tableView.beginUpdates is not working iOS10

Number:rdar://324324325 Date Originated:26/09/2016
Status:Open Resolved:
Product:iOS10.0 Product Version:
Classification:Critical Reproducible:100%
UITableView method begin updates on iOS10 does not animate UITableViewCell constraints. For example, if you want to animate the height of a specified cell with tableView.beginUpdates() and tableView.endUpdates() won't work. 

#pragma mark - Table view delegate
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
    return self.selectedIndexPath && self.selectedIndexPath.row == indexPath.row ? self.view.frame.size.height - self.navigationController.navigationBar.frame.size.height + 20 : UITableViewAutomaticDimension;
Inside the didSelect Method

        [UIView animateWithDuration:0.3 delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{
            [self.tableView beginUpdates];
            [self.tableView endUpdates];
        } completion:nil];
    [self.tableView beginUpdates];
    [self.tableView endUpdates];


Try -[UITableView reloadRowsAtIndexPaths:withRowAnimation:]

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