Question

I have 30 rows in uitable view and I am attempting to select multiple rows and set them to checked.

Whenever I select one row, automatically another row is selected and checked with the desired row.

Also when I scroll the tableview it changes selection automatically.

I had used this code with less number of rows (8) and it worked perfectly. For more than 12 rows it gives the problem I have described.

If you can suggest any other code/tutorial to make it work is also okay.

I am new to xcode, any help is much appreciated. Thank you.

Here is my code:

#pragma mark -
#pragma mark Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
// Return the number of sections.
return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
// Return the number of rows in the section.
return [listOfItems count];
}

// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

static NSString *CellIdentifier = @"Cell";

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

// Configure the cell...
NSString *cellValue = [listOfItems objectAtIndex:indexPath.row];
cell.text = cellValue;

return cell;
}

#pragma mark -
#pragma mark Table view delegate

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

UITableViewCell *selectedCell = [tableView cellForRowAtIndexPath:indexPath];

if ([selectedCell accessoryType] == UITableViewCellAccessoryNone) {

    if(count < 3)
    {

        [selectedCell setAccessoryType:UITableViewCellAccessoryCheckmark];
        [selectedIndexes addObject:[NSNumber numberWithInt:indexPath.row]];
        count++;
    }

    NSLog(@"Count: %d", count);
    NSLog(@"Items I selected @ %d:", indexPath.row);
    NSLog(@"Items I selected: %@", selectedIndexes);
} 

else {

    [selectedCell setAccessoryType:UITableViewCellAccessoryNone];
    [selectedIndexes removeObject:[NSNumber numberWithInt:indexPath.row]];
    count --;
    NSLog(@"Items I de-selected @ %d:", indexPath.row);

}

[tableView deselectRowAtIndexPath:indexPath animated:NO];

NSMutableString *resultlearning = [[NSMutableString alloc]init];
for (int i = 0; i < [listOfItems count]; i++) {
    NSIndexPath *path = [NSIndexPath indexPathForRow:i inSection:0];
    //[tableView scrollToRowAtIndexPath:path atScrollPosition:UITableViewScrollPositionMiddle animated:NO];
    UITableViewCell *cell = [tableView cellForRowAtIndexPath:path];
    if (cell.accessoryType == UITableViewCellAccessoryCheckmark) {
        [resultlearning appendFormat:@"%@, ",cell.textLabel.text];
    }
}
if (resultlearning.length > 2) {
    [resultlearning replaceCharactersInRange:NSMakeRange(resultlearning.length-1, 1) withString:@""];
}
NSLog(@"Result: %@",resultlearning);
}

Answer 1

Add one mutablearray in .h file.Here add as many object to array as your tableDataSourc array has. Now my intension is that if it contains 0 then that cell is not selected or it contains 1 then that cell is selected

Now do this as u have selectedIndexes array so need of another mutablearray :

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
for(int i = 0;i<[listOfItems count];i++)
{
[selectedIndexes addObject:@"0"];
}
   return [listOfItems count]
 }


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

 UITableViewCell *selectedCell = [tableView cellForRowAtIndexPath:indexPath];

 if ([selectedCell accessoryType] == UITableViewCellAccessoryNone) {

     [selectedCell setAccessoryType:UITableViewCellAccessoryCheckmark];
     [selectedIndexes replaceObjectAtIndex:indexPath.row withObject:@"1"];
}
else
{          
selectedCell.accessoryType = UITableViewCellAccessoryNone;
[selectedIndexes replaceObjectAtIndex:indexPath.row withObject:@"0"];
}

Now selectedIndexes has object with 1 value means that value is selected in listOfItems