有两个问题:

1)Google Developer网站上说明的手动导入框架的说明有些含糊.因此，我遵循以下教程来导入框架并设置我的开发人员帐户: http://www.mokacoding.com/blog/setting-up-firebase-without-cocoapods/

1) The instructions stated on the Google Developer website for importing the frameworks manually, are somewhat lacklustre. So I followed the following tutorial to import the frameworks and setup my developer account: http://www.mokacoding.com/blog/setting-up-firebase-without-cocoapods/

2)导入所有框架/资源/plist文件/等之后，您仍然会遇到以下构建错误:

2) After you have imported all the frameworks/resources/plist files/etc... you will still get the following build error:

找不到"FirebaseCore/FirebaseCore.h"文件

'FirebaseCore/FirebaseCore.h' file not found

为了解决此问题，请清洁您的Xcode项目，然后关闭该项目.然后重新打开该项目并重新生成它.现在可以正常工作-也许Xcode项目现在可以看到框架文件或某些东西了……不确定，但这是唯一对我反复起作用的解决方案.

In order to get around this issue, clean your Xcode project and then close the project. Then reopen the project and rebuild it. It will now work - perhaps the Xcode project can now see the framework files or something... not really sure, but it's the only solution that has repeatedly worked for me.

更新

我认为这只是Xcode 9.x的一个错误，自从我升级到Xcode 10以来，我就再也没有这个问题了.只需照常导入所有框架，然后构建并运行项目即可.

I think this was just a bug with Xcode 9.x, ever since I upgraded to Xcode 10, I haven't had this issue at all. Just import all the frameworks as usual and build and run the project.