You can't make this accessor a simple category method on NSArray, because it needs to know the width (and categories can't add instance variables.) But it would be very easy to make your own class that had an NSArray and the width as instance variables.
And you might just want to implement this as a C array, if the height and width are hard-coded. You just have to remember to retain objects you store into the array and release them when they're removed or replaced. That way you won't run into the issue that NSArray objects can't contain empty (nil) elements...
—Jens
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