Swift:UISearchController 不在窗口层次结构中

Question

我在 UITableViewController 上添加了一个搜索栏，但每次单击搜索栏时都会收到错误。 View 也变黑了..

警告:尝试在 FindViewController 上呈现 OWSearchController:其 View 不在窗口层次结构中!

我尝试在 viewDidLoad 和 viewDidAppear 中配置 SearchController ，结果是一样的。

class FindViewController: UITableViewController {

    var searchController: OWSearchController!

    override func viewDidAppear(animated: Bool) {
        self.configureSearchController()
    }

    func configureSearchController() {

        // Create the search controller and make it perform the results updating.
        searchController = OWSearchController(searchResultsController: self)
        searchController.hidesNavigationBarDuringPresentation = false


        // Configure the search controller's search bar.
        searchController.searchBar.searchBarStyle = .Minimal
        searchController.searchBar.placeholder = NSLocalizedString("Search", comment: "")

        // Include the search bar within the navigation bar.
        navigationItem.titleView = searchController.searchBar
        definesPresentationContext = true
    }
}

有人可以帮我解决一下这个问题吗？非常感谢

Answer 1

这是我项目中的工作代码副本

func displayContentController(content: DrawingViewController) {
    self.addChildViewController(content)
    let drawingFrame = AVMakeRectWithAspectRatioInsideRect(imageView.image!.size, imageView.bounds);
    content.view.frame = drawingFrame;
    imageView.addSubview(content.view); //image view is a self.view child, you may just use self.view?.addSubview(content.view)
    //content.drawingView.reset()
    content.didMoveToParentViewController(self);
}

func hideContentController(content: DrawingViewController) {
    content.willMoveToParentViewController(nil);
    content.view.removeFromSuperview();
    content.removeFromParentViewController();
}