When UITableView is fully reloaded - ios

Question

I have a control that partially or fully changes content of tableView. After the change occurred, I set a flag tableViewContentHasChanged:
BOOL tableViewContentHasChanged = YES;
[self.tableView reloadData];
tableViewContentHasChanged = NO;
My problem appears in tableView:viewForHeaderInSection:; it is called after the table view is reloaded, so my flag is not effective inside that method.
In short: what's the right way to observe when the table has fully reloaded, so I could set the flag to NO? And, what am i possibly doing wrong?

Answer 1

I think the best way to handle this is in the data model as others mentioned but if you really need to do this, you can do the following:
According to Apple's documentation, only visible sections/cells are reloaded when you call reloadData
so you need to know when the last visible header is rendered so you set:
tableViewContentHasChanged = YES;
[self.tableView reloadData];
Then in cellForRowAtIndexPath: get the last displayed index and store it in a member variable:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
//Your cell creating code here
UITableViewCell * cell = [tableView dequeueReusableCellWithIdentifier:#"TryCell"];
//Set last displayed index here
lastLoadedSectionIndex = indexPath.section;
NSLog(#"Loaded cell at %#",indexPath);
return cell;
}
That way when viewForHeaderInSection: is called you'll know which is the last header in that reload event:
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section{
//Create or customize your view
UIView *headerView = [UIView new];
//Toggle tableViewContentHasChanged when it's the last index
if (tableViewContentHasChanged && section == lastLoadedSectionIndex) {
tableViewContentHasChanged = NO;
NSLog(#"Reload Ended");
}
return headerView;
}
Please note that this method will only work if last visible section has at least 1 row.
Hope this helps.