Array only containing certain type of object

Question

I want an array that can only contain a certain type of object.

How can I achieve this?

what you want to check? Like it contains string or int . in this way? — Nirav Jain, Feb 28 '13 at 05:24
@veelian: i done this before by using the category feature in iOS — Midhun MP, Feb 28 '13 at 06:02

score 1 · Accepted Answer · answered Feb 28 '13 at 05:21

You cannot do this. An NSMutableArray has the addObject method, whose parameter is an id and can be any NSObject-based object.

If you want to protect your array from accidently getting populated with bad data from other classes, make it a private ivar and access it using a public @property or method. The public method will check the class of the object that a caller is trying to add to the array before actually calling addObject.

Array only containing certain type of object

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