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Asked: 2026-05-11T04:10:53+00:00

I’m learning objective-c, working through Aaron Hillegass’ book Cocoa Programming for Mac OS X

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I’m learning objective-c, working through Aaron Hillegass’ book ‘Cocoa Programming for Mac OS X – Third Edition’. I’m working in Xcode to develop some of the example code, and keep getting a compiler warning on the last line of this method:

- (void) setEntryDate:(NSCalendarDate *) date {     [date retain];     [entryDate release];     entryDate = date; }

The warning reads ‘warning: assignment from distinct objective-c type’. What causes this warning? How do I prevent it from happening again?

It doesn’t seem to affect execution of the program, but I don’t understand what the problem is, or even if there really is a problem (could this just be a paranoid compiler?).

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1 Answer

  1. NSCalendar and NSCalendarDate are indeed distinct types. You should decide which one you want entryDate to be (probably NSCalendarDate, judging by the ‘date’ thing’).

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