title: UITableViewCell animate height issue in iOS 10
body: <p>My <code>UITableViewCell</code> will animate it's height when recognizing a tap. In iOS 9 and below this animation is smooth and works without issues. In iOS 10 beta there's a jarring jump during the animation. Is there a way to fix this?</p>
  
  <p>Here is a basic example of the code.</p>
  
  <pre><code>- (void)cellTapped {
      [self.tableView beginUpdates];
      [self.tableView endUpdates];
  }
  
  - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
      return self.shouldExpandCell ? 200.0f : 100.0f;
  }
  </code></pre>
  
  <p><strong>EDIT: 9/8/16</strong></p>
  
  <p>The issue still exists in the GM. After more debugging I have discovered the issue is related to the cell immediately jumping to the new height and then will animate the relevant cells offset. This means any <code>CGRect</code> based animation which is dependent on the cells bottom will not work. </p>
  
  <p>For instance if I have a view constrained to the cells bottom, it will jump. The solution would involve a constraint to the top with a dynamic constant. Or think of another way to position your views other then related to the bottom.</p>