有時候會在pod install的時候，有這種黃色警告。
這是在 Stack Overflow 上看到的回復。經(jīng)驗證有效：
I was able to fix this problem by doing the following (step by step):
Go to Build Settings
At the top select All and Combined
Under Build Options you should see Always Embed Swift Standard Libraries and it is bold.
Click on it and click delete (<-). It should now be unbolded. (Normal text = inherit)
Pod install and the error/errors should go away!
