如何设置操作来搜索的取消按钮

Question

我有我的mapView搜索功能，所以你可以搜索注释。 我想添加一个选项，当我按下取消按钮时，用户位置的trackingMode将为真 ，因此地图将再次以用户位置为中心。如何做呢？ 这里是我的搜索代码：

override func viewDidLoad() { 
     super.viewDidLoad() 

     //==========RegionLocation : ========= 

     // Init the zoom level 
     let coordinate:CLLocationCoordinate2D = CLLocationCoordinate2D(latitude: 31.30, longitude: 34.45) 
     let span = MKCoordinateSpanMake(125, 125) 
     let region = MKCoordinateRegionMake(coordinate, span) 
     self.mapView.setRegion(region, animated: true) 


     //====================================\\ 



     //==============Tel Aviv============== 
     self.mapView.delegate = self 
     self.locationManager.delegate = self 
     self.locationManager.desiredAccuracy = kCLLocationAccuracyBest 
     self.locationManager.requestWhenInUseAuthorization() 
     self.locationManager.startUpdatingLocation() 
     self.mapView.showsUserLocation = true 


     // Drop a pin 
     let LitzmanLocation = CLLocationCoordinate2DMake(32.100668,34.775192) 
     let Litzman = MKPointAnnotation() 
     Litzman.coordinate = LitzmanLocation 
     Litzman.title = "Litzman Bar" 
     Litzman.subtitle = "נמל תל אביב 18,תל אביב" 
     mapView.addAnnotation(Litzman) 
let searchTable = storyboard!.instantiateViewController(withIdentifier: "SearchTableViewController") as! SearchTableViewController 

     searchController = UISearchController(searchResultsController: searchTable) 
     searchController?.searchResultsUpdater = searchTable 
     searchController?.hidesNavigationBarDuringPresentation = false 
     searchController?.dimsBackgroundDuringPresentation = true 

      definesPresentationContext = true 

      let searchBar = searchController!.searchBar 
      searchBar.sizeToFit() 
      searchBar.placeholder = "חפש ברים" 
      navigationItem.titleView = searchController?.searchBar 
      searchBar.delegate = self 

      searchTable.mapView = mapView 
      searchTable.handleMapSearchDelegate = self 
    } 
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) 


    { 
     let location = locations.last 

     let center = CLLocationCoordinate2D(latitude: location!.coordinate.latitude, longitude: location!.coordinate.longitude) 

     let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 0.06, longitudeDelta: 0.06)) 

     self.mapView.setRegion(region, animated: true) 

     self.locationManager.stopUpdatingLocation() 
    } 

    func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) 
    { 
     print("Errors: " + error.localizedDescription) 
    } 

    func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? { 
     if annotation is MKUserLocation { 
      return nil 
     } 
     let reuseID = "pin" 

     var pinView = mapView.dequeueReusableAnnotationView(withIdentifier: reuseID) as? MKPinAnnotationView 
     if(pinView == nil) { 
      pinView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: reuseID) 
      pinView!.canShowCallout = true 
      pinView!.animatesDrop = false 
      pinView!.image = UIImage (named: "") 
      pinView!.rightCalloutAccessoryView = UIButton(type: UIButtonType.detailDisclosure) as UIButton 
      let smallSquare = CGSize(width: 40, height: 40) 
      let button = UIButton(frame: CGRect(origin: CGPoint.zero, size: smallSquare)) 
      button.setBackgroundImage(UIImage(named: "Car2"), for: UIControlState()) 
      pinView?.leftCalloutAccessoryView = button 

     } 
     else 
     { 
      pinView?.annotation = annotation 
     } 

     return pinView 

    } 


    func openMapsAppWithDirections(to coordinate: CLLocationCoordinate2D, destinationName name: String) { 
     let options = [MKLaunchOptionsDirectionsModeKey: MKLaunchOptionsDirectionsModeDriving] 
     let placemark = MKPlacemark(coordinate: coordinate, addressDictionary: nil) 
     let mapItem = MKMapItem(placemark: placemark) 
     mapItem.name = name // Provide the name of the destination in the To: field 
     mapItem.openInMaps(launchOptions: options) 


     func openMapsAppWithDirections(_ latitude: Double, longitude: Double) { 
      if UIApplication.shared.canOpenURL(URL(string: "waze://")!) { 
       //Waze is installed. Launch Waze and start navigation 
       let urlStr = "waze://?ll=\(latitude),\(longitude)&navigate=yes" 
       UIApplication.shared.openURL(URL(string: urlStr)!) 
      } 
      else { 
       //Waze is not installed. Launch AppStore to install Waze app 
       UIApplication.shared.openURL(URL(string: "http://itunes.apple.com/us/app/id323229106")!) 
      } 
     } 



    } 

    func mapView(_ MapView: MKMapView, annotationView: MKAnnotationView, calloutAccessoryControlTapped controll: UIControl) { 
     if controll == annotationView.rightCalloutAccessoryView { 
      let segueID: String = "BarsProfile" // Use the appropriate segue ID here 
      performSegue(withIdentifier: segueID, sender: self)} 

      if controll == annotationView.leftCalloutAccessoryView { 
       if let annotation = annotationView.annotation { 
        // Unwrap the double-optional annotation.title property or 
        // name the destination "Unknown" if the annotation has no title 
        let destinationName = (annotation.title ?? nil) ?? "Unknown" 
        openMapsAppWithDirections(to: annotation.coordinate, destinationName: destinationName) 


         } 
        } 
      } 
    func updateMap(_ location: CLLocation) { 
     let region = MKCoordinateRegionMakeWithDistance(location.coordinate, 150, 150) 
     mapView.setRegion(region, animated: true) 
    } 

    func searchBarCancelButtonClicked(_ searchBar: UISearchBar) { 
     print("Cancel!") 
     updateMap(CLLocation(latitude: currentLoc.coordinate.latitude, longitude: currentLoc.coordinate.longitude)) 
    } 

} 



extension MapViewController: HandleMapSearch { 
    func dropPinZoomIn(placemark: MKAnnotation) { 
     updateMap(CLLocation(latitude: placemark.coordinate.latitude, longitude: placemark.coordinate.longitude)) 
     searchController.searchBar.text = placemark.title! 
    } 

感谢帮助 希望有人能解决了我的问题

Answer 1

假设你指的是搜索栏的取消按钮，您需要实现在该searchBarCancelButtonClicked委托方法主viewController。根据我发布到GitHub的代码，将此方法添加到ViewController.swift。

func searchBarCancelButtonClicked(_ searchBar: UISearchBar) { 
    updateMap(CLLocation(latitude: currentLoc.coordinate.latitude, longitude: currentLoc.coordinate.longitude)) 
} 

此外，声明currentLocation viewDidLoad中

var currentLoc:MKPointAnnotation!