小编dam*_*sar的帖子

我遇到的问题是，当标签应该锚定到安全区域布局指南时，标签却锚定到屏幕的底部边缘。这将使标签位于 iPhone 系列之上。

这是代码...

class CustomTableViewController: UITableViewController {

   override func viewDidLoad() {
       super.viewDidLoad()

       tableView.tableFooterView = UIView(frame: .zero)
       tableView.backgroundView = CustomBackgroundView()
   } 

}

。

class CustomBackgroundView: UIView {

   override init(frame: CGRect) {
       super.init(frame: frame)
       setupSubviews()
   }

   required init?(coder aDecoder: NSCoder) {
       fatalError("init(coder:) has not been implemented")
   }

   private func setupSubviews() {
       let label = UILabel()
       label.text = "Hello, World!"
       label.textAlignment = .center
       label.translatesAutoresizingMaskIntoConstraints = false

       addSubview(label)

       label.centerXAnchor.constraint(equalTo: centerXAnchor).isActive = true
       label.bottomAnchor.constraint(equalTo: safeAreaLayoutGuide.bottomAnchor).isActive = true
   } 

}

我有一个UISearchController内心UINavigationBar.用户必须点击a UIBarButtonItem,然后我实例化一个新的UIViewController然后呈现它,以便开始搜索.

class ViewController: UIViewController {

  var searchController: UISearchController! 

  override func viewDidLoad() {
    super.viewDidLoad()
    setupSearchController()
  }

  func setupSearchController() {
    searchController = UISearchController(searchResultsController: nil)
    searchController.searchBar.delegate = self
    searchController.searchResultsUpdater = self
    searchController.searchBar.showsCancelButton = true
    searchController.dimsBackgroundDuringPresentation = false
    searchController.hidesNavigationBarDuringPresentation = false

    definesPresentationContext = true
    navigationItem.titleView = searchController.searchBar
  }

}

我事先做了大量研究,但仍无法找到解决方案......

帮助使搜索控制器成为第一个响应者将非常感激.