UITableView cannot select any two cells (n * 9) cells appart - ios

Question

I have a multi-selection UITableView created with prototype cells from a storyboard. I am able to make multiple selections,
I am finding that if I select the cell in row 0, I am unable to select any cell a multiple of 9 rows away. i.e. 9, 18, 27, etc.
If I deselect 0, I am then able to select row 9. Doing this, however, makes rows 0, 18, 27, etc unselectable.
I have implemented the following delegate method for logging, however, when clicking these unresponsive cells, this method does not get called.
-(NSIndexPath *)tableView:(UITableView *)tableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath {
if([[tableView cellForRowAtIndexPath:indexPath] isSelected]) {
NSLog(#"Already Selected");
} else {
NSLog(#"New Select");
}
return indexPath;
}
I have tested this on an iOS8.3 iPhone 6 Plus, an iOS9.2 iPhone 6S and an iOS9.2 iPhone 5S with the same results and the same distancing.
I don't believe it is a coincidence that there are 9 cells that fit on the screen at any one time. I assume it is connected with cell dequeuing and re-use but I've not been able to confirm that.
Does anyone have any direction on what it is that I am missing?
EDIT: Included tableView:cellForRowAtIndexPath
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
DKIFriendTableViewCell *cell = [self.tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier forIndexPath:indexPath];
NSArray *array;
switch ([indexPath section]) {
case 0:
array = [recommendedFilteredList objectAtIndex:[indexPath row]];
break;
case 1:
array = [fullFilteredList objectAtIndex:[indexPath row]];
break;
default:
return nil;
break;
}
BOOL selected = [selectedUsers containsObject:[array objectAtIndex:0]];
// Due to conflicts with searching table, set whether cell is selected or not.
if(selected)
[tableView selectRowAtIndexPath:indexPath animated:NO scrollPosition:UITableViewScrollPositionNone];
else
[tableView deselectRowAtIndexPath:indexPath animated:NO];
[cell setNameText:[array objectAtIndex:1]];
[cell setProfilePictureImage:[UIImage imageWithData:[[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:[array objectAtIndex:2]]options:NSDataReadingMappedIfSafe error:nil]]];
return cell;
}
It is probably worth mentioning that the problem still occurs whether the selected boolean is checked and implemented or not. Just if it is not implemented, the search results cells do not come back as highlighted.
EDIT: Included numberOfSectionsInTableView: delegate method for further information relevant to the tableView:cellForRowAtIndexPath method.
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 2;
}
EDIT: Addition of sample project BitBucket repository link
After disposing of the code I previously had and attempting to recreate the views from scratch, I still experienced the same problems. I then created only this section of the project again in a new, separate project where I still experienced the same problem (this time over a different separation - n * 12 instead of n * 9).
Sample Project BitBucket link

Answer 1

i checked a project and find the problem.
- (void) setSelected:(BOOL)selected {
[_tickImage setHidden:!selected];
}
you override a method of tableviewcell however not called the super function. after doing this, all the flow in selection/deselection is acted like you wanted.
- (void) setSelected:(BOOL)selected {
[super setSelected:selected];
[_tickImage setHidden:!selected];
}

Answer 2

Your mistake is thinking that [[tableView cellForRowAtIndexPath:indexPath] isSelected] is a valid way to see if a row is selected.
If there's no visible cell for the row at indexPath, then [tableView cellForRowAtIndexPath:indexPath] returns nil. In Objective-C, you can send any message to nil, and get back nil/false/0. So if the row at indexPath has no visible cell, your test will always return false, saying the row isn't selected.
The correct way to check whether the table view thinks a row is selected is to ask the table view which rows are selected:
if ([tableView.indexPathsForSelectedRows containsObject:indexPath]) {
// row is selected
}