在地圖上選取目前位置並顯示相關詳細資料

import UIKit import GoogleMaps import GooglePlaces  class MapViewController: UIViewController {    var locationManager: CLLocationManager!   var currentLocation: CLLocation?   var mapView: GMSMapView!   var placesClient: GMSPlacesClient!   var preciseLocationZoomLevel: Float = 15.0   var approximateLocationZoomLevel: Float = 10.0    // An array to hold the list of likely places.   var likelyPlaces: [GMSPlace] = []    // The currently selected place.   var selectedPlace: GMSPlace?    // Update the map once the user has made their selection.   @IBAction func unwindToMain(segue: UIStoryboardSegue) {     // Clear the map.     mapView.clear()      // Add a marker to the map.     if let place = selectedPlace {       let marker = GMSMarker(position: place.coordinate)       marker.title = selectedPlace?.name       marker.snippet = selectedPlace?.formattedAddress       marker.map = mapView     }      listLikelyPlaces()   }    override func viewDidLoad() {     super.viewDidLoad()      // Initialize the location manager.     locationManager = CLLocationManager()     locationManager.desiredAccuracy = kCLLocationAccuracyBest     locationManager.requestWhenInUseAuthorization()     locationManager.distanceFilter = 50     locationManager.startUpdatingLocation()     locationManager.delegate = self      placesClient = GMSPlacesClient.shared()      // A default location to use when location permission is not granted.     let defaultLocation = CLLocation(latitude: -33.869405, longitude: 151.199)      // Create a map.     let zoomLevel = locationManager.accuracyAuthorization == .fullAccuracy ? preciseLocationZoomLevel : approximateLocationZoomLevel     let camera = GMSCameraPosition.camera(withLatitude: defaultLocation.coordinate.latitude,                                           longitude: defaultLocation.coordinate.longitude,                                           zoom: zoomLevel)     mapView = GMSMapView.map(withFrame: view.bounds, camera: camera)     mapView.settings.myLocationButton = true     mapView.autoresizingMask = [.flexibleWidth, .flexibleHeight]     mapView.isMyLocationEnabled = true      // Add the map to the view, hide it until we've got a location update.     view.addSubview(mapView)     mapView.isHidden = true      listLikelyPlaces()   }    // Populate the array with the list of likely places.   func listLikelyPlaces() {     // Clean up from previous sessions.     likelyPlaces.removeAll()      let placeFields: GMSPlaceField = [.name, .coordinate]     placesClient.findPlaceLikelihoodsFromCurrentLocation(withPlaceFields: placeFields) { (placeLikelihoods, error) in       guard error == nil else {         // TODO: Handle the error.         print("Current Place error: \(error!.localizedDescription)")         return       }        guard let placeLikelihoods = placeLikelihoods else {         print("No places found.")         return       }        // Get likely places and add to the list.       for likelihood in placeLikelihoods {         let place = likelihood.place         self.likelyPlaces.append(place)       }     }   }    // Prepare the segue.   override func prepare(for segue: UIStoryboardSegue, sender: Any?) {     if segue.identifier == "segueToSelect" {       if let nextViewController = segue.destination as? PlacesViewController {         nextViewController.likelyPlaces = likelyPlaces       }     }   } }  // Delegates to handle events for the location manager. extension MapViewController: CLLocationManagerDelegate {    // Handle incoming location events.   func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {     let location: CLLocation = locations.last!     print("Location: \(location)")      let zoomLevel = locationManager.accuracyAuthorization == .fullAccuracy ? preciseLocationZoomLevel : approximateLocationZoomLevel     let camera = GMSCameraPosition.camera(withLatitude: location.coordinate.latitude,                                           longitude: location.coordinate.longitude,                                           zoom: zoomLevel)      if mapView.isHidden {       mapView.isHidden = false       mapView.camera = camera     } else {       mapView.animate(to: camera)     }      listLikelyPlaces()   }    // Handle authorization for the location manager.   func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {     // Check accuracy authorization     let accuracy = manager.accuracyAuthorization     switch accuracy {     case .fullAccuracy:         print("Location accuracy is precise.")     case .reducedAccuracy:         print("Location accuracy is not precise.")     @unknown default:       fatalError()     }      // Handle authorization status     switch status {     case .restricted:       print("Location access was restricted.")     case .denied:       print("User denied access to location.")       // Display the map using the default location.       mapView.isHidden = false     case .notDetermined:       print("Location status not determined.")     case .authorizedAlways: fallthrough     case .authorizedWhenInUse:       print("Location status is OK.")     @unknown default:       fatalError()     }   }    // Handle location manager errors.   func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {     locationManager.stopUpdatingLocation()     print("Error: \(error)")   } }       

