can you set locationManager.pausesLocationUpdatesAutomatically
to YES
this should help
ios, get location every hour (ios7)
-
15-10-2022 - |
Domanda
In my project I need to get location evry hour. My code looks like this:
#import "AppDelegate.h"
@implementation AppDelegate {
UIBackgroundTaskIdentifier bgTask;
CLLocationManager *locationManager;
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.pausesLocationUpdatesAutomatically = NO;
locationManager.activityType = CLActivityTypeOther;
locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters;
locationManager.distanceFilter = kCLDistanceFilterNone;
return YES;
}
- (void)applicationDidEnterBackground:(UIApplication *)application {
__block UIBackgroundTaskIdentifier background_task;
background_task = [application beginBackgroundTaskWithExpirationHandler:^ {
[application endBackgroundTask: background_task];
background_task = UIBackgroundTaskInvalid;
}];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
[locationManager startUpdatingLocation];
while(TRUE)
{
NSLog(@"Background time Remaining: %f",[[UIApplication sharedApplication] backgroundTimeRemaining]);
[NSThread sleepForTimeInterval:200]; //wait for x sec
[locationManager startUpdatingLocation];
}
[application endBackgroundTask: background_task];
background_task = UIBackgroundTaskInvalid;
});
}
- (void) locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations {
CLLocation *location = [locations lastObject];
NSDate* eventDate = location.timestamp;
NSTimeInterval time = [eventDate timeIntervalSinceNow];
if (abs(time) < 15.0) {
if (location != nil) {
NSString *lat = [NSString stringWithFormat:@"%.8f", location.coordinate.latitude];
NSString *lng = [NSString stringWithFormat:@"%.8f", location.coordinate.longitude];
NSLog(@"location update ...");
//[APIConnection SaveMyPositionWitLat:lat withLng:lng];
//[locationManager stopUpdatingLocation];
}
}
}
This works, but battery im my phone is drained very fast and location is checking every second. If I enable:
[locationManager stopUpdatingLocation];
then location service is stoped permanently. How to change this code for saving battery power ?
Soluzione 2
Altri suggerimenti
Your idea about getting the location is not really possible in iOS since your app needs a active location monitoring to keep running in the background.
For this Apple has the methods to check only major changes, startMonitoringSignificantLocationChanges
.
This will inform you app of any major changes in location. Then what you could do to get a more accurate location is start the normal startUpdatingLocation
.
This way you save battery and only grab the location when needed.