尝试在 iOS 设备中颤振运行时，获取 s6Runner11AppDelegateC11application

Question

我第一次尝试在 iOS (iPhone 8) 模拟器上使用命令 flutter clean 和 flutter run 运行 Flutter 应用程序。我收到以下错误：

Configuring the default Firebase app...
Configured the default Firebase app __FIRAPP_DEFAULT.
*** First throw call stack:
(
        0   CoreFoundation                      0x00007fff23e39f0e __exceptionPreprocess + 350
        1   libobjc.A.dylib                     0x00007fff50ad79b2 objc_exception_throw + 48
        2   CoreFoundation                      0x00007fff23e39d4c +[NSException raise:format:] + 188
        3   Runner                              0x0000000106f1d519 +[FIRApp appWasConfiguredTwice:usingOptions:] + 185
        4   Runner                              0x0000000106f1cf92 +[FIRApp configureWithName:options:] + 306
        5   Runner                              0x0000000106f1cd1f +[FIRApp configureWithOptions:] + 143
        6   Runner                              0x0000000106f1cc6d +[FIRApp configure] + 157
        7   Runner                              0x0000000106eb81a4 $s6Runner11AppDelegateC11application_29didFinishLaunchingWithOptionsSbSo13UIApplicationC_SDySo0j6LaunchI3KeyaypGSgtF + 212
        8   Runner     <…>
This is taking longer than expected...

所以我怀疑该错误与我的“Firebase”依赖项有关。

1) 我的 podfile 如下：

  pod 'Flutter', :path => 'Flutter'
  pod 'Firebase/Analytics'
  pod 'Firebase/Auth'
  pod 'Firebase/Firestore'

2) 我确实看到我的 GoogleService-Info.plist 位于 /ios/Runner 下。

3) 我的AppDelegate.swfit如下：

import UIKit
import Flutter
import Firebase

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {
    GeneratedPluginRegistrant.register(with: self)
    FirebaseApp.configure()
    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }
}

我应该如何解决这个问题？

Answer 1

您的日志输出开始于：

Configuring the default Firebase app...
Configured the default Firebase app __FIRAPP_DEFAULT.

这来自 Flutter 插件，如果 Firebase 应用尚未初始化，它会尝试初始化它。

之后会调用didFinishLaunchingWithOptions 方法，因此在使用Flutter 插件时，无需按照iOS SDK 文档中所述在didFinishLaunchingWithOptions 方法中配置Firebase 应用程序。

所以删除AppDelegate.swift中的更改如下：

import UIKit
import Flutter
import Firebase // Remove this line

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {
    GeneratedPluginRegistrant.register(with: self)
    FirebaseApp.configure()  // Remove this line
    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }
}

因为这令人困惑，它可能会在未来发生变化或有更好的文档，请观看https://github.com/FirebaseExtended/flutterfire/issues/2466