我在使用 firebase 登录功能时遇到了这个问题，我不知道如何解决。请帮忙，谢谢。

我的登录函数代码如下:

Future<void> signIn() async{
final formState = _formKey.currentState;
if(formState.validate()){
  //TODO login to firebase
  formState.save();
  try{
    FirebaseUser user = await FirebaseAuth.instance.signInWithEmailAndPassword(email: _email, password: _password);
    Navigator.push(context, MaterialPageRoute(builder: (context)=> Home(user: user)));
  }catch(e){
    print(e.details);
  }

}

我的 flutter 医生是这样的:

[✓] Flutter (Channel master, v1.4.20-pre.2, on Mac OS X 10.14.4 18E226, locale
zh-Hans-CN)

[✓] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
[✓] iOS toolchain - develop for iOS devices (Xcode 10.2)
[!] Android Studio (version 3.3)
✗ Flutter plugin not installed; this adds Flutter specific functionality.
✗ Dart plugin not installed; this adds Dart specific functionality.
[✓] IntelliJ IDEA Ultimate Edition (version 2018.1.8)
[✓] VS Code (version 1.33.1)
[✓] Connected device (1 available)

错误的输出是这样的:

 [VERBOSE-2:ui_dart_state.cc(148)] Unhandled Exception: 
    MissingPluginException(No implementation found for method  signInWithCredential on channel plugins.flutter.io/firebase_auth)
0      MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:300:7)
<asynchronous suspension>
1      FirebaseAuth.signInWithCredential (package:firebase_auth/src/firebase_auth.dart:278:54)
<asynchronous suspension>
2      FirebaseAuth.signInWithEmailAndPassword (package:firebase_auth/src/firebase_auth.dart:249:12)
3      _LoginPageState.signIn (package:pdc/Pages/Setup/signIn.dart:62:57)
<asynchronous suspension>
4      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:511:14)
5      _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:566:30)
6      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:166:24)
7      TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:240:9)
8      TapGestureR<…>

它发生在我的设备和 IOS 模拟器上，我没有在 android 上尝试过。 我已经尝试过 flutter clean，开始一个新项目，升级 cocoaPods。但是它们都对我的情况没有用。 感谢您的帮助。

更新问题

好像每当我尝试用firebase做点什么的时候，都会出现这样的问题。 我写了这样的代码来注册:

Future<void> signUp() async{
        if(_formKey.currentState.validate()){
      _formKey.currentState.save();
      FirebaseUser user = await FirebaseAuth.instance.createUserWithEmailAndPassword(email: _email, password: _password);
      Navigator.push(context, MaterialPageRoute(builder: (context)=> Home(user: user)));
    }

  }

我的代码的输出是

[VERBOSE-2:ui_dart_state.cc(148)] Unhandled Exception: MissingPluginException(No implementation found for method createUserWithEmailAndPassword on channel plugins.flutter.io/firebase_auth)
#0      MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:300:7)
<asynchronous suspension>
#1      FirebaseAuth.createUserWithEmailAndPassword (package:firebase_auth/src/firebase_auth.dart:108:54)
<asynchronous suspension>
#2      _LoginPageState.signUp (package:pdc/Pages/Setup/signIn.dart:78:55)
<asynchronous suspension>
#3      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:511:14)
#4      _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:566:30)
#5      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:166:24)
#6      TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:240:9)
#7      TapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:177:9)
#8      PrimaryPointerGestureRecognizer.handleEvent (package:flutter/src/gestures/recognizer.dart:436:9)

而且我确定我已经完成了 firebase 的设置并成功地将 flutter 应用程序与 firebase 连接起来。

最佳答案

我真的很难让 Firebase 正常工作。我认为这应该非常简单，因为 Flutter 和 Firebase 都是 Google 的产品。无论如何，我必须将此代码用于 iOS 中的 AppDelegate.m 文件:

#include "AppDelegate.h"
#include "GeneratedPluginRegistrant.h"

@import UIKit;
@import Firebase;

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application
didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
  [FIRApp configure];
  [GeneratedPluginRegistrant registerWithRegistry:self];
  return [super application:application didFinishLaunchingWithOptions:launchOptions]; // YES;
}
@end

你有没有尝试过这样的事情？

关于firebase - MissingPluginException(未在 channel plugins.flutter.io/firebase_auth 上找到方法 signInWithCredential 的实现)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/55704562/