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What are Objective-C categories?

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Hi everybody,

I got a couple of e-mails asking what Objective-C categories are, as a couple of developers ran into them when looking up stuff using the jump to definition, research assistant and help in Xcode.

I didn’t explain them in my first Objective-C tutorial as they are not too identical to something that already exists in C/C++ or Java, and they are not neccessary to use in your code.

However they are frequently used by Apple so you will run into them in your code, so in this video I explain the details, and talk about why you might want to use Categories in your code.

Please post any other questions you may have below.


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