iOS UITableView: Custom sections using information from a JSON object, not just counting it

Question

Say I have this JSON:

[
    {"x":"01", "ID":"1"},
    {"x":"02", "ID":"2"},
    {"x":"02", "ID":"3"},
    {"x":"03", "ID":"4"},
    {"x":"03", "ID":"5"},
    {"x":"03", "ID":"6"},
    {"x":"03", "ID":"7"}
]

and I want to create a UITableView like this:

------------
Section 01
------------
ID: 1
------------
Section 02
------------
ID: 2
ID: 3
------------
Section 03
------------
ID: 4
ID: 5
ID: 6
ID: 7

How can I find out how many sections I need and how do I output the correct data in each section?

Answer 1

Ended up with this solution:

    NSMutableDictionary *result = [NSMutableDictionary dictionary];
    for(NSDictionary* dict in data) {
        NSNumber *x = [dict objectForKey:@"x"];
        NSMutableArray *resultsForX = [result objectForKey:x];

        if(!resultsForX) {
            resultsForX = [NSMutableArray array];
            [result setObject:resultsForX forKey:x];
        }

        [resultsForX addObject:dict];
    }

    NSMutableArray *newArr = [result allValues];