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I'm trying to make a high score table, and suck at arrays in objective c (actually, in general objective c is challenging for me), so I can't figure out how to sort. I'm trying to do something like this (speudocode, I'm writing this in actionscript style because I'm more comfortable with it):
highscores.addObjecttoArray(score) highscores.sort(ascending) But I can't figure it out... I've seen other threads about it, but their use plist files and stuff and I don't know enough objective c to learn from them.
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We can use . sort((a,b)=>a-b) to sort an array of numbers in ascending numerical order or . sort((a,b)=>b-a) for descending order.
The sort() method allows you to sort elements of an array in place. Besides returning the sorted array, the sort() method changes the positions of the elements in the original array. By default, the sort() method sorts the array elements in ascending order with the smallest value first and largest value last.
The trick to sorting an array is a method on the array itself called "sortedArrayUsingDescriptors:". The method takes an array of NSSortDescriptor objects. These descriptors allow you to describe how your data should be sorted.
Would you like to do that the short way?
If you have a mutable array of NSNumber instances:
NSSortDescriptor *highestToLowest = [NSSortDescriptor sortDescriptorWithKey:@"self" ascending:NO]; [mutableArrayOfNumbers sortUsingDescriptors:[NSArray arrayWithObject:highestToLowest]]; Nice and easy :)
You can also perform similar sorting with descriptors on immutable arrays, but you will end up with a copy, instead of in-place sorting.
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