Setter methods like this are sometimes explained in more detail in the getter method, in the input text in the class documentation, or in one of the documentation maintenance guides that you see in the lower left corner. Sometimes you can also find hints in Cocoa headers by right-clicking on a name while writing code and choosing "go to definition".
Otherwise, there really is no other resource besides Google asking about it on sites like this, or using the mailing list. You can always write code to check what happens when you change its value. And, of course, if this is something really confusing, itโs good to also spend time publishing a radar bug report, so I hope it will be improved in the future.
Marc charbonneau
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