问题
My objective-c project uses a static library and recently I just discovered that Xcode 8.1 does not give some warnings for the library. When a method implementation is missing in the app itself, I get a warning. But if a method implementation is missing in the library, I get no warning. It just crashes at run time.
Same for the switch statement with an enum. If a case is missing, Xcode would signal a warning, but not in the static library.
In previous versions of Xcode, I am sure I received those warnings in my library. And I never changed any Build Settings, I just keep all the default values.
More info:
When I open the static library itself as a project, I get all warnings. But when I open another project that includes the library (I dropped the mylibrary.xcodeproj file in my project and add it in the Link phase), I don't have the library warnings
回答1:
It was a bug in Xcode. It is now working well in Xcode Version 8.3 (8E162)
来源：https://stackoverflow.com/questions/41819127/in-a-static-library-xcode-8-1-does-not-detect-when-an-objective-c-method-is-not