Show UISearchController when tableView swipe down

Question

I implemented the search bar in my test application via UISearchController. when I start my app, I see the search bar under the navigation controller. but how i can hide it when app is starts and show it only when I pull a table view down? and hide again when pull up a table view? I can't find any solution in google or youtube, please help.

EDIT: this is how I implement the UISearchController in viewDidLoad

//set the searchController
searchController = UISearchController(searchResultsController: nil)
searchController.searchBar.sizeToFit()
searchController.searchResultsUpdater = self
searchController.dimsBackgroundDuringPresentation = false
searchController.searchBar.placeholder = "Search your restaurant"
tableView.tableHeaderView = searchController.searchBar
definesPresentationContext = true

tableView.scrollToRowAtIndexPath(NSIndexPath(forRow: 0, inSection: 0), atScrollPosition: UITableViewScrollPosition.Top, animated: false)

Answer 1

Place the following segment in your viewDidLoad, so whats happening is your asking the UITableView to scroll and hide the SearchBar at the beginning :

tableView.scrollToRowAtIndexPath(NSIndexPath(forRow: 0, inSection: 0), atScrollPosition: UITableViewScrollPosition.Top, animated: false)

And don't forget to set the TableViewHeader to your searchController :

tableView.tableHeaderView = searchController.searchBar

Update:

Because you have an empty tableview then replace the following :

tableView.scrollToRowAtIndexPath(NSIndexPath(forRow: 0, inSection: 0), atScrollPosition: UITableViewScrollPosition.Top, animated: false)

With :

self.tableView.contentOffset = CGPointMake(0.0, 44.0)

Good luck !

Answer 2

Swift 3:

Just after viewController appeared, you can scroll tableview to section 0, row 0 without animation.

In such a way tableHeaderView with the search bar would not be visible since it is located above section 0.

You simply scroll down the usual way to make it visible.

override func viewDidAppear(_ animated: Bool) {

    self.tableView.scrollToRow(at: IndexPath(row: 0, section: 0), at: UITableViewScrollPosition.top, animated: false)

}