Question

在我正在构建的应用中，我能够成功实现地图。问题是，当我尝试使用SearchButton实现栏时，应用程序崩溃，并且输出显示：“由于未捕获的异常'NSUnknownKeyException'而终止应用程序，原因：'[setValue：forUndefinedKey：]：此类不是键值编码-符合键searchButton。” 这是MapViewController文件。

感谢您的帮助...

import UIKit
import MapKit

class MapViewController: UIViewController, UISearchBarDelegate {

    @IBOutlet weak var mapView: MKMapView!


    override func viewDidLoad() {
        super.viewDidLoad()
        mapView.userTrackingMode = .follow
        let annotations = LocationsStorage.shared.locations.map { annotationForLocation($0) }
        mapView.addAnnotations(annotations)
        NotificationCenter.default.addObserver(self, selector: #selector(newLocationAdded(_:)), name: .newLocationSaved, object: nil)
    }




    @IBAction func addItemPressed(_ sender: Any) {
        guard let currentLocation = mapView.userLocation.location else {
            return
        }
        LocationsStorage.shared.saveCLLocationToDisk(currentLocation)
    }

    func annotationForLocation(_ location: Location) -> MKAnnotation {
        let annotation = MKPointAnnotation()
        annotation.title = location.dateString
        annotation.coordinate = location.coordinates
        return annotation
    }


    @IBAction func searchButton(_ sender: Any)
    {
        let searchController = UISearchController(searchResultsController: nil)
        searchController.searchBar.delegate = self
        present(searchController, animated: true, completion: nil)
    }

    func searchBarSearchButtonClicked(_ searchBar: UISearchBar)
    {
        //Ignoring user
        UIApplication.shared.beginIgnoringInteractionEvents()

        //Activity Indicator
        let activityIndicator = UIActivityIndicatorView()
        activityIndicator.style = UIActivityIndicatorView.Style.gray
        activityIndicator.center = self.view.center
        activityIndicator.hidesWhenStopped = true
        activityIndicator.startAnimating()

        self.view.addSubview(activityIndicator)

        //Hide search bar
        searchBar.resignFirstResponder()
        dismiss(animated: true, completion: nil)

        //Create the search request
        let searchRequest = MKLocalSearch.Request()
        searchRequest.naturalLanguageQuery = searchBar.text

        let activeSearch = MKLocalSearch(request: searchRequest)

        activeSearch.start { (response, error) in

            activityIndicator.stopAnimating()
            UIApplication.shared.endIgnoringInteractionEvents()

            if response == nil
            {
                print("ERROR")
            }
            else
            {
                //Remove annotations
                let annotations = self.mapView.annotations
                self.mapView.removeAnnotations(annotations)

                //Getting data
                let latitude = response?.boundingRegion.center.latitude
                let longitude = response?.boundingRegion.center.longitude

                //Create annotation
                let annotation = MKPointAnnotation()
                annotation.title = searchBar.text
                annotation.coordinate = CLLocationCoordinate2DMake(latitude!, longitude!)
                self.mapView.addAnnotation(annotation)

                //Zooming in on annotation
                let coordinate:CLLocationCoordinate2D = CLLocationCoordinate2DMake(latitude!, longitude!)
                let span = MKCoordinateSpan(latitudeDelta: 0.1, longitudeDelta: 0.1)
                let region = MKCoordinateRegion(center: coordinate, span: span)
                self.mapView.setRegion(region, animated: true)
            }

        }
    }



    @objc func newLocationAdded(_ notification: Notification) {
        guard let location = notification.userInfo?["location"] as? Location else {
            return
        }

        let annotation = annotationForLocation(location)
        mapView.addAnnotation(annotation)
    }
}

Answer 1

您已断开输出，请检查情节提要，并检查按钮是否已链接到其相应的出口和事件。

在连接检查器中，如果它是条形按钮项，则应该可以看到按钮的插座。

如何在地图内实现SearchBar

1 个答案: