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Objective-C Language Manual

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4.4 Posing as a Superclass

Describe `poseAs:'. Changing Behavior of Inherited Methods. Substituting a your new class for some old class. You can use this to override methods that have already been defined in the implementation of the old class.

Use subclassing to override method behavior in new classes you write. Use posing to override method behavior in preexisting subclasses of the posed class.

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