Created
April 19, 2012 15:51
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Shared core location manager
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| #import <Foundation/Foundation.h> | |
| #import <CoreLocation/CoreLocation.h> | |
| @interface CWCLocationManager : NSObject <CLLocationManagerDelegate> { | |
| CLLocationManager *locationManager; | |
| CLLocation *currentLocation; | |
| NSDate *locationManagerStartDate; | |
| NSTimer *locationTimer; | |
| } | |
| @property (nonatomic, retain) CLLocation *currentLocation; | |
| @property (nonatomic, retain) NSDate *locationManagerStartDate; | |
| @property (nonatomic, retain) NSTimer *locationTimer; | |
| + (CWCLocationManager *)sharedInstance; | |
| - (void)start; | |
| - (void)stop; | |
| @end |
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| #import "CWCLocationManager.h" | |
| @interface CWCLocationManager() | |
| - (BOOL)isValidLocation:(CLLocation *)newLocation withOldLocation:(CLLocation *)oldLocation; | |
| @end | |
| @implementation CWCLocationManager | |
| @synthesize currentLocation; | |
| @synthesize locationManagerStartDate; | |
| @synthesize locationTimer; | |
| static CWCLocationManager *sharedManager; | |
| + (CWCLocationManager *)sharedInstance { | |
| static dispatch_once_t pred; | |
| dispatch_once(&pred, ^{ | |
| sharedManager = [[CWCLocationManager alloc] init]; | |
| }); | |
| return sharedInstance; | |
| } | |
| - (void)dealloc { | |
| [currentLocation release]; | |
| locationManager.delegate = nil; | |
| [locationManager release]; | |
| [super dealloc]; | |
| } | |
| - (id)init { | |
| self = [super init]; | |
| if (self) { | |
| currentLocation = [[CLLocation alloc] init]; | |
| locationManager = [[CLLocationManager alloc] init]; | |
| locationManager.delegate = self; | |
| locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters; | |
| locationManager.distanceFilter = 100; | |
| [self start]; | |
| locationManagerStartDate = [[NSDate date] retain]; | |
| } | |
| return self; | |
| } | |
| #pragma mark - Public Methods | |
| - (void)start { | |
| [locationManager startUpdatingLocation]; | |
| self.locationTimer = [NSTimer scheduledTimerWithTimeInterval:30.0 | |
| target:self | |
| selector:@selector(stop) | |
| userInfo:nil | |
| repeats:NO]; | |
| } | |
| - (void)stop { | |
| [locationManager stopUpdatingLocation]; | |
| [self.locationTimer invalidate]; | |
| } | |
| #pragma mark - Private Methods | |
| /** | |
| * Reference: https://gist.github.com/1653505 | |
| */ | |
| - (BOOL)isValidLocation:(CLLocation *)newLocation withOldLocation:(CLLocation *)oldLocation { | |
| // Filter out nil locations | |
| if (!newLocation) { | |
| return NO; | |
| } | |
| // Filter out points by invalid accuracy | |
| if (newLocation.horizontalAccuracy < 0) { | |
| return NO; | |
| } | |
| // Filter out points that are out of order | |
| NSTimeInterval secondsSinceLastPoint = [newLocation.timestamp timeIntervalSinceDate:oldLocation.timestamp]; | |
| if (secondsSinceLastPoint < 0) { | |
| return NO; | |
| } | |
| // Filter out points created before the manager was initialized | |
| NSTimeInterval secondsSinceManagerStarted = [newLocation.timestamp timeIntervalSinceDate:locationManagerStartDate]; | |
| if (secondsSinceManagerStarted < 0) { | |
| return NO; | |
| } | |
| // The newLocation is good to use | |
| return YES; | |
| } | |
| #pragma mark - Delegate Methods | |
| - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation { | |
| NSInteger locationAge = abs([newLocation.timestamp timeIntervalSinceDate:[NSDate date]]); | |
| /** | |
| * if the time interval returned from core location is more than two minutes we ignore it because it might be from an old session | |
| */ | |
| if (locationAge > 120 || ![self isValidLocation:newLocation withOldLocation:oldLocation]) { | |
| return; | |
| } | |
| self.currentLocation = newLocation; | |
| } | |
| - (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error { | |
| UIAlertView *alert = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"Error", nil) | |
| message:[error description] | |
| delegate:nil | |
| cancelButtonTitle:NSLocalizedString(@"OK", nil) | |
| otherButtonTitles:nil]; | |
| [alert show]; | |
| [alert release]; | |
| } | |
| @end |
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