UINavigationController + UISearchController

Question

摘要

当一个子UINavigationController将一个UISearchController嵌入到导航项的搜索控制器中时，就会显示坏的动画。

只有当我在导航项中设置UISearchController时，才会发生这种情况。

在下面的图片中有两个例子：

1. 改变位置ViewController -当点击Back (设置)按钮时有动画滞后。
2. 自定义ViewController -工作良好。

流

UITableViewController > UIViewController，在导航项中嵌入UISearchController

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发现

我研究了这种行为，并找到了一些描述类似行为的答案，但与我的设置不完全相同。

试图通过将导航项搜索控制器设置为nil来实现以下文章中建议的解决方案--没有解决此行为：

Broken UISearchBar animation embedded in NavigationItem

代码在下面。提前谢谢。

class ChangeLocationViewController: UIViewController {

    // MARK: - Outlets
    @IBOutlet weak var locationBanner: CustomView!
    @IBOutlet weak var locationNameLabel: UILabel!
    @IBOutlet weak var locationTimeLabel: UILabel!
    @IBOutlet weak var mapView: MKMapView!

    let loadingBanner = LoadingBanner()

    var resultsViewController: GMSAutocompleteResultsViewController?
    var searchController: UISearchController?
    let locationManager = LocationManager.shared

    override func viewDidLoad() {
        super.viewDidLoad()

        locationManager.locationManagerDelegate = self

        GMSPlacesClient.provideAPIKey(AppSettings.googleAPIKey)

        self.definesPresentationContext = true;


        resultsViewController = GMSAutocompleteResultsViewController()
        resultsViewController?.delegate = self

        let autoCompletedFilter = GMSAutocompleteFilter()
        autoCompletedFilter.type = .city
        resultsViewController?.autocompleteFilter = autoCompletedFilter

        searchController = UISearchController(searchResultsController: resultsViewController)
        searchController?.searchResultsUpdater = resultsViewController
        searchController?.hidesNavigationBarDuringPresentation = false
        searchController?.searchBar.placeholder = "Search a place".localized
        searchController?.delegate = self

        // Setting the search controller [when it is not set, everything works great :)]
        navigationItem.searchController = searchController
    }

    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)

        // Removing the search controller
        self.navigationItem.searchController = nil
    }
}

Answer 1

当其他视图控制器也出现时，将navigationItem.searchController设置为nil。

class ChangeLocationViewController: UIViewController {
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)

        /* searchController */
        searchController.isActive = false
        navigationItem.searchController = nil
    }
}

class SettingsTableController: UITableViewController {
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)

        /* searchController */
        navigationItem.searchController = nil
    }
}