ios - UISearchController 触摸后看起来不对

Question

我以编程方式将UISearchController添加到UIViewController中，当加载UIViewController时一切都很好，但是当我触摸UISearchBar时在UISearchController中，它移动到底部并且看起来不对。我第一次在代码中添加 UI 元素。

    override func viewDidLoad() {
    super.viewDidLoad()
    self.definesPresentationContext = true
    searchController = ({
        let controllerSearch = UISearchController(searchResultsController: nil)
        controllerSearch.searchBar.frame = CGRectMake(0, 20, self.view.frame.size.width, 44)
        controllerSearch.delegate = self
        controllerSearch.searchBar.delegate = self
        controllerSearch.searchBar.searchBarStyle = UISearchBarStyle.Default
        controllerSearch.dimsBackgroundDuringPresentation = false
        controllerSearch.hidesNavigationBarDuringPresentation = false
        controllerSearch.searchResultsUpdater = self
        controllerSearch.searchBar.sizeToFit()
        self.view.addSubview(controllerSearch.searchBar)
        return controllerSearch
    })()
}

虽然我让控制台显示了 UISearchController 的框架，并且它显示了正确的结果(0.0、20.0、320.0、44.0)，请帮助我。我还是尝试了一下，但结果是一样的。

  let frame = CGRectMake(0, 20, self.view.frame.size.width, 44)
  controllerSearch.searchBar.frame = frame

Answer 1

我解决了我的问题。我添加了以下元素

@IBOutlet weak var navigationItemSearch: UINavigationItem!

并更改了我的UISearchController

   searchController = ({
        let controllerSearch = UISearchController(searchResultsController: nil)
        controllerSearch.delegate = self
        controllerSearch.searchBar.delegate = self
        controllerSearch.searchBar.searchBarStyle = UISearchBarStyle.Prominent
        controllerSearch.dimsBackgroundDuringPresentation = false
        controllerSearch.hidesNavigationBarDuringPresentation = false // false
        controllerSearch.searchBar.searchBarStyle = UISearchBarStyle.Default
        controllerSearch.searchResultsUpdater = self
        // placing
        controllerSearch.searchBar.sizeToFit()
        navigationItemSearch.titleView = controllerSearch.searchBar
        //
        controllerSearch.searchBar.spellCheckingType = UITextSpellCheckingType.Yes
        controllerSearch.searchBar.autocapitalizationType = UITextAutocapitalizationType.None
        controllerSearch.searchBar.keyboardType = UIKeyboardType.WebSearch
        return controllerSearch
    })()