I have a UITableViewController embedded on a UINavigationController. This tableView is an instance of NSFetchedResultsController. I need to add a Toolbar between the Naviga
Technical Note TN2154: UIScrollView And Autolayout provides another solution:
Note that you can make a subview of the scroll view appear to float (not scroll) over the other scrolling content by creating constraints between the view and a view outside the scroll view’s subtree, such as the scroll view’s superview.
That is, even if a scroll view (such as a table view) modifies the subview's frame, the auto layout engine will reset it on the next layout pass.