Sorting Array Using NSSortDescriptor [duplicate]

Question

I have an array of class A objects, let it be detailsArray.

Class A has date, name as properties.

Can any one suggest a good method to sort this array based on date?

How can I use NSSortDescriptor to sort this array? I know sorting array of dictionary using NSSortDescriptor...

Any help is greatly appreciated.....

Check my answer here stackoverflow.com/questions/13667288/… — Anoop Vaidya
– Anoop Vaidya, Commented Mar 21, 2013 at 6:32

rptwsthi · Accepted Answer · 2015-09-16 15:05:02Z

17

NSSortDescriptor *sortDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"date" ascending:NO];
NSArray *sortedArray = [detailsArray sortedArrayUsingDescriptors:@[sortDescriptor]];

edited Sep 16, 2015 at 15:05

rptwsthi

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answered Mar 21, 2013 at 6:34

Nick C

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1 Comment

jomafer Over a year ago

Should be: sortedArrayUsingDescriptors

Anoop Vaidya · Accepted Answer · 2013-03-21 06:33:32Z

5

NSSortDescriptor *descriptor = [[NSSortDescriptor alloc] initWithKey:@"self" ascending:NO];
NSArray *descriptors = [NSArray arrayWithObject: descriptor];

NSArray *reverseOrder = [dateArray sortedArrayUsingDescriptors:descriptors];

answered Mar 21, 2013 at 6:33

Anoop Vaidya

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Comments

Inder Kumar Rathore · Accepted Answer · 2013-03-21 06:31:30Z

3

NSSortDescriptor *sortDescriptor;
sortDescriptor = [[[NSSortDescriptor alloc] initWithKey:@"date"
                                              ascending:YES] autorelease];
NSArray *sortDescriptors = [NSArray arrayWithObject:sortDescriptor];
NSArray *sortedArray;
sortedArray = [yourArray sortedArrayUsingDescriptors:sortDescriptors];

or you can use a block also

NSArray *sortedArray;
sortedArray = [yourArray sortedArrayUsingComparator:^NSComparisonResult(A *a, A *b) {
    NSDate *first = a.date;
    NSDate *second = b.date;
    return [first compare:second];
}];

answered Mar 21, 2013 at 6:31

Inder Kumar Rathore

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Comments

Hemang · Accepted Answer · 2013-03-21 06:37:32Z

1

You need to give key forward by its class name, like

NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"ClassA.date" ascending:YES];

and do google your queries before ask any question, see the google crawler result.

answered Mar 21, 2013 at 6:37

Hemang

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