#import "MapViewController.h" #import "PlacesViewController.h" @import CoreLocation; @import GooglePlaces; @import GoogleMaps;  @interface MapViewController () <CLLocationManagerDelegate>  @end  @implementation MapViewController {   CLLocationManager *locationManager;   CLLocation * _Nullable currentLocation;   GMSMapView *mapView;   GMSPlacesClient *placesClient;   float preciseLocationZoomLevel;   float approximateLocationZoomLevel;    // An array to hold the list of likely places.   NSMutableArray<GMSPlace *> *likelyPlaces;    // The currently selected place.   GMSPlace * _Nullable selectedPlace; }  - (void)viewDidLoad {   [super viewDidLoad];   preciseLocationZoomLevel = 15.0;   approximateLocationZoomLevel = 15.0;    // Initialize the location manager.   locationManager = [[CLLocationManager alloc] init];   locationManager.desiredAccuracy = kCLLocationAccuracyBest;   [locationManager requestWhenInUseAuthorization];   locationManager.distanceFilter = 50;   [locationManager startUpdatingLocation];   locationManager.delegate = self;    placesClient = [GMSPlacesClient sharedClient];    // A default location to use when location permission is not granted.   CLLocationCoordinate2D defaultLocation = CLLocationCoordinate2DMake(-33.869405, 151.199);    // Create a map.   float zoomLevel = locationManager.accuracyAuthorization == CLAccuracyAuthorizationFullAccuracy ? preciseLocationZoomLevel : approximateLocationZoomLevel;   GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:defaultLocation.latitude                                                           longitude:defaultLocation.longitude                                                                zoom:zoomLevel];   mapView = [GMSMapView mapWithFrame:self.view.bounds camera:camera];   mapView.settings.myLocationButton = YES;   mapView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;   mapView.myLocationEnabled = YES;    // Add the map to the view, hide it until we've got a location update.   [self.view addSubview:mapView];   mapView.hidden = YES;    [self listLikelyPlaces]; }  // Populate the array with the list of likely places. - (void) listLikelyPlaces {   // Clean up from previous sessions.   likelyPlaces = [NSMutableArray array];    GMSPlaceField placeFields = GMSPlaceFieldName | GMSPlaceFieldCoordinate;   [placesClient findPlaceLikelihoodsFromCurrentLocationWithPlaceFields:placeFields callback:^(NSArray<GMSPlaceLikelihood *> * _Nullable likelihoods, NSError * _Nullable error) {     if (error != nil) {       // TODO: Handle the error.       NSLog(@"Current Place error: %@", error.localizedDescription);       return;     }      if (likelihoods == nil) {       NSLog(@"No places found.");       return;     }      for (GMSPlaceLikelihood *likelihood in likelihoods) {       GMSPlace *place = likelihood.place;       [likelyPlaces addObject:place];     }   }]; }  // Update the map once the user has made their selection. - (void) unwindToMain:(UIStoryboardSegue *)segue {   // Clear the map.   [mapView clear];    // Add a marker to the map.   if (selectedPlace != nil) {     GMSMarker *marker = [GMSMarker markerWithPosition:selectedPlace.coordinate];     marker.title = selectedPlace.name;     marker.snippet = selectedPlace.formattedAddress;     marker.map = mapView;   }    [self listLikelyPlaces]; }  // Prepare the segue. - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {   if ([segue.identifier isEqualToString:@"segueToSelect"]) {     if ([segue.destinationViewController isKindOfClass:[PlacesViewController class]]) {       PlacesViewController *placesViewController = (PlacesViewController *)segue.destinationViewController;       placesViewController.likelyPlaces = likelyPlaces;     }   } }  // Delegates to handle events for the location manager. #pragma mark - CLLocationManagerDelegate  // Handle incoming location events. - (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray<CLLocation *> *)locations {   CLLocation *location = locations.lastObject;   NSLog(@"Location: %@", location);    float