objective c - Sort the Main NSArray using the SubArray key value pair -

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I want to sort my main array based on first_name in swap self.contacts

The code that is used to sort the array 

  - (zero) Sort {NSSortDescriptor * sdName = [[NSSortDescriptor alloc] InitWithKey: @ "first_name" ascending: yes]; Self.contacts = [NSMutableArray arrayWithArray: [Contacted with your own word descriptor: [NSArray arrayWithObjects: sdName, zero]]]; }   
  MyData   
  self.contacts = ({contact = {"first_name" = "test r";}; "Last_met" = ({"last_met_date" = "2014-10-09";});}, {contact = {"first_name" = "test of";}; "last_met" = ({"last_met_date" = "2014 -10-09 ";}};})   
 
 
 Try with this sort descriptor Do:  
  Descriptor = [[NSSSort Descriptor Alok] initWithKey: @ "contact.first_name" ascending: Yes];   
 parameter  key  is actually a  key path , and  nsDictionary  is compliant as you like stuff You can write:  [Contact [0] valueForKeyPath: @ "contact.first_name"] .

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