Copy design patterns from Cocoa.
There are a number of design patterns that are reused in Cocoa and you will often get some benefit from using them in your own code. Class clusters are a good example. They let you hide different versions of your class that are optimised for different usage behind a single apparent interface.
For more tips, and more detail about this tip, please see my new book,
Cocoa Programming Developer's Handbook,
available in print and electronic formats.
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