沒有為“Future<UserCredential>”型別定義getter'user'。（火庫授權）

我正在為 Flutter 學習一門課程，我認為這門課程有點舊，我在這條線上收到了這樣的錯誤；

@override
  Future<auth.User?> logInWithEmailAndPassword(
      {@required String? email,
        @required String? sifre,
      }) async {
    try{
      final credential = _firebaseAuth.signInWithEmailAndPassword(
        email: email!,
        password: sifre!,
      );
      return credential.user;
    } on auth.FirebaseAuthException catch (err) {
      throw Failure(code: err.code, message: err.message);
    } on PlatformException catch (err) {
      throw Failure(code: err.code, message: err.message);
    }
  }

回傳憑據。用戶；

沒有為“未來”型別定義 getter 'user'。（檔案）嘗試匯入定義“user”的庫，將名稱更正為現有 getter 的名稱，或者定義名為“user”的 getter 或欄位。

視頻中沒有這樣的問題。我該如何解決？

import 'package:basla/config/paths.dart';
import 'package:basla/depolar/depolar.dart';
import 'package:basla/models/models.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_auth/firebase_auth.dart' as auth;
import 'package:flutter/services.dart';
import 'package:meta/meta.dart';

class AuthRepository extends BaseAuthRepository {
  late final FirebaseFirestore _firebaseFirestore;
  late final auth.FirebaseAuth _firebaseAuth;

  AuthRepository({
    FirebaseFirestore? firebaseFirestore,
    auth.FirebaseAuth? firebaseAuth,
  })  : _firebaseFirestore = firebaseFirestore ?? FirebaseFirestore.instance,
        _firebaseAuth = firebaseAuth ?? auth.FirebaseAuth.instance;

  @override
  Stream<auth.User?> get user => _firebaseAuth.userChanges();

  @override
  Future<auth.User?> signUpWithEmailAndPassword(
      {@required String? kullaniciadi,
      @required String? email,
      @required String? sifre}) async {
    try {
      final credential = await _firebaseAuth.createUserWithEmailAndPassword(
        email: email!,
        password: sifre!,
      );
      final user = credential.user;
      _firebaseFirestore.collection(Paths.users).doc(user?.uid).set({
        'Kullan?c? Ad?': kullaniciadi,
        'Email': email,
        'Takipci': 0,
        'Takip ': 0
      });
      return user;
    } on auth.FirebaseAuthException catch (err) {
      throw Failure(code: err.code, message: err.message);
    } on PlatformException catch (err) {
      throw Failure(code: err.code, message: err.message);
    }
  }

  @override
  Future<auth.User?> logInWithEmailAndPassword(
      {@required String? email,
        @required String? sifre,
      }) async {
    try{
      final credential = _firebaseAuth.signInWithEmailAndPassword(
        email: email!,
        password: sifre!,
      );
      return credential.user;
    } on auth.FirebaseAuthException catch (err) {
      throw Failure(code: err.code, message: err.message);
    } on PlatformException catch (err) {
      throw Failure(code: err.code, message: err.message);
    }
  }

  @override
  Future<void> logOut() async {
    await _firebaseAuth.signOut();
  }
}

uj5u.com熱心網友回復：

更改final credential = _firebaseAuth.signInWithEmailAndPassword(為final credential = await _firebaseAuth.signInWithEmailAndPassword(。

您必須等待signInWithEmailAndPassword完成才能回傳credential.user。

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