ios - Swift:SearchBar 在parentViewController 上保持可见

Question

我正在使用 searchBar ，当我选择搜索时，它工作得很好(除了我无法修复 Attempting to load the view of a view controller while it is deallocating... UISearchController 的运行时警告)

但是，如果 searchBar 处于事件状态并且我从 NavBar 按“后退”，则会显示parentView，但上一屏幕中的 searchBar 也可见。如果按下“后退”按钮，我尝试关闭搜索栏，但它仍然可见一段时间。我正在考虑

self.navigationItem.backButtonItem.enabled = false  

虽然 searchBar 处于事件状态，但我不喜欢这个解决方案

我的代码(我也有 func updateSearchResultsForSearchController):

class ViewController: UIViewController ,UISearchResultsUpdating {
var resultSearchController = UISearchController()

override func viewDidLoad() {
        super.viewDidLoad()

        if #available(iOS 9.0, *) {
            self.resultSearchController.loadViewIfNeeded()// iOS 9
        } else {
            // Fallback on earlier versions
            let _ = self.resultSearchController.view// iOS 8
        }
        self.resultSearchController = ({
            let controller = UISearchController(searchResultsController: nil)
            controller.searchResultsUpdater = self
            controller.dimsBackgroundDuringPresentation = false
            controller.searchBar.sizeToFit()
            controller.hidesNavigationBarDuringPresentation = false
            self.tableView.tableHeaderView = controller.searchBar
            return controller
        })()

运行时警告(不确定这是否是这里的问题)

Attempting to load the view of a view controller while it is deallocating is not allowed and may result in undefined behavior (<UISearchController: 0x7ff88130fdb0>)

Answer 1

要删除警告，请更改以下代码:

var resultSearchController = UISearchController()

至:

var resultSearchController : UISearchController!

并在 viewWillDisappear 方法中关闭您的 resultSearchController。