问iOS 7后台定位服务停止

EN

#import "BetaLocationController.h"
#import "AppDelegate.h"
#import <Parse/Parse.h>
#import "CommunicationController.h"

@interface BetaLocationController () <CLLocationManagerDelegate>

@property UIBackgroundTaskIdentifier bgTask;
@property (strong, nonatomic) CLLocationManager *locationManager;
@property BOOL locationStarted;
@property (strong, nonatomic) CLLocation *myLocation;
@end

@implementation BetaLocationController

- (id)init
{
    self = [super init];
    if (self) {
        self.locationManager = [[CLLocationManager alloc] init];
        self.locationManager.delegate = self;
        self.locationManager.pausesLocationUpdatesAutomatically = NO;
        self.locationManager.activityType = CLActivityTypeOther;
        self.locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters;
        self.locationManager.distanceFilter = kCLDistanceFilterNone;

        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didEnterBackground:) name:UIApplicationDidEnterBackgroundNotification object:nil];
    }
    return self;
}

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
    CLLocation* location = [locations lastObject];
    self.myLocation = location;
    //    NSLog(@"Location: %f, %f", location.coordinate.longitude, location.coordinate.latitude);

}

- (void)didEnterBackground:(NSNotification *) notification
{
    [self runBackgroundTask:10];
}


-(void)runBackgroundTask: (int) time{
    //check if application is in background mode
    if ([UIApplication sharedApplication].applicationState == UIApplicationStateBackground) {

        //create UIBackgroundTaskIdentifier and create tackground task, which starts after time
        __block UIBackgroundTaskIdentifier bgTask = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{
            //            [self runBackgroundTask:5];
            [[UIApplication sharedApplication] endBackgroundTask:bgTask];
            bgTask = UIBackgroundTaskInvalid;
        }];

        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
            NSTimer *t = [NSTimer scheduledTimerWithTimeInterval:time target:self selector:@selector(startTrackingBg) userInfo:nil repeats:NO];
            [[NSRunLoop currentRunLoop] addTimer:t forMode:NSDefaultRunLoopMode];
            [[NSRunLoop currentRunLoop] run];
        });
    }
}

-(void)startTrackingBg{
    [[UIApplication sharedApplication] cancelAllLocalNotifications];
    UILocalNotification *localNotification = [[UILocalNotification alloc] init];
    NSDate *now = [NSDate date];
    localNotification.fireDate = now;

    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateFormat:@"HHmm"];
    int timeofDay = [[formatter stringFromDate:[NSDate date]] intValue];
    localNotification.applicationIconBadgeNumber = timeofDay;
    [[UIApplication sharedApplication] scheduleLocalNotification:localNotification];

    //set default time
    int time = 170;
    //if locationManager is ON
    if (self.locationStarted  == TRUE ) {
        //Here I can detect the error
        if([UIApplication sharedApplication].backgroundTimeRemaining < 10){
            [CommunicationController logToParse:[NSString stringWithFormat:@"%@ : Detected error, trying to restart locationservice", [UIDevice currentDevice].name]];
        }

        //log
        [CommunicationController logToParse:[NSString stringWithFormat:@"%@: %@ bgTime before stopUpdatingLocation: %f", [UIDevice currentDevice].name, [NSDate date], [self getBackgroundTime]]];

        [self.locationManager stopUpdatingLocation];
        self.locationStarted = FALSE;

        //log
        [CommunicationController logToParse:[NSString stringWithFormat:@"%@: %@ bgTime after stopUpdatingLocation: %f", [UIDevice currentDevice].name, [NSDate date], [self getBackgroundTime]]];

    }else{
        //start updating location

        //log
        [CommunicationController logToParse:[NSString stringWithFormat:@"%@: %@ bgTime before startUpdatingLocation: %f", [UIDevice currentDevice].name, [NSDate date], [self getBackgroundTime]]];

        [self.locationManager startUpdatingLocation];
        self.locationStarted = TRUE;

        //Time how long the application will update your location
        time = 3;

        //log
        [CommunicationController logToParse:[NSString stringWithFormat:@"%@: %@ bgTime after startUpdatingLocation: %f", [UIDevice currentDevice].name, [NSDate date], [self getBackgroundTime]]];

    }

    [self runBackgroundTask:time];
}

-(float)getBackgroundTime{
    float bgTime = [[UIApplication sharedApplication] backgroundTimeRemaining];

    //If bgtime is over 180, it returns unlimited. In iOS 7, only 3 minutes backgroundtime is available
    return bgTime > 180 ? 999 : bgTime;
}

- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
    [CommunicationController logToParse:[NSString stringWithFormat:@"%@: %@ LocationManagerDidFail %@: %f", [UIDevice currentDevice].name, [NSDate date], error, [[UIApplication sharedApplication] backgroundTimeRemaining]]];

    NSLog(@"Error in locationManager. It Failed: %@", error);
}


-(void)dealloc {
    [CommunicationController logToParse:[NSString stringWithFormat:@"%@: %@ got dealloc'ed", [UIDevice currentDevice].name, [NSDate date]]];

    NSLog(@"Dealloc in location manager is called");
}


@end