Question

I need to sort by value instead of Key, I think….

Heres where I populate my arrarys

const char *sql = "select cid, category from Categories ORDER BY category DESC";
sqlite3_stmt *statementTMP;

int error_code = sqlite3_prepare_v2(database, sql, -1, &statementTMP, NULL);
if(error_code == SQLITE_OK) {
    while(sqlite3_step(statementTMP) == SQLITE_ROW)
    {
        int cid = sqlite3_column_int(statementTMP, 0);
        NSString *category = [[NSString alloc] initWithUTF8String:(char *)sqlite3_column_text(statementTMP, 1)];

        NSArray *arr=[[NSArray alloc]initWithObjects:category,nil];

        [arrayTmp setObject:arr forKey:[NSString stringWithFormat:@"%i",cid]];
        [self.cidList addObject:[NSString stringWithFormat:@"%i",cid]];

        [category release];
        [arr release];
    }
}
sqlite3_finalize(statementTMP);
sqlite3_close(database);

self.allCategories = arrayTmp;
[arrayTmp release];

Heres the method where the arrays are re-sorted.

- (void)resetSearch {

NSMutableDictionary *allCategoriesCopy = [self.allCategories mutableDeepCopy];
self.Categories = allCategoriesCopy;
[allCategoriesCopy release];
NSMutableArray *keyArray = [[NSMutableArray alloc] init];
[keyArray addObject:UITableViewIndexSearch];
[keyArray addObjectsFromArray:[[self.allCategories allKeys] 
                               sortedArrayUsingSelector:@selector(compare:)]];
self.keys = keyArray;
[keyArray release];
}

This is a problem i’ve had for some time, last time I looked at this I could find an altervative to sortedArrayUsingSelector compare?

EDIT

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

NSUInteger section = [indexPath section];
NSUInteger row = [indexPath row];

NSString *key = [keys objectAtIndex:section];
NSArray *nameSection = [Categories objectForKey:key];

static NSString *SectionsTableIdentifier = @"SectionsTableIdentifier";

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:
                         SectionsTableIdentifier ];
if (cell == nil) {
    cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault 
                                   reuseIdentifier: SectionsTableIdentifier ] autorelease];
}

cell.textLabel.text = [nameSection objectAtIndex:row];
return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { 

NSUInteger section = [indexPath section];
NSUInteger row = [indexPath row];

NSString *key = [keys objectAtIndex:section];
NSArray *nameSection = [Categories objectForKey:key];

NSLog(@"the selected cid is = %i",[key intValue]); 

selectButton.enabled = YES;
}

Anyone?

Answer 1

If I understood correctly then what you wish to do to get categories from database & display it on a tableView with alphabetical sorting, index on right & search bar on top. Ideally, you would like to display the Contacts application kind of a view. If that’s correct, use below code for fetching items from DB & rebuilding (or resetting) it –

const char *sql = "select cid, category from Categories ORDER BY category DESC";
sqlite3_stmt *statementTMP;

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

int error_code = sqlite3_prepare_v2(database, sql, -1, &statementTMP, NULL);
if(error_code == SQLITE_OK) {
    while(sqlite3_step(statementTMP) == SQLITE_ROW) {
         int cid = sqlite3_column_int(statementTMP, 0);
         NSString *category = [[NSString alloc] initWithUTF8String:(char *)sqlite3_column_text(statementTMP, 1)];

         NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];
         [dict setObject:category forKey:@"Category"];
         [dict setObject:[NSNumber numberWithInt:cid] forKey:@"CID"];

         [arrayTmp addObject:dict];
         [dict release];
         [category release];
    }
}

sqlite3_finalize(statementTMP);
sqlite3_close(database);

self.allCategories = arrayTmp;
[arrayTmp release];

And then rebuild the items using this function –

- (void)rebuildItems {
    NSMutableDictionary *map = [NSMutableDictionary dictionary];

    for (int i = 0; i < allCategories.count; i++) {
        NSString *name = [[allCategories objectAtIndex:i] objectForKey:@"Category"];
        NSString *letter = [name substringToIndex:1];
        letter = [letter uppercaseString];

        if (isdigit([letter characterAtIndex:0]))
              letter = @"#";

        NSMutableArray *section = [map objectForKey:letter];
        if (!section) {
            section = [NSMutableArray array];
            [map setObject:section forKey:letter];
        }
        [section addObject:[allCategories objectAtIndex:i]];
    }

    [_items release];
    _items = [[NSMutableArray alloc] init];
    [_sections release];
    _sections = [[NSMutableArray alloc] init];

