Re: Sorting NSArray -- advice on how to accomplish a "simple" alpha ordering?
Re: Sorting NSArray -- advice on how to accomplish a "simple" alpha ordering?
- Subject: Re: Sorting NSArray -- advice on how to accomplish a "simple" alpha ordering?
- From: Graham Cox <email@hidden>
- Date: Wed, 01 Aug 2012 15:27:30 +1000
- Authentication-results: symauth.service.identifier
On 01/08/2012, at 3:20 PM, Erik Stainsby wrote:
> This has me thinking that to get the alpha sorted list of keys from a dictionary I should be passing the keypath as the param for sortDescriptorWithKey: and not trying to externalize the keys into an array first … ?
If you want to iterate over the contents of a dictionary in alphabetical order of keys, I don't think there is a magic keypath that will allow you to operate on the dictionary itself.
Your first thought was right:
NSMutableArray * sortedKeys =[ [dictionary allKeys] mutableCopy];
[sortedKeys sortUsingDescriptors:<descriptors>]; //<--- create descriptor using key @"self" or else using an alternative means of sorting
// now you can iterate over the dictionary in alphabetical order.
I would only use sort descriptors if a) I had to sort based on more than one criterion, e.g. lastName, firstName or b) I was using a table view that manages sorting using descriptors. For simple sorts there are easier ways to do it.
--Graham
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