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.
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