How can I sort strings in NSMutableArray into alphabetical order? How can I sort strings in NSMutableArray into alphabetical order? ios ios

How can I sort strings in NSMutableArray into alphabetical order?


There is the following Apple's working example, using sortedArrayUsingSelector: and localizedCaseInsensitiveCompare: in the Collections Documentation:

sortedArray = [anArray sortedArrayUsingSelector:                       @selector(localizedCaseInsensitiveCompare:)];

Note that this will return a new sorted array. If you want to sort your NSMutableArray in place, then use sortUsingSelector: instead, like so:

[mutableArray sortUsingSelector:@selector(localizedCaseInsensitiveCompare:)];


Here's an updated answer for Swift:

  • Sorting can be done in Swift with the help of closures. There are two methods - sort and sorted which facilitate this.

    var unsortedArray = [ "H", "ello", "Wo", "rl", "d"]var sortedArray = unsortedArray.sorted { $0.localizedCaseInsensitiveCompare($1) == NSComparisonResult.OrderedAscending }

    Note: Here sorted will return a sorted array. The unsortedArray itself will not be sorted.

  • If you want to sort unsortedArray itself, use this

    unsortedArray.sort { $0.localizedCaseInsensitiveCompare($1) == NSComparisonResult.OrderedAscending }


Reference :

  • Here is the documentation for Swift's sorting methods.

  • Docs for different String comparison methods here.


Optional:

Instead of using localizedCaseInsensitiveCompare, this could also be done:

stringArray.sort{ $0.lowercaseString < $1.lowercaseString }

or even

stringArray.sort{ $0 < $1 }

if you want a case sensitive comparison


It's easy to get the ascending order. Follow the bellow steps,,,

Model 1 :

NSSortDescriptor *sortDesc = [NSSortDescriptor sortDescriptorWithKey:@"name" ascending:YES];sortedArray=[yourArray sortedArrayUsingDescriptors:@[sortDesc]];

If you want the sorting to be case insensitive, you would need to set the descriptor like this,,
Model 2 :

NSSortDescriptor * sortDesc = [NSSortDescriptor sortDescriptorWithKey:@"name" ascending:YES selector:@selector(caseInsensitiveCompare:)]; sortedArray=[yourArray sortedArrayUsingDescriptors:@[sortDesc]];