Strange white space at UITableView header when using UISearchController with UITableViewController on iOS 10

Question

The white space only appears on iOS 10.

Answer 1

I ran into this problem as well. If you have the vertical scroll indicator enabled, you should be able to see that it's a UIScrollView's inset issue. And seems like it only happens when you use a UITableViewcontroller as the searchResultsController of a UISearchController.

And this extra space is visible at both the top and bottom of the view.

This answer is not pretty, but I'm adding this in for now.

if #available(iOS 10.0, *) {
    automaticallyAdjustsScrollViewInsets = false
    tableView.contentInset = UIEdgeInsetsMake(64, 0, 44, 0)
}

Answer 2

You're setting a UITableViewController as the UISearchController's searchResultsController but without Autolayout nor a frame.

As you can read in the UISearchController's Quick Help, you can pass it nil if you want to display the search results in the same view controller that displays your searchable content.

So you're code will look okay if you set it like this:

class ViewController: UIViewController {

let searchController = UISearchController(searchResultsController: nil)

override func viewDidLoad() {
        super.viewDidLoad()

        let tableView = UITableView(frame: view.bounds, style: .plain)
        tableView.dataSource = self

        view.addSubview(tableView)

        searchController.hidesNavigationBarDuringPresentation = false
        searchController.dimsBackgroundDuringPresentation = false
        navigationItem.titleView = searchController.searchBar
        searchController.searchBar.becomeFirstResponder()
        searchController.searchBar.text = "⬇️ What is this white space? ⬇️"
    }
}
...