Technical Q&A QA1490: Building Objective-C static libraries with categoriesBuilding Objective-C static libraries with categoriesQ: How do I fix "selector not recognized" runtime exceptions when trying to use category methods from a static library? A: If you're seeing a "selector not recognized" runtime exception when calling a category method that is implemented in a static library, you are hitting the link-time build issue described here, and need to add the -ObjC linke
