Sorting JSON Response before show in table view controller - Objective C

Question

Rewards =     (
                {
            "Restaurant_ID" = 34;
            "Rewarded_Points" = 40;
            "Rewarded_Time" = "2015-11-23 09:16:00";
        },

           {
            "Restaurant_ID" = 40;
            "Rewarded_Points" = 60;
            "Rewarded_Time" = "2015-11-24 12:22:56";
          },
            {
            "Restaurant_ID" = 34;
            "Rewarded_Points" = 40;
            "Rewarded_Time" = "2015-11-24 12:22:56";
        }
);

im retrieving above response to variable and show in TableViewController using for loop

for(int i=0;i<rewards.count;i++){
        NSDictionary * rewardsObj = [rewards objectAtIndex:i];
        restId = [rewardsObj objectForKey:@"Restaurant_ID"];
        rewardedPoints = [rewardsObj objectForKey:@"Rewarded_Points"];
}
[self.tableView reloadData];

Current Output is showing same Restaurant ID again and again. i want if there is matching ID then those points need to be calculate sum.

34 - Total Points : 40

40 - Total Points : 60

34 - Total Points : 40 //Again

but i want to sort it like below

34 - Total Points : 80 // 40+40

40 - Total Points : 60

@Venkat yes. if there is matching restId then rewarded points output sum of all of it. — Im Batman
– Im Batman, Commented Nov 24, 2015 at 7:23
u can create a dictionary with the key is the ID, then when parsing JSON to the dictionary, u can check if the key exist then do your SUM, else then make new pair, its the easiest and fastest way i can think of — Tj3n
– Tj3n, Commented Nov 24, 2015 at 8:36

Anbu.Karthik · Accepted Answer · 2015-11-24 07:24:11Z

2

use NSSortDescriptor for your concept,

Step -1

initially select the key based on sort , for ex Rewarded_Points we take , and sort as ascending order.

NSSortDescriptor * Rewarded_Points =
[[NSSortDescriptor alloc] initWithKey:@"Rewarded_Points"
                           ascending:YES];
NSArray *descriptors = [NSArray arrayWithObjects:Rewarded_Points, nil];

 NSArray *sortedArrayOfDictionaries = [Rewards sortedArrayUsingDescriptors:descriptors]; // Rewards -> array of dictionary name

NSLog(@"final Value : %@", sortedArrayOfDictionaries);

for additional Tutorial

answered Nov 24, 2015 at 7:24

Anbu.Karthik

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1 Comment

Anbu.Karthik Over a year ago

I submitted the partial answer, for your second query i have one doubt in here your date is differnet it is fine to add, else you try for omit the duplicate value based on keys...

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