Call objc methods that contain an underscore

[lukaskollmer]

How can I use objc_util to call Objective-C methods that contain underscores?

Usually, I'd write object._doSomethingWithParameter_(param), but the problem is that only the second underscore indicates a parameter. The first one is part of the method name. Pythonista however will convert that to the selector :doSomethingWithParameter:, which requires two parameters.

How do I call the following method:

- (void)_addActionWithTitle:(id)arg1 image:(id)arg2 style:(int)arg3 handler:(id)arg4;

[omz]

objc_util should usually be smart enough to figure this out automatically. If you attempt to call _doSomethingWithParam_, it will first try to translate that to :doSomethingWithParameter:, but if that method doesn't exist (which is very likely), it'll try all permutations of underscores and colons for replacing the underscores in the method name, and it should eventually arrive at _doSomethingWithParameter: (in this case, there are only 4 possible permutations).

There could theoretically be cases where both _doSomethingWithParameter and :doSomethingWithParameter: are valid methods (unlikely, but possible) – in those cases, you could construct an ObjCInstanceMethod manually like this: ObjCInstanceMethod(some_obj, '_doSomethingWithParameter:'). This would also be slightly faster because there's no guessing involved to figure out the correct selector.

Long story short, calling _addActionWithTitle_image_style_handler_ should "just work".