相关疑难解决方法(0)

我已经将我的 flutter 包更新到最新版本，现在 IOS 不再工作了。

当我尝试更新 Pod 时，它显示此错误：

    [!] CocoaPods could not find compatible versions for pod "Firebase/CoreOnly":
    In Podfile:
    cloud_firestore (from `.symlinks/plugins/cloud_firestore/ios`) was resolved to 0.0.1, which depends on
    Firebase/Firestore (~> 6.0) was resolved to 6.0.0, which depends on
    Firebase/CoreOnly (= 6.0.0)

    cloud_functions (from `.symlinks/plugins/cloud_functions/ios`) was resolved to 0.0.1, which depends on
    Firebase/Functions (~> 5.18) was resolved to 5.18.0, which depends on
    Firebase/CoreOnly (= 5.18.0)

这是我的 pubspec.yaml（与 Firebase 相关）：

firebase_core: "^0.4.0"
firebase_auth: "^0.11.0"
firebase_analytics: "^3.0.0"  
cloud_firestore: "^0.11.0+1"
cloud_functions: "^0.3.0" …

我在podfile中有这个:

pod 'Firebase/Core'
pod 'Firebase/Messaging'

但得到这个错误:

[!]无法找到规格 Firebase/Core

我试过pod 'Firebase'还是找不到它.

Podfile:

# Uncomment this line to define a global platform for your project
# platform :ios, '8.0'
# Uncomment this line if you're using Swift
use_frameworks!

target 'caffetouch manager' do
    pod 'Firebase/Core'
    pod 'Firebase/Messaging'
    pod 'Alamofire', '~> 4.0.0'
    pod 'AlamofireNetworkActivityIndicator', '~> 2.0.1'
    pod 'IQKeyboardManagerSwift', '~> 4.0.6'
    pod 'MZFormSheetPresentationController', '~> 2.4.2'
    pod 'Kingfisher', '~> 3.1.3'
    pod "GMStepper"
    pod 'DKImagePickerController', '~> 3.4.0'
    pod 'Siren', '~> 1.0.2'
    pod 'Eureka', '~> 2.0.0-beta.1' …

这是我收到的错误。我尝试了 flutter clean 并更改了一些行的语法，但我是 dart 和 flutter 的新手，所以我不太确定。我也重新安装了可可豆荚和红宝石，但我收到了同样的错误。我还确保将 ruby​​ 更新到最新版本。

  [!] Invalid `Podfile` file: no implicit conversion of nil into String.
         #  from /Users/(name)/Downloads/Projects/doctor_consultation_app/ios/Podfile:57
         #  -------------------------------------------
         #      unless File.exist?(copied_framework_path)
         >        FileUtils.cp(File.join(cached_framework_dir, 'Flutter.framework'), copied_flutter_dir)
         #      end
         #  -------------------------------------------

这是我的 pod 文件。

  [!] Invalid `Podfile` file: no implicit conversion of nil into String.
         #  from /Users/(name)/Downloads/Projects/doctor_consultation_app/ios/Podfile:57
         #  -------------------------------------------
         #      unless File.exist?(copied_framework_path)
         >        FileUtils.cp(File.join(cached_framework_dir, 'Flutter.framework'), copied_flutter_dir)
         #      end
         #  -------------------------------------------