zoomLevel = locationManager.accuracyAuthorization == CLAccuracyAuthorizationFullAccuracy ? preciseLocationZoomLevel : approximateLocationZoomLevel;   GMSCameraPosition * camera = [GMSCameraPosition cameraWithLatitude:location.coordinate.latitude                                                            longitude:location.coordinate.longitude                                                                 zoom:zoomLevel];    if (mapView.isHidden) {     mapView.hidden = NO;     mapView.camera = camera;   } else {     [mapView animateToCameraPosition:camera];   }    [self listLikelyPlaces]; }  // Handle authorization for the location manager. - (void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status {   // Check accuracy authorization   CLAccuracyAuthorization accuracy = manager.accuracyAuthorization;   switch (accuracy) {     case CLAccuracyAuthorizationFullAccuracy:       NSLog(@"Location accuracy is precise.");       break;     case CLAccuracyAuthorizationReducedAccuracy:       NSLog(@"Location accuracy is not precise.");       break;   }    // Handle authorization status   switch (status) {     case kCLAuthorizationStatusRestricted:       NSLog(@"Location access was restricted.");       break;     case kCLAuthorizationStatusDenied:       NSLog(@"User denied access to location.");       // Display the map using the default location.       mapView.hidden = NO;     case kCLAuthorizationStatusNotDetermined:       NSLog(@"Location status not determined.");     case kCLAuthorizationStatusAuthorizedAlways:     case kCLAuthorizationStatusAuthorizedWhenInUse:       NSLog(@"Location status is OK.");   } }  // Handle location manager errors. - (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {   [manager stopUpdatingLocation];   NSLog(@"Error: %@", error.localizedDescription); }  @end       

import UIKit import GooglePlaces  class PlacesViewController: UIViewController {    // ...    // Pass the selected place to the new view controller.   override func prepare(for segue: UIStoryboardSegue, sender: Any?) {     if segue.identifier == "unwindToMain" {       if let nextViewController = segue.destination as? MapViewController {         nextViewController.selectedPlace = selectedPlace       }     }   } }  // Respond when a user selects a place. extension PlacesViewController: UITableViewDelegate {   func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {     selectedPlace = likelyPlaces[indexPath.row]     performSegue(withIdentifier: "unwindToMain", sender: self)   }    // Adjust cell height to only show the first five items in the table   // (scrolling is disabled in IB).   func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {     return self.tableView.frame.size.height/5   }    // Make table rows display at proper height if there are less than 5 items.   func tableView(_ tableView: UITableView, heightForFooterInSection section: Int) -> CGFloat {     if (section == tableView.numberOfSections - 1) {       return 1     }     return 0   } }  // Populate the table with the list of most likely places. extension PlacesViewController: UITableViewDataSource {   func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {     return likelyPlaces.count   }    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {     let cell = tableView.dequeueReusableCell(withIdentifier: cellReuseIdentifier, for: indexPath)     let collectionItem = likelyPlaces[indexPath.row]      cell.textLabel?.text = collectionItem.name      return cell   } }       

#import "PlacesViewController.h"  @interface PlacesViewController () <UITableViewDataSource, UITableViewDelegate> // ...  -(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {  }  #pragma mark - UITableViewDelegate  // Respond when a user selects a place. -(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {   self.selectedPlace = [self.likelyPlaces objectAtIndex:indexPath.row];   [self performSegueWithIdentifier:@"unwindToMain" sender:self]; }  // Adjust cell height to only show the first five items in the table // (scrolling is disabled in IB). -(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {   return self.tableView.frame.size.height/5; }  // Make table rows display at proper height if there are less than 5 items. -(CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section {   if (section == tableView.numberOfSections - 1) {     return 1;   }   return 0; }  #pragma mark - UITableViewDataSource  - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {   return self.likelyPlaces.count; }  - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {   return [tableView dequeueReusableCellWithIdentifier:cellReuseIdentifier forIndexPath:indexPath]; } @end