我想实现firebase，为此我必须更新pod。然而，当我在控制台中输入pod repo update时，它什么也不做.它只是显示我的“Updating spec repo 'trunk'”，然后它显示我的提示。如果我在控制台中输入pod install，它会显示：

[!] Invalid `Podfile` file: /Users/tlobry/Desktop/Flutter/Generated.xcconfig must exist. If you're running pod install manually, make sure flutter pub get is executed first.
 #  from /Users/tlobry/Desktop/Podfile:16
 #  -------------------------------------------
 #    unless File.exist?(generated_xcode_build_settings_path)
 >      raise "#{generated_xcode_build_settings_path} must exist. If you're running pod install manually, make sure flutter pub get is executed first"
 #    end
 #  -------------------------------------------

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这是我的pubspec.yaml：

name: flash_chat
description: A new Flutter application.
version: 1.0.0+1
environment:
  sdk: ">=2.1.0<3.0.0"
dependencies:
  flutter:
    sdk: flutter
  cupertino_icons: ^0.1.2
  animated_text_kit: ^4.1.1
  firebase_core: ^1.0.3
  firebase_auth: ^1.0.2
  cloud_firestore: ^1.0.4
dev_dependencies:
  flutter_test:
    sdk: flutter
flutter:
  uses-material-design: true
  assets:
  - images/

型
这是我的Podfile：

# Uncomment this line to define a global platform for your project
platform :ios, '9.0'
# CocoaPods analytics sends network stats synchronously affecting flutter build latency.
ENV['COCOAPODS_DISABLE_STATS'] = 'true'
project 'Runner', {
  'Debug' => :debug,
  'Profile' => :release,
  'Release' => :release,
}
def flutter_root
  generated_xcode_build_settings_path = File.expand_path(File.join('..', 'Flutter', 'Generated.xcconfig'), __FILE__)
  unless File.exist?(generated_xcode_build_settings_path)
    raise "#{generated_xcode_build_settings_path} must exist. If you're running pod install manually, make sure flutter pub get is executed first"
  end
  File.foreach(generated_xcode_build_settings_path) do |line|
    matches = line.match(/FLUTTER_ROOT\=(.*)/)
    return matches[1].strip if matches
  end
  raise "FLUTTER_ROOT not found in #{generated_xcode_build_settings_path}. Try deleting Generated.xcconfig, then run flutter pub get"
end
require File.expand_path(File.join('packages', 'flutter_tools', 'bin', 'podhelper'), flutter_root)
flutter_ios_podfile_setup
target 'Runner' do
  use_frameworks!
  use_modular_headers!
  flutter_install_all_ios_pods File.dirname(File.realpath(__FILE__))
end
post_install do |installer|
  installer.pods_project.targets.each do |target|
    flutter_additional_ios_build_settings(target)
  end
end

型