This problem is caused by a known iOS linker bug, in which a static library category is not being loaded by Xcode, and is remedied by a small change to your
Go to Build Settings.
In the Linking subsection, look for the Other Linking Flags key.
To Other Linking Flags add the value
-force_load and the path to the
-force_load $(SRCROOT)/libXPush.a .
This command loads all objects and categories in a static library and will solve the problem.
Updated 3 months ago