Question

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What is the most efficient way to sort an NSSet?

I currently have an NSMutableSet with the following a list of strings. e.g.:
{@”c”,@”d”,@”e”,@”f”,@”g”,@”a”}

Can someone please tell me how I can sort these values alphabetically? Is there a way to do this using sortedArrayUsingDescriptors: ?

Answer 1

Sure, you can use that method:

NSSortDescriptor *sort = [NSSortDescriptor sortDescriptorWithKey:@"description" ascending:YES];
NSArray *sortedArray = [mySet sortedArrayUsingDescriptors:[NSArray arrayWithObject:sort]];

This just creates a new sort descriptor that specifies the key “description” (NSString provides a -description method that returns the string). It then passes an array containing that sort descriptor as a parameter to -sortedArrayUsingDescriptors:, which you can send to any NSSet.