How to Sort NSMutableDictionary in iOS

Question

I am new to iOS development. I am creating NSMutableDictionary with Title, Count, Score. Now I want to sort my NSMutableDictionary with the base of Count in Descending order. Please help me.

    self.top3_Question_Array = [[NSMutableArray alloc] init]; 

    NSMutableDictionary *item = [[NSMutableDictionary alloc] init];
    [item setValue: [NSString stringWithFormat: itemName] forKey:@"Title"];
    [item setValue: [NSNumber numberWithInteger: itemCount] forKey:@"Count"];
    [item setValue: [NSNumber numberWithFloat: itemScore] forKey:@"Score"];


    [self.top3_Question_Array addObject: item1];

possible duplicate of [http://stackoverflow.com/questions/4558639/sort-an-nsmutabledictionary](http://stackoverflow.com/questions/4558639/sort-an-nsmutabledictionary) — PK20, Nov 27 '15 at 06:19
SHIDHIN please up vote and tick my answer if it is useful for you.Because others can get solution through your question also it can get more views. — user3182143, Nov 27 '15 at 06:57

score 1 · Accepted Answer · answered Nov 27 '15 at 06:37

I tried below coding.it works fine for me

NSMutableDictionary *item = [[NSMutableDictionary alloc] init];
[item setValue:[NSString stringWithFormat: itemName] forKey:@"Title"];
[item setValue: [NSNumber numberWithInteger: itemCount] forKey:@"Count"];
[item setValue: [NSNumber numberWithFloat: itemScore] forKey:@"Score"];

[top3_Question_Array addObject:item];


NSSortDescriptor *countDescriptor = [[NSSortDescriptor alloc] initWithKey:@"Count" ascending:NO];
NSArray *descriptors = [NSArray arrayWithObjects:countDescriptor, nil];
NSArray *sortedArrayOfDictionaries = [top3_Question_Array sortedArrayUsingDescriptors:descriptors];
NSLog(@"sorted array of dictionaries: %@", sortedArrayOfDictionaries);

Also the expected output is

  sorted array of dictionaries: (
    {
    Count = 2;
    Score = 30;
    Title = Cholate;
 }
)

score 0 · Answer 2 · answered Nov 27 '15 at 06:27

Try this code

NSArray *myArray = @[@{@"Title" : @"Hello", @"Count":@"3", @"Score":@"100"}, @{@"Title" : @"Hello", @"Count":@"2", @"Score":@"100"}, @{@"Title" : @"Hello", @"Count":@"1", @"Score":@"100"}, @{@"Title" : @"Hello", @"Count":@"4", @"Score":@"100"}];
    NSSortDescriptor *descriptor = [NSSortDescriptor sortDescriptorWithKey:@"Count"
                                                                 ascending:NO
                                                                  selector:@selector(localizedCaseInsensitiveCompare:)];
    NSArray *sorted_array = [myArray sortedArrayUsingDescriptors:@[descriptor]];
    NSLog(@"sorted_array: %@", sorted_array);

How to Sort NSMutableDictionary in iOS

2 Answers2