Where to store app location data? - ios

Question

I have an app that needs to retrieve the longitude/latitude coordinates of the device when it's opened, and then communicate with the server using these coordinates. My app is based on a UITabBarController so has different pages, some of which need to use this location data. I also need to implement pull to refresh on some of these pages.
What I need to know is: Where should I store the location coordinates and where should I implement the CLLocationManager? Should I have a location manager inside each class that needs location, or should it be in the app delegate?
Thanks

Answer 1

Just create a singleton location manager class (say, MyLocationManager). Your .h file can look like this:
#interface MyLocationManager : NSObject <CLLocationManagerDelegate>
#property (strong, nonatomic) CLLocation *currentLocation;
+ (id)sharedInstance;
- (void)updateCurrentLocation;
#end
Then in the .m file implement the methods:
#import "MyLocationManager.h"
#interface MyLocationManager ()
#property (strong, nonatomic) CLLocationManager *locationManager;
#end
#implementation MyLocationManager
#pragma mark - Singleton methods
+ (id)sharedInstance {
static dispatch_once_t token;
static id shared = nil;
dispatch_once(&token, ^{
shared = [[super alloc] initUniqueInstance];
});
return shared;
}
- (id)initUniqueInstance {
self = [super init];
if (self) {
self.locationManager = [[CLLocationManager alloc] init];
[self.locationManager setDesiredAccuracy:kCLLocationAccuracyKilometer];
self.locationManager.delegate = self;
}
return self;
}
#pragma mark - Public methods
- (void)updateCurrentLocation {
[self.locationManager startUpdatingLocation];
}
#end
Implement the delegate methods and update the currentLocation property when you get the updated value. I'd also advice to check for geolocation permissions somewhere and react appropriately. And keep in mind that you should use notifications (NSNotificationCenter) to inform other objects about updates to singleton's properties, not delegation (generally, you shouldn't tie your singleton to any object). Good luck!