Chapter 24. Memory Management
Garbage collection is a recent feature in Objective-C and, while this is a huge step in the right direction, it's not universally available. The alternative is traditional Objective-C managed memory, wherein your code takes responsibility for destroying objects.
The principal reasons you'd choose to use managed memory instead of garbage collection are as follows:
The operating system or compiler doesn't support garbage collection (specifically, this is the case with the iPhone OS and older versions of Mac OS X).
You're working on a project that's already using managed memory.
The code must function in a managed memory environment (for example, a plug-in).
In the first case, your only choice is to embrace managed memory. ...
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