    NSArray* letters = [map.allKeys sortedArrayUsingSelector:@selector(caseInsensitiveCompare:)];
    for (NSString* letter in letters) {
        NSArray* items = [map objectForKey:letter];
        [_sections addObject:letter];
        [_items addObject:items];
    }
}

Now, displaying items in tableView, use below methods –

#pragma mark -
#pragma mark Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)aTableView {
    if (_sections.count)
        return _sections.count;
    else
        return 1;
}

- (NSInteger)tableView:(UITableView*)tableView sectionForSectionIndexTitle:(NSString *)title
               atIndex:(NSInteger)index {

    if (tableView.tableHeaderView) {
        if (index == 0) {
            [tableView scrollRectToVisible:tableView.tableHeaderView.bounds animated:NO];
            return -1;
        }
    }

    NSString* letter = [title substringToIndex:1];
    NSInteger sectionCount = [tableView numberOfSections];
    for (NSInteger i = 0; i < sectionCount; i++) {
         NSString* section = [tableView.dataSource tableView:tableView titleForHeaderInSection:i];
         if ([section hasPrefix:letter]) {
             return i;
         }
    }

    if (index >= sectionCount) {
        return sectionCount-1;
    } else {
        return index;
    }
}


- (NSArray*)lettersForSectionsWithSearch:(BOOL)withSearch withCount:(BOOL)withCount {
    if (isSearching)
        return nil;

    if (_sections.count) {
        NSMutableArray* titles = [NSMutableArray array];
        if (withSearch) {
            [titles addObject:UITableViewIndexSearch];
        }
        for (NSString* label in _sections) {
            if (label.length) {
                NSString* letter = [label substringToIndex:1];
                [titles addObject:letter];
            }
        }
        if (withCount) {
            [titles addObject:@"#"];
        }
        return titles;
    } else {
        return nil;
    }
}


- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView {
    return [self lettersForSectionsWithSearch:YES withCount:NO];
}


- (NSInteger)tableView:(UITableView *)aTableView numberOfRowsInSection:(NSInteger)section {
    if (_sections.count) {
        NSArray* items = [_items objectAtIndex:section];
        return items.count;
    } else {
        return _items.count;
    }
}


- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
    if (_sections.count) 
        return [_sections objectAtIndex:section];

    return nil;
}


- (id)tableView:(UITableView *)tableView objectForRowAtIndexPath:(NSIndexPath *)indexPath {
    if (_sections.count) {
        NSArray *section = [_items objectAtIndex:indexPath.section];
        return [section objectAtIndex:indexPath.row];
    } else {
        return [_items objectAtIndex:indexPath.row];
    }
}


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    // Create your UITableViewCell.

    // Configure the cell.
    NSDictionary *dict = [self tableView:tableView objectForRowAtIndexPath:indexPath];
    cell.textLabel.text = [dict objectForKey:@"Category"];
            cell.detailTextLabel.text = [NSString stringWithFormat:%d, [[dict objectForKey:@"CID"] intValue]];
    return cell;
}

#pragma mark -
#pragma mark Table view delegate


- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section {
    if (isSearching)
        return nil;

    NSString *title = @"";
    if (_sections.count) {      
        title = [[_sections objectAtIndex:section] substringToIndex:1];
    } else {
        return nil;
    }

    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 20)];
    view.backgroundColor = [UIColor colorWithRed:(58/255.0) green:(27/255.0) blue:(6/255.0) alpha:1.0];

    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(10, 1, 50, 18)];
    label.textColor = [UIColor whiteColor];
    label.backgroundColor = [UIColor clearColor];
    label.font = [UIFont boldSystemFontOfSize:17.0];
    label.text = title;

    [view addSubview:label];
    [label release];

    return [view autorelease];
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    NSDictionary *dict = [self tableView:tableView objectForRowAtIndexPath:indexPath];

    NSLog(@"selected row id:%d, name:%@", [dict objectForKey:@"Category"], [[dict objectForKey:@"CID"] intValue]);
}

The rest part is implementing the UISearchBarDelegate and implementing searching of tableView which can be done using below code:

- (void)searchBar:(UISearchBar *)searchbar textDidChange:(NSString *)searchText {

    [_sections removeAllObjects];
    [_items removeAllObjects];

    if([searchText isEqualToString:@""] || searchText == nil) {
        [self rebuildItems];
        return;
    }

    NSInteger counter = 0;
    for(NSDictionary *dict in allCategories) {
        NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
        NSRange r = [[dict objectForKey:@"Category"] rangeOfString:searchText options:NSCaseInsensitiveSearch];
        if(r.location != NSNotFound) {
            if(r.location == 0) {
                [_items addObject:dict];
            }
        }
        counter++;
        [pool release];
    }

    [contactList reloadData];
}

Hope this is what you’re looking for.