这发生在我身上是因为我已经有了Pod配置。我是iOS开发的新手，在搜索安装Alamofire + SwiftyJSON的说明时，无意中安装了不止一次库。对我来说，起作用的是:在“Pods”项目的“目标支持文件”文件夹中，我选择了两个正确的。xcconfig文件，并将它们拖到我的应用程序项目的“Pods”文件夹中。这允许在基本配置上选择正确的配置文件。

但是，如果我再次运行“pod install”，警告将更改为先前的.xcconfig文件。我试图从主项目中删除文件和旧的框架，但当我再次运行前面的命令时，给了我同样的警告，并在我的应用程序项目的“Pods”文件夹下创建文件“Pods.framework”。我忽略了它，尽管有两个框架，但它似乎运行正常。我不知道这是否正确，如果存在解决方案，它将受到欢迎。

你还应该确保在Podfile的根目录中没有pod，你应该像这样定义在许多目标中使用的所有pod:

def shared_pods
  pod 'ReactiveCocoa', '~> 2.5'
end
target 'app' do
  shared_pods
  pod 'RestKit'
end
target 'tests' do
  shared_pods
  pod 'OCMock'
end

您还可能需要删除libPods。libPods-app. a和libPods-app。A从目标依赖项，执行一个清洁，然后运行pod安装再次。

Add the relevent xcconfig files to your project. Cocoapods will have created them but you can't set them in Xcode until they are in the project. You probably want to add them to the Pods group where the other pods xcconfig files are. Right click and add files. Search for xcconfig files in your project folder or look in Pods/Target Support Files/[TARGET_NAME]/ (I have different cocoapods configured for each target (extension and main project this may be slightly different in your case) Go to project configurations in the Info of your main project For each target and configuration set the appropriate pods configuration. pod install again and you should see no errors.

Sorry my previous answer was unclear. This was just one of many errors i've got while trying to set up Cloud Firestore, so this answer is specific for that situation. In order to solve this error and make firebase work, eventually, you have to follow all of the steps from this page: https://firebase.flutter.dev/docs/firestore/overview/ . If you are having problems with generating the 'firebase_options.dart' file, then you need to follow the steps on this page: https://firebase.google.com/docs/cli#mac-linux-auto-script . The last step is optional, but it reduces build time, and I really don't know how or why, but it made some of other errors also disappear... Step 4. Improve iOS & macOS build times, from this page https://firebase.flutter.dev/docs/firestore/overview/. And off course, don't forget to add dependencies in pubspec.yaml: https://pub.dev/packages/firebase_core/install . There is also a great comment here about using Firebase.initializeApp() : https://stackoverflow.com/a/63492262/17626190

我只是在添加一些自定义构建配置后遇到了这个问题。我能看到下面:

Pods (target) > Target Support Files > Pods

它实际上已经创建了新的xcconfig文件，匹配新的构建配置，但由于某种原因，我无法在我的应用程序的项目目标中选择这些文件。

对我来说，固定它的是安装和使用椰子荚分解:

gem install cocoapods-deintegrate

然后运行:

pod deintegrate

紧随其后的是:

pod install

最简单的解决方案(在多次遇到这个问题后):

删除Podfile & Podfile。锁从你的项目库(保存Podfile的地方，这样你可以很容易地粘贴到新的Podfile) 运行'pod init' 编辑“Podfile”到你的遗嘱(添加你正在使用的pods) 运行'pod install'

这将在几分钟内重新创建所有内容并工作(不花费时间对“错误”进行逆向工程)。