Protocols in Objective-C

Question

What is the difference between id and id<NSObject>. Isn't the <NSObject> redundant as every object conforms to this protocol.

Sherm Pendley · Accepted Answer · 2011-03-27 17:25:31Z

3

Id is an instance of any class, not necessarily one that inherits from the NSObject class. Unlike Java's Object, NSObject isn't the "one true base class" from which every class inherits. So no, not all objects conform to the NSObject protocol, meaning the <NSObject> isn't redundant.

edited Mar 27, 2011 at 17:25

answered Mar 27, 2011 at 17:13

Sherm Pendley

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