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Objective C MCQs

How can you add a new method foo to an existing class Bar?

Define a C function foo and then send Bar the extend:withSelector: message, e.g. [Bar extend: foo withSelector: @selector(foo:)].

Both "extend" options are correct.

Make a category, e.g. @interface Bar(Foo).

It's not possible.

Send Bar the "extend:" message, e.g. [Bar extend: foo].

Answer

Correct Answer: Make a category, e.g. @interface Bar(Foo).

Explanation:

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