UITableView beginUpdate/endUpdate causing scroll to top

Question

I've been trying to get my head around this all-too common problem of a expanding UITextView inside a growing UITableViewCell of a UITableView and I'm nearly there except for one small thing.

I have a UITableView that has a custom UITableViewCell. My UITableView is using the new iOS8 self-sizing dynamic cell height with the help of self.tableView.estimatedRowHeight and self.tableView.rowHeight = UITableViewAutomaticDimension;, that grows the cell height based on it's ContentView's auto-layout.

I can properly grow my UITextField's frame and my UITableView's cell height does indeed grow, but every time I called self.tableView beginUpdates and the matching endUpdates, my entire scroll view of the tableView forces a scroll to the top of the table view. I have a method that scrolls to the caret position, but as you can imagine, every time a new line is created in the UITextView, the UITableView scrolls to the very top and then to the caret position and it's janky as hell.

Anyone have any ideas? I can provide a video if necessary. Cheers, Mike

Answer 1

This got me as well, and it looks like self.tableView.estimatedRowHeight is the problem. When I made the estimate large enough the problem stopped happening.

I added this instead and it's working well so far:

- (CGFloat)tableView:(UITableView *)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath {     return UITableViewAutomaticDimension; }