Question

我遇到了一些通过show segue转换到新的viewcontroller的问题。我已经能够使用当前的segue，但想要使用推/显示导航堆栈。我收到此错误...“正在发生现有转换或演示;导航堆栈将不会更新。”感谢您提前提供任何帮助！

//从homecontroller中搜索到searchVC

    func handleSearch() {
        let vc = SearchVC()
        show(vc, sender: self)

    }

//在searchVC类中设置搜索栏

    func loadPlacesSearchBar() {

        searchController?.searchBar.isHidden = false

        resultsViewController = GMSAutocompleteResultsViewController()
        resultsViewController?.delegate = self

        searchController = UISearchController(searchResultsController: resultsViewController)
        searchController?.searchResultsUpdater = resultsViewController

        // Put the search bar in the navigation bar.
        searchController?.searchBar.sizeToFit()

        navigationItem.titleView = searchController?.searchBar
        searchController?.searchBar.placeholder = "search places"

        // When UISearchController presents the results view, present it in
        // this view controller, not one further up the chain.
        definesPresentationContext = true

        // Prevent the navigation bar from being hidden when searching.
        searchController?.hidesNavigationBarDuringPresentation = false

    }

//来自SearchVC的扩展程序

extension SearchVC: GMSAutocompleteResultsViewControllerDelegate {

    func resultsController(_ resultsController: GMSAutocompleteResultsViewController,
                           didAutocompleteWith place: GMSPlace) {

        searchController?.isActive = false

        // Do something with the selected place.

        let autocompleteController = GMSAutocompleteViewController()
        autocompleteController.delegate = self as? GMSAutocompleteViewControllerDelegate

        print("Place name: \(place.name)")
        print("Place address: \(String(describing: place.formattedAddress))")
        print("Place attributions: \(String(describing: place.attributions))")

        self.dismiss(animated: true, completion: nil)

        let mapView = MapViewController()
        show(mapView, sender: self)

//        let mapView = MapViewController()
//        let navController = UINavigationController(rootViewController: mapView)
//        present(navController, animated: true, completion: nil)

        DispatchQueue.main.async {
            self.dismiss(animated: true, completion: nil)
        }

    }

    func resultsController(_ resultsController: GMSAutocompleteResultsViewController,
                           didFailAutocompleteWithError error: Error){
        // TODO: handle the error.
        print("Error: ", error.localizedDescription)
    }

    // Turn the network activity indicator on and off again.
    func didRequestAutocompletePredictions(_ viewController: GMSAutocompleteViewController) {
        UIApplication.shared.isNetworkActivityIndicatorVisible = true
    }

    func didUpdateAutocompletePredictions(_ viewController: GMSAutocompleteViewController) {
        UIApplication.shared.isNetworkActivityIndicatorVisible = false
    }
}

Answer 1

您遇到此问题的原因是，当您进行选择时，searchController将被解除，因此，当您尝试推送新的视图控制器时，将处于动画的中间位置。

一个非常简单的解决方案适用于我将视图控制器设置为UISearchControllerDelegate，然后在searchController被解除后调用您的视图。

    searchController = UISearchController(searchResultsController: resultsViewController)
    searchController?.searchResultsUpdater = resultsViewController
    searchController?.delegate = self //<- add this

然后遵守代表并实施此

extension YourViewController:UISearchControllerDelegate {

func didDismissSearchController(_ searchController: UISearchController) {
   // perform your segue, or push/present your view controller here
}

从GMSAutocompleteResultsViewController中选择地点时显示segue（以编程方式）

1 个答案: