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I’m reading
Apple’s article about Objective-C runtime type encoding strings
and some methods have numbers in their type strings.
What do the numbers in v12@0:4@8 mean?
This looks like an encoding of a setter method like this:
To break it down:
vmeans void return type12means the size of the argument frame (12 bytes)@0means that there is an Objective-C object type at byte offset 0 of the argument frame (this is the implicitselfobject in each Objective-C method):4means that there is a selector at byte offset 4 (this is the implicit_cmdin every method, which is the selector that was used to invoke the method).@8means that there is another Objective-C object type at byte offset 8.