sort array by key

Question

I make an NSMutableArray(listId) (through a call to a sqlite database) with dictionaries(dizionario):

-(void)readItems {
    NSString * query = @"SELECT * FROM item";
    NSArray * arrayQuery = [[NSArray alloc] initWithObjects:@"id",@"title",@"note",@"icon",@"perc",@"complete",nil];
    NSArray * arrayEle = [self caricaValoriDaDBStandard:query :arrayQuery];

    for (int i = 0; i < [arrayEle count]; i++)
    {
        NSMutableDictionary *dizionario = [arrayEle objectAtIndex:i];
        [listId addObject:dizionario];
    }
}

How do I sort the array, for example, for the "id" key?

Cleaned up your code a bit. Try not to use tabs in your code pieces on SO. Replace them with 4 spaces. Cheers! — Anton
– Anton, Commented May 29, 2011 at 21:03

Anton · Accepted Answer · 2011-05-29 20:53:12Z

3

You can use the following code:

NSArray sortedArray = [listId sortedArrayUsingComparator: ^(id a, id b) {
    NSString *first = [a objectForKey:@"id"];
    NSString *second = [b objectForKey:@"id"];
    return [first compare:second];
}];

answered May 29, 2011 at 20:53

Anton

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3 Comments

Vins Over a year ago

very nice! thanks! how do I choose to let it increasing or decreasing order?

Anton Over a year ago

@Vins Hope it will work! If so, do not forget to accept the answer ;)

Vins Over a year ago

yep,still waiting for 2 minutes, there is a limit of time to do it :)

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