CODEWITHSUNDEEP
iphoneiosuitableviewsortingnsarray
Martin Herman
Martin Herman

Reputation: 888

Crazy array sorting in tableView! sortedArrayUsingSelector help?

My tableView app loads the data into the table view. Everything works perfectly, but the array sorting is kind of messed, like you can see in the picture below. I thought about using the sortedArrayUsingSelector, to straighten things up, but I'm not sure which "sorting method" I should use. You can see, the numbers don't go like 1. 2. 3. 4. 5. etc, but weird...

How can I sort this so the cells are sorted according the numbers? Like the order would be 1. 2. 3. 4. 5. etc NOT 1. 10. 11. 12. 13. 14. 2. 3. ?

Thanks a lot in advance!!

Upvotes: 3

Views: 2036

Answers (3)

Mundi
Mundi

Reputation: 80271

And a two-liner: 

NSSortDescriptor *descriptor = [NSSortDescriptor sortDescriptorWithKey:nil ascending:YES comparator:^(id obj1, id obj2) { return [obj1 compare:obj2 options:NSNumericSearch]; }];
rowTitleArray = [rowTitleArray sortedArrayUsingDescriptors:[NSArray arrayWithObject:descriptor]];

Upvotes: 5

Mundi
Mundi

Reputation: 80271

Here is a more elegant solution: 

NSInteger intSort(id num1, id num2, void *context) {
    NSString *n1 = (NSString *) num1;
    NSString *n2 = (NSString *) num2;
    n1 = [[n1 componentsSeparatedByString:@"."] objectAtIndex:0];
    n2 = [[n2 componentsSeparatedByString:@"."] objectAtIndex:0];
    if ([n1 intValue] < [n2 intValue]) {
        return NSOrderedAscending;
    }
    else if ([n1 intValue] > [n2 intValue]) {
        return NSOrderedDescending;
    }
    return NSOrderedSame;
}

rowTitleArray = [rowTitleArray sortedArrayUsingFunction:intSort context:NULL];

Upvotes: 1

Mundi
Mundi

Reputation: 80271

Sorry for this convoluted approach, but this does work...

NSArray *rowTitleArray = [[NSArray alloc] initWithObjects:
                          @"10. Tenth", 
                          @"15. Fifteenth", 
                          @"13. Thirteenth", 
                          @"1. First", 
                          @"2. Second", 
                          @"22. TwentySecond", nil];

NSMutableArray *dictionaryArray = [NSMutableArray array];
for (NSString *original in rowTitleArray) {
    NSString *numberString = [[original componentsSeparatedByString:@"."] objectAtIndex:0];
    NSNumber *number = [NSNumber numberWithInt:[numberString intValue]];
    NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:
                          number, @"number", original, @"rowTitle", nil];
    [dictionaryArray addObject:dict];
}
NSSortDescriptor *descriptor = [NSSortDescriptor sortDescriptorWithKey:@"number" ascending:YES];
NSArray *sortedDictionaryArray = [dictionaryArray sortedArrayUsingDescriptors:
                                  [NSArray arrayWithObject:descriptor]];
NSMutableArray *sortedRowTitles = [NSMutableArray array];
for (NSDictionary *dict in sortedDictionaryArray) {
    [sortedRowTitles addObject:[dict objectForKey:@"rowTitle"]];
}
rowTitleArray = [NSArray arrayWithArray:sortedRowTitles];

NSLog(@"%@", rowTitleArray);

Output: 

    "1. First",
    "2. Second",
    "10. Tenth",
    "13. Thirteenth",
    "15. Fifteenth",
    "22. TwentySecond"

I will try to think of a more elegant solution.

Upvotes: 1

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