeout error however you like.
      // ...
      return;
    }

    await auth.signInWithCredential(credential);
    if (auth.currentUser != null) {
      // ...
    }

uj5u.com熱心網友回復：

你可以你.then條款。所以在你的代碼中你可以像下面一樣附加它。該value引數包含從等待該then子句的代碼傳遞的任何資訊。

static Future signUp(BuildContext context, String name, String phoneNumber,
  String email, String gender) async {
await auth.verifyPhoneNumber(
    phoneNumber: phoneNumber,
    verificationCompleted: (credential) async {
      await auth.signInWithCredential(credential);
    },
    verificationFailed: _verificationFailed,
    codeSent: (String verificationId, int resendToken) async{
      await _codeSent(verificationId, resendToken, context);
    },
    codeAutoRetrievalTimeout: (String timeout) {}).then((value){
        //Code you want to execute after the above is completed.
        if (auth.currentUser != null) {
           await DB.users.doc(auth.currentUser.uid).set({
              name: name,
              phoneNumber: phoneNumber,
              email: email,
           });
        }
        return;
      });
}

標籤：扑 镖 异步 异步等待 firebase-身份验证

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