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?

Answer 1

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];
}];