<module> error: X is overriding existing Objective-C class
colinmford last edited by gferreira
Occasionally I'll try to make a tool that subclasses a vanilla or an Objective-C object like so:
class MyWindow(vanilla.Window): ... class MyObject(NSObject): ...
and either I'll get this error on the first call in RoboFont... or, more strangely, it might work once, and THEN I'll get the following error:
<module> error: MyWindow is overriding existing Objective-C class
My question is: Why am I getting this error, and is there a way to subclass a vanilla object in RF?
For NSObjects or any subclass of such a NSObject (that is any AppKit object) there can only be one with the same name during a runloop.
Try to save your nsObjects in a separate file and import the required classes. Try to give a good unique name:
As a last resort you can use the embedded helper that renames the class.
import AppKit from lib.tools.debugTools import ClassNameIncrementer class MyObject(AppKit.NSObject, metaclass=ClassNameIncrementer): pass
but never use
ClassNameIncrementerin production code, only during testing.
colinmford last edited by
Thanks, @frederik! I had no idea about the metaclass before, seems pretty useful for debugging.