Why UITableView is not dequeuing reusable cells? - ios

Question

I'm adding subviews with UITableViewCell default type. In this, assume that, I've only 2 rows. At first, when it comes to tableView:cellForRowAtIndexPath: I'll generate a dynamic identifier for each cell based on indexPath.row. So it goes well and create a new cell inside if(cell == nil) condition. I'm adding subviews inside this condition only.
Next, out side that condition, I'm simply updating content of subview by fetching them out of the cell's contentView. This works great.
Problem is here : I'm expanding my cell (on which user tapped). When I do this, it'll go into tableView:cellForRowAtIndexPath: and I'm able to see the same identifier generated before. However, its going inside if(cell == nil) condition.
For a note, I'm checking for that condition like this,
if(!cell) and not if(cell == nil).
Can you guess what is the issue? However in my deep investigation, I found that, it'll only goes inside if(cell == nil) once I expand particular row and not next time for the same row.
Here's the sample :
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
//number of count
return [array count];
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
//dynamic height will be provided based on content.
return [self heightForRow:indexPath];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
NSString *cellIdentifier = [NSString stringWithFormat:#"cellIdentifier_%ld", (long)indexPath.row];
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if(!cell) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
[cell setSelectionStyle:UITableViewCellSelectionStyleNone];
[self setupCell:cell forRow:[indexPath row] inTable:tableView];
}
[self updateCell:cell forRow:[indexPath row] inTable:tableView];
return cell;
}
- (void) setupCell:(UITableViewCell *)cell forRow:(NSInteger)row inTable:(UITableView *)tableView {
//setting up view here
}
- (void) updateCell:(UITableViewCell *)cell forRow:(NSInteger)row inTable:(UITableView *)tableView {
//updating view here
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
self.expandedIndexPath = ([indexPath compare:self.expandedIndexPath] == NSOrderedSame) ? nil : indexPath;
[tableView beginUpdates];
[tableView reloadRowsAtIndexPaths:#[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
[tableView endUpdates];
[tableView scrollToRowAtIndexPath:self.expandedIndexPath atScrollPosition:UITableViewScrollPositionMiddle animated:YES];
}
Hope my issue is clear to you. Please comment if you don't get something or found anything missing here (and I'll update it here) or answer if you know what's the solution to this.
Thanks!