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I am using a third party framework containing a category on NSData and having a static method dataUsingBase64String: in it. The framework got linked fine and code builds successfully. But I am getting unrecognized selector sent to class runtime error when this method gets called.

I have also tried adding -ObjC,-all_load flags in OTHER_LINKER_FLAGS of XCode with no luck..

sandy
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3 Answers3

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I guess your library is statically linked. A common problem in that is categories are not included or linked. You additionally need to add -all_load to the Other Linker Flags of the target which is using your static library.

Also check the below answers similar to your problem

Answer 1 - NSData Unrecognized selector sent to class

Answer 2 - Objective-C Category Causing unrecognized selector

Answer 3 - "unrecognized selector sent to instance" to a static library despite ObjC flag

I hope this helps

Haseeb Afsar
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Note: I needed to add framework in this way,

Framework Search Paths instead of adding frameworks to "Linked Frameworks and Libraries" section

Here, somehow the framework was not loaded even after adding-Objc or -all_load.

Finally, -framework in OTHER_LINKER_FLAGS did the trick for me.

Something about it from manpage,

-framework name[,suffix]
                 This option tells the linker to search for `name.frame-
                 work/name' the framework search path.  If the optional suffix
                 is specified the framework is first searched for the name
                 with the suffix and then without (e.g. look for `name.frame-
                 work/name_suffix' first, if not there try `name.frame-
                 work/name').
sandy
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If -Objc does not take effect, you can try to delete your Category from the project and drag it to the project again, and check Target membership.

yang singh
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