Open Radar

 
Summary:
Situation: 
- A childViewController in a custom container view controller. The childViewController's view is inset a bit and does not fully fill the container.
- The childViewController is a UITableViewController with a searchBar as tableHeaderView

Effect: The searchBar is displayed correctly when not active. But it moves to a wrong position (to the right) immediately after tapping into the search text field. It seems like the superfluous x inset of the active searchBar equals the inset of the childViewController itself.

See the attached sample project.

Steps to Reproduce:
1. In Xcode, create new Swift-based Project of the type "Single View Application"
2. Change the auto-generated ViewController.swift to the code below
3. Run in iPad Simulator to see the effect best
4. Tap into searchbar

class ViewController: UIViewController {
    let searchController = UISearchController(searchResultsController: nil)

    override func viewDidLoad() {
        super.viewDidLoad()
    
        let childViewController = UITableViewController(style: .grouped)
        childViewController.tableView.tableHeaderView = searchController.searchBar
        childViewController.definesPresentationContext = true
        childViewController.view.frame = self.view.frame.insetBy(dx: 100, dy: 100)

        self .addChildViewController(childViewController)
        self.view.addSubview(childViewController.view)
        childViewController.didMove(toParentViewController: self)
    }
}


Expected Results:
SearchBar control as a whole should stay in place (I am aware that parts - the textfield and cancel button - have to move around a bit)

Actual Results:
SearchBar control as a whole moves 100 points (= the childViewController's inset) to the right.

Version:
Happens with Xcode 7 and Xcode 8 beta, deployment target iOS 9.3 or iOS 10

Notes:


Configuration:
iPad Air 2 Simulator