Sort NSMutableArray according to object

Question

I am getting JSON like below:

"Array1": 
[
  {
    "abc": "3_name",
    "id": 34,
    "order": [3]
  },
  {
    "abc": "1_name",
    "id": 50,
    "order": [1]
  },
  {
    "abc": "2_name",
    "id": 4,
    "order": [2]
  }
]

I don't know how to sort the Array1 according to "order" which is itself an array. Please help. I could not figure out how to sort it using NSSortDescriptor or any other method available in Objective-C.

Update your question with your attempts to sort this array.

rmaddy
– rmaddy

2016-05-31 22:10:28 +00:00
Commented May 31, 2016 at 22:10 — rmaddy
– rmaddy, Commented May 31, 2016 at 22:10
@iOSDeveloper Did you get it to work using my answer?

Elwin Arens
– Elwin Arens

2016-06-06 13:53:15 +00:00
Commented Jun 6, 2016 at 13:53 — Elwin Arens
– Elwin Arens, Commented Jun 6, 2016 at 13:53

Elwin Arens · Accepted Answer · 2016-05-31 22:48:10Z

1

You'de want to sort using a comparator, which would look something like:

id customCompare = ^(NSMutableDictionary * obj1, NSMutableDictionary * obj2) {
    return [obj1[@"order"][0] compare:obj2[@"order"][0]];
};

NSArray *sortedArray = [jsonData[@"Array1"] sortedArrayUsingComparator:customCompare];

Where jsonData should be replaced by the correct name of the dict holding the Array1.

edited May 31, 2016 at 22:48

answered May 31, 2016 at 21:53

Elwin Arens

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4 Comments

rmaddy Over a year ago

You neglected to mention that this compare: method needs to exist for the objects in array1, not in the class calling sortedArrayUsingSelector:. And this doesn't take into account that you are sorting an array of dictionaries and the sort order is on a further array in those dictionaries.

Elwin Arens Over a year ago

@maddy changed to local comparator for clarity

rmaddy Over a year ago

It's still completely wrong. sortedArrayUsingSelector: doesn't take a block as an argument. And the implementation of the block doesn't reflect the data being sorted.

Elwin Arens Over a year ago

@rmaddy Ah, nice catch. Updated the example to exactly match question data.

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