用于位置更新多个视图的单身人士

我想在任何视图中按下导航栏中的定位button之后，在所有视图中更新用户位置。 我已经开始创build一个单身人士。

Location.h

#import <Foundation/Foundation.h> #import <CoreLocation/CoreLocation.h> #import <MapKit/MapKit.h> @interface Location : NSObject <CLLocationManagerDelegate> @property (nonatomic, strong) CLLocationManager* locationManager; + (Location*)sharedSingleton; @end 

Location.m

 #import "Location.h" @implementation Location { CLLocationManager *locationManager; CLGeocoder *geocoder; CLPlacemark *placemark; } @synthesize locationManager; - (id)init { self = [super init]; if(self) { self.locationManager = [CLLocationManager new]; [self.locationManager setDelegate:self]; [self.locationManager setDistanceFilter:kCLDistanceFilterNone]; [self.locationManager setHeadingFilter:kCLHeadingFilterNone]; [self.locationManager startUpdatingLocation]; self.locationManager.desiredAccuracy = kCLLocationAccuracyBest; //do any more customization to your location manager } return self; } + (Location*)sharedSingleton { static Location* sharedSingleton; if(!sharedSingleton) { @synchronized(sharedSingleton) { sharedSingleton = [Location new]; } } return sharedSingleton; } #pragma mark - CLLocationManagerDelegate - (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error { NSLog(@"didFailWithError: %@", error); UIAlertView *errorAlert = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Failed to Get Your Location" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil]; [errorAlert show]; } - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation { NSLog(@"didUpdateToLocation: %@", newLocation); CLLocation *currentLocation = newLocation; if (currentLocation != nil) { latLabel.text = [NSString stringWithFormat:@"%.8f", currentLocation.coordinate.longitude]; longLabel.text = [NSString stringWithFormat:@"%.8f", currentLocation.coordinate.latitude]; } // Stop Location Manager [locationManager stopUpdatingLocation]; // Reverse Geocoding NSLog(@"Resolving the Address"); [geocoder reverseGeocodeLocation:currentLocation completionHandler:^(NSArray *placemarks, NSError *error) { NSLog(@"Found placemarks: %@, error: %@", placemarks, error); if (error == nil && [placemarks count] > 0) { placemark = [placemarks lastObject]; addressLabel.text = [NSString stringWithFormat:@"%@, %@", placemark.locality, placemark.administrativeArea]; addressLabel.numberOfLines = 0; } else { NSLog(@"%@", error.debugDescription); } } ]; } @end 

我想在当前视图中按下顶部导航栏中的locationButton时，使用它来更新用户lat和每个视图的long。

 - (IBAction)locationPressed:(id)sender { [[Location sharedSingleton].locationManager startUpdatingLocation]; } 

NSNotifications是最好的？ 如果是的话，我将如何在Location.m和视图控制器中实现它们？ 谢谢。

Answer 1

我会做的是使用观察者模式。 在你的单例中，保留一个所有观察者的NSMutableArray 。

 NSMutableArray *observers; 

你需要一个所有观察者都遵守的协议：

 @protocol LocationObserver <NSObject> - (void)locationDidChange:(CLLocation *)updatedLocation; @end 

然后当位置改变时就做这个

 for (id<LocationObserver> observer in observers) { [observer locationDidChange:newLocation]; } 

你应该有一个addObserver和removeObserver方法，它需要一个id<LocationObserver>并将其从数组中添加/删除。

Answer 2

这是我做的，你可以find完整的例子在github上https://github.com/irfanlone/CLLocationManager-Singleton-Swift

只需在项目中导入此文件，然后您可以select实施LocationUpdateProtocol或侦听位置更新的通知

 import MapKit protocol LocationUpdateProtocol { func locationDidUpdateToLocation(location : CLLocation) } /// Notification on update of location. UserInfo contains CLLocation for key "location" let kLocationDidChangeNotification = "LocationDidChangeNotification" class UserLocationManager: NSObject, CLLocationManagerDelegate { static let SharedManager = UserLocationManager() private var locationManager = CLLocationManager() var currentLocation : CLLocation? var delegate : LocationUpdateProtocol! private override init () { super.init() self.locationManager.delegate = self self.locationManager.desiredAccuracy = kCLLocationAccuracyBest self.locationManager.distanceFilter = kCLLocationAccuracyHundredMeters locationManager.requestAlwaysAuthorization() self.locationManager.startUpdatingLocation() } // MARK: - CLLocationManagerDelegate func locationManager(manager: CLLocationManager, didUpdateToLocation newLocation: CLLocation, fromLocation oldLocation: CLLocation) { currentLocation = newLocation let userInfo : NSDictionary = ["location" : currentLocation!] dispatch_async(dispatch_get_main_queue()) { () -> Void in self.delegate.locationDidUpdateToLocation(self.currentLocation!) NSNotificationCenter.defaultCenter().postNotificationName(kLocationDidChangeNotification, object: self, userInfo: userInfo as [NSObject : AnyObject]) } } } 

用法：

 class ViewController: UIViewController, LocationUpdateProtocol { var currentLocation : CLLocation! override func viewDidLoad() { super.viewDidLoad() NSNotificationCenter.defaultCenter().addObserver(self, selector: "locationUpdateNotification:", name: kLocationDidChangeNotification, object: nil) let LocationMgr = UserLocationManager.SharedManager LocationMgr.delegate = self } // MARK: - Notifications func locationUpdateNotification(notification: NSNotification) { let userinfo = notification.userInfo self.currentLocation = userinfo!["location"] as! CLLocation print("Latitude : \(self.currentLocation.coordinate.latitude)") print("Longitude : \(self.currentLocation.coordinate.longitude)") } // MARK: - LocationUpdateProtocol func locationDidUpdateToLocation(location: CLLocation) { currentLocation = location print("Latitude : \(self.currentLocation.coordinate.latitude)") print("Longitude : \(self.currentLocation.coordinate.longitude)") } }