One Quickie

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Sorting with Selectors (NSObject->General)

You can sort mutable arrays by providing a selector that is invoked on each of the elements of the array. I always get confused about NSOrderedAscending / NSOrderedDescending (I think they're actually backwards, but that's just me). Here it is in a nutcase: Given this sort command:

    [themStitches sortUsingSelector: @selector(compareByRowLocation:)];

And this selector on the BWCrossStitch class:

  - (NSComparisonResult) compareByRowLocation: (BWCrossStitch *) thing2;

Figure out which is lesser or greater, and return one of these. Note that self is the object's logical value, not the actual value of the self pointer.

• NSOrderedAsending if self < thing2
• NSOrderedDescending if self > thing2
• NSOrderedSame if self == thing2