sorting an NSArray of NSDates

Question

I have an NSArray of NSDate objects and I want to sort them so that today is at 0, yesterday at 1 etc.

Is it ascending or descending, and do i use a function, select

Answer 1

Try this magic:

Sort array of dates in ascending order.

i.e. dates getting later and later, or to put it another way, dates going into the future.

NSArray ascendingDates = [dates sortedArrayUsingSelector:@selector(compare:)];

Sort array of dates in descending order. (what the question asked)

i.e. dates getting earlier and earlier, dates going into the past or to put it another way: today is at index 0, yesterday at index 1.

NSArray* descendingDates = [[[dates sortedArrayUsingSelector:@selector(compare:)] reverseObjectEnumerator] allObjects];