Question

I have code

[target invokeSelector:handler.successAction withObject:object];

It may call some methods. With object or without. It perfectly works in Debug, but crashes in Release:

Nov 20 21:55:13 efpies project[7202] <Warning>: >>>> selector: successfulLogin
Nov 20 21:55:13 efpies project[7202] <Warning>: >>>> target: <AppDelegate: 0x1f595a90>
Nov 20 21:55:13 efpies project[7202] <Warning>: >>>> object: <7b226d65 73736167 65223a22 5c753034 31325c75 30343435 5c753034 33655c75 30343334 205c7530 3434305c 75303433 305c7530 3433375c 75303434 305c7530 3433355c 75303434 385c7530 3433355c 75303433 64227d> NSConcreteMutableData
Nov 20 21:55:13 efpies project[7202] <Error>: -[AppDelegate invokeSelector:withObject:]: unrecognized selector sent to instance 0x1f595a90

Nov 20 21:56:12 efpies project[7205] <Warning>: >>>> selector: driversUpdated:
Nov 20 21:56:12 efpies project[7205] <Warning>: >>>> target: <DriversList: 0x1cd5ffd0>
Nov 20 21:56:12 efpies project[7205] <Warning>: >>>> object: (
    ) __NSArrayM
Nov 20 21:56:12 efpies project[7205] <Error>: -[DriversList invokeSelector:withObject:]: unrecognized selector sent to instance 0x1cd5ffd0

Those methods are available (and even presented in header file). What’s wrong? The data and objects are 100% correct

Answer 1

As it turned out, invokeSelector:withObject: is a category method in the static library. Categories from a static library don’t load automatically so you should write

-force_load $(BUILD_ROOT)/$(CONFIGURATION)$(EFFECTIVE_PLATFORM_NAME)/lib_name.a

to the Other linker flag field in target’s Build settings if it compiles as dependency for the target.