title: UIRefreshControl isn't working in iOS 10
body: <p>Adding <code>UIRefreshControl</code> in tableview as</p>
  
  <pre><code>self.refreshControl = [[UIRefreshControl alloc] init];
  [self.tableView addSubview:self.refreshControl];
  [self.refreshControl beginRefreshing];
  </code></pre>
  
  <p>This works in iOS 9.0 and prior, but it does not show in iOS 10.0.
  Anyone have idea about it?</p>