title: IOS 8 UITableView self-sizing cells jump/shift visually when a new view controller is pushed
body: <p>Here's how I set my table:</p>
  
  <pre><code>self.tableView = [[UITableView alloc] initWithFrame:self.view.bounds];
  self.tableView.delegate = self;
  self.tableView.dataSource = self;
  self.tableView.estimatedRowHeight = 150;
  [self.view addSubview:self.tableView];
  </code></pre>
  
  <p>Within my cells, I call <code>- (CGSize)sizeThatFits:(CGSize)size</code> to programmatically return the height (which is set in <code>- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath</code>. I'm not using constraints or autolayout.</p>
  
  <p>Nothing complex and my heights are all perfectly laid out visually.</p>
  
  <p>However the problem is when I push a new view controller, the cells jump/shift visually (either up or down). It seems to be jumping based on calculating the estimated row height values - yet sizeThatFits is also called for each visible cell before shifting so I'm really confused (not sure why either needs to be called at all really, since I'm leaving the view). I've checked the contentOffset for the tableView - it's unchanged so it's not the problem.</p>