is it possible to get a callback when a UITableView reload is done?

Question

I am reloading some cells in my table view. After the reload is done, I want to scroll so that they are visible. I am aware of the scrollToRowAtIndexPath:atScrollPosition: method. But I need to call it after the reload as done, as said reload will change row heights.

Here are some related questions, but they don't quite answer my question.
UITableView , Scroll to bottom on reload?
How to Start UITableView on the Last Cell

EDIT -- My reload does not insert or delete any rows. Rather, I am reloading one or more cells to reflect updated information.

http://stackoverflow.com/questions/5112346/uitableview-scroll-to-bottom-on-reload — Sanniv, Dec 31 '12 at 05:39
http://stackoverflow.com/questions/16071503/how-to-tell-when-uitableview-has-completed-reloaddata — hariszaman, Jan 04 '16 at 16:52

score 0 · Answer 1 · answered Mar 08 '11 at 22:34

Here are some hacky ways you could do it:

1) When you call reloadData, your cellForRowAtIndexPath: delegate function will get called once for every visible cell. You could count those and then trigger an action after the function has been called enough times.

2) I bet some of the other UITableViewDelegate functions also get called in a deterministic way. Maybe you can just call your refresh function in one of those, perhaps with a small delay.

3) You could also use performSelector:withObject:afterDelay: after [tableView reloadData] and use some hard-coded delay.

score -3 · Answer 2 · answered May 16 '13 at 18:38

Not an ideal solution but I have gotten around this using a UIView animation and corresponding completion callback. I place this in a UITableView category. Works as you'd expect.

- (void)reloadDataWithCompletion:(void (^)(BOOL finished))completion {
  [UIView animateWithDuration:0.33 animations:^(){
    [self reloadData];
  }completion:completion];
}

is it possible to get a callback when a UITableView reload is done?

2 Answers2