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#import "MGLLocationManager.h"
#import "MGLTelemetryConfig.h"
#import <UIKit/UIKit.h>
static const NSTimeInterval MGLLocationManagerHibernationTimeout = 300.0;
static const NSTimeInterval MGLLocationManagerHibernationPollInterval = 5.0;
static const CLLocationDistance MGLLocationManagerDistanceFilter = 5.0;
static NSString * const MGLLocationManagerRegionIdentifier = @"MGLLocationManagerRegionIdentifier.fence.center";
@interface MGLLocationManager ()
@property (nonatomic) CLLocationManager *standardLocationManager;
@property (nonatomic) BOOL hostAppHasBackgroundCapability;
@property (nonatomic, getter=isUpdatingLocation) BOOL updatingLocation;
@property (nonatomic) NSDate *backgroundLocationServiceTimeoutAllowedDate;
@property (nonatomic) NSTimer *backgroundLocationServiceTimeoutTimer;
@end
@implementation MGLLocationManager
- (instancetype)init {
self = [super init];
if (self) {
NSArray *backgroundModes = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"UIBackgroundModes"];
_hostAppHasBackgroundCapability = [backgroundModes containsObject:@"location"];
}
return self;
}
- (void)startUpdatingLocation {
if ([self isUpdatingLocation]) {
return;
}
[self configurePassiveStandardLocationManager];
[self startLocationServices];
}
- (void)stopUpdatingLocation {
if ([self isUpdatingLocation]) {
[self.standardLocationManager stopUpdatingLocation];
[self.standardLocationManager stopMonitoringSignificantLocationChanges];
self.updatingLocation = NO;
if ([self.delegate respondsToSelector:@selector(locationManagerDidStopLocationUpdates:)]) {
[self.delegate locationManagerDidStopLocationUpdates:self];
}
}
if(self.standardLocationManager.monitoredRegions.count > 0) {
for(CLRegion *region in self.standardLocationManager.monitoredRegions) {
if([region.identifier isEqualToString:MGLLocationManagerRegionIdentifier]) {
[self.standardLocationManager stopMonitoringForRegion:region];
}
}
}
}
#pragma mark - Utilities
- (void)configurePassiveStandardLocationManager {
if (!self.standardLocationManager) {
CLLocationManager *standardLocationManager = [[CLLocationManager alloc] init];
standardLocationManager.delegate = self;
standardLocationManager.desiredAccuracy = kCLLocationAccuracyThreeKilometers;
standardLocationManager.distanceFilter = MGLLocationManagerDistanceFilter;
self.standardLocationManager = standardLocationManager;
}
}
- (void)startLocationServices {
CLAuthorizationStatus authorizationStatus = [CLLocationManager authorizationStatus];
#if __IPHONE_OS_VERSION_MIN_REQUIRED >= 80000
BOOL authorizedAlways = authorizationStatus == kCLAuthorizationStatusAuthorizedAlways;
#else
BOOL authorizedAlways = authorizationStatus == kCLAuthorizationStatusAuthorized;
#endif
if (authorizedAlways || authorizationStatus == kCLAuthorizationStatusAuthorizedWhenInUse) {
// If the host app can run in the background with `always` location permissions then allow background
// updates and start the significant location change service and background timeout timer
if (self.hostAppHasBackgroundCapability && authorizedAlways) {
[self.standardLocationManager startMonitoringSignificantLocationChanges];
[self startBackgroundTimeoutