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I’m using an NSSortDescriptor to sort NSDate objects in an ascending order. However, I need nil dates to be at the bottom of the list, whereas at the moment they come at the top.
In the end I have decided that having nil values is not a good idea and if I want what were nil value to appear at the bottom of the ascending list I should set the dates to [NSDate distantFuture] and them check for this before displaying them. It turns out this makes more semantic sense in within the applications as well.