How to sort an array containing NSDates

Question

Can you help me on sorting (ascending order) the array contains NSDate.

NSMutableArray *tempArray = [[NSMutableArray alloc]init];

[tempArray addObject: NSDate1];
[tempArray addObject: NSDate2];
[tempArray addObject: NSDate3];
[tempArray addObject: NSDate4];

You should do something like this : http://stackoverflow.com/a/8136413/1915443 — dosdos, Dec 29 '15 at 09:42
Check out these links : [link 1](http://stackoverflow.com/questions/4354753/sorting-an-nsarray-of-nsdates) [link2](http://stackoverflow.com/questions/12913377/sort-array-of-objects-by-their-nsdate-property) [link 3](http://stackoverflow.com/questions/6083408/sort-nsarray-of-custom-objects-by-their-nsdate-properties) [Google search](https://www.google.co.in/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=sort%20nsdate%20array) — nikhil84, Dec 29 '15 at 09:46
http://stackoverflow.com/questions/11374040/objective-c-sort-string-date-array — Mehul Sojitra, Dec 29 '15 at 09:46
Possible duplicate of [Sorting NSDates](http://stackoverflow.com/questions/8136367/sorting-nsdates) — Markus Kull, Dec 29 '15 at 09:57

vadian · Answer 1 · 2015-12-29T14:20:13.120

1

Since NSDate responds to compare and the default sorting order is ascending, the simplest way is

[tempArray sortUsingSelector:@selector(compare:)];

edited Dec 29 '15 at 14:20

answered Dec 29 '15 at 11:32

vadian

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score 1 · Accepted Answer · answered Feb 08 '16 at 10:22

Use below code:

  [your array sortUsingComparator:
  ^NSComparisonResult(id obj1, id obj2){

         obj1 *o1 = (obj1*)obj1;
         obj2 *o2 = (obj2*)obj2;
         if (o1.personAge > 02.personAge) {
            return (NSComparisonResult)NSOrderedDescending;
        }


        return (NSComparisonResult)NSOrderedSame;
}

];

score 0 · Answer 3 · edited Dec 29 '15 at 10:10

NSSortDescriptor *dateSortDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"self.dueDate" ascending:YES comparator:^NSComparisonResult(id obj1, id obj2) {

    NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
    [dateFormat setDateFormat:@"dd/MM/yyyy"];
    NSDate *date1 = [dateFormat dateFromString:obj1];
    NSDate *date2 = [dateFormat dateFromString:obj2];

    return [date1 compare:date2];
}];

Avinash Tag · Answer 4 · 2015-12-30T05:21:57.793

0

Best way to do this,use sort descriptor.

 NSSortDescriptor *dateSortDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"self.dueDate" ascending:YES comparator:^NSComparisonResult(NSDate *dateObject1, NSDate *dateObject2) {

return [dateObject1 compare:dateObject2];
}];

edited Dec 30 '15 at 05:21

answered Dec 29 '15 at 11:01

Avinash Tag

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That sorts actually strings (NSString) rather than dates (NSDate) – vadian Dec 29 '15 at 11:36
No @vadian we converting the date string to date and then comparing the dates. If you already have two dates then just compare it date1 compare:date2 – Avinash Tag Dec 30 '15 at 04:09
The question **is** about `NSDate` objects. – vadian Dec 30 '15 at 05:15
@vadian i edited the method please check let me know the problem if not done by this snippet of code. – Avinash Tag Dec 30 '15 at 05:23
Basically it's correct now. But the question is also about sorting an `NSMutableArray` of dates rather than dictionaries or custom objects with a key `dueDate`. – vadian Dec 30 '15 at 05:28

score 0 · Answer 5 · answered Dec 30 '15 at 05:35

0

[array1 sortUsingComparator: (NSComparator)^(NSString *key1, NSString *key2)
 {        
     return [key2 compare: key1];
 }
 ];

If you want array in ascending or descending order just change

compare

return [key1 compare: key2];

answered Dec 30 '15 at 05:35

Viraj Padsala

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How to sort an array containing NSDates

5 Answers5