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If a method is defined in both a class and a category on that class, it is undefined which implementation will be called.
But how does this interact with inheritance? Specifically:
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“ A key idea in all object-oriented programming, is inheritance that a new class can base itself on an existing class. It's another form of code reuse.
In keeping with its clean and simple design, Objective C does not support multiple inheritance, though features have been developed to replace some of the functionality provided by multiple inheritance (see run-time section below). The root of the Objective C class hierarchy is the Object class.
Inheritance allows programmers to create classes that are built upon existing classes, to specify a new implementation while maintaining the same behaviors (realizing an interface), to reuse code and to independently extend original software via public classes and interfaces.
Lets just put it this way. Don't override methods using categories, period, ever, end of answer.
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