UISearchController searchbar hides the first cell in tableview

问题

I have a tableview with a search bar. The search bar is provided by a UISearchController. When I add the search bar to the header view of the table, the first row of the table gets covered by the search bar.

How do I prevent the search bar from hiding the first row?

I have this snippet in viewDidLoad:

self.searchController = UISearchController(searchResultsController: nil)
self.searchController.searchResultsUpdater = self
self.searchController.searchBar.delegate = self     
self.tableView.tableHeaderView = self.searchController.searchBar
self.searchController.dimsBackgroundDuringPresentation = false
self.searchController.searchBar.sizeToFit()

回答1:

It seems that you have to explicitly set the scope button titles array if you don't have scope button titles.

self.searchController.searchBar.scopeButtonTitles = [NSArray array];

回答2:

Found this issue to be a layout constraints issue. Resolved by dropping all of my constraints in the view containing my searchcontroller and adding back in individually until I found the offending constraint. Using Xcode 7.1

来源：https://stackoverflow.com/questions/30405321/uisearchcontroller-searchbar-hides-the-first-cell-in-tableview