iOS 13 如何在导航栏中隐藏 UISearchController searchBar

Question

我有带搜索栏的导航栏(UISearchController)
我有左栏按钮图标，单击该图标时，通过将其分配给 navigationItem 来显示此搜索 Controller ，如下所示:

if navigationItem.searchController != nil {
            navigationItem.searchController = nil
            navigationController?.view.setNeedsLayout()
            navigationController?.view.layoutIfNeeded()
        } else {
            navigationItem.searchController = searchController
            navigationController?.view.setNeedsLayout()
            navigationController?.view.layoutIfNeeded()

            searchController.searchBar.becomeFirstResponder()
        }

它可以工作，但是如果在取消按钮触摸时我尝试隐藏搜索栏，那么我将关闭 View Controller 并出现黑屏(没有 View Controller )

extension SearchableMenuViewController : UISearchBarDelegate {

    func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
        guard #available(iOS 11.0, *) else { return }
        guard !isAlwaysVisible else { return }

        if #available(iOS 13.0, *) {
            DispatchQueue.main.asyncAfter(deadline: .now() + 1.0) {
                self.navigationItem.searchController = nil
                self.navigationController?.view.setNeedsLayout()
                self.navigationController?.view.layoutIfNeeded()
            }
        } else {
            navigationItem.searchController = nil
            navigationController?.view.setNeedsLayout()
            navigationController?.view.layoutIfNeeded()
        }
    }

我试图添加延迟，因为没有从 navigationItem 中删除这个 searchcontroller 使用标题 + 搜索 Controller 将它动画到扩展导航栏，然后点击搜索图标正确隐藏搜索 Controller 。所以问题是我认为在为扩展导航栏设置动画时删除搜索 Controller

Answer 1

super 蹩脚的 haxx 将暂时解决您的问题:

func didDismissSearchController(_ searchController: UISearchController) {

        if #available(iOS 13, *) {
            navigationItem.searchController = nil

            self.navigationController?.view.setNeedsLayout()
            self.navigationController?.view.layoutSubviews()

            let view = UIView()
            self.navigationController?.navigationBar.insertSubview(view, at: 1)
            view.removeFromSuperview()
        }      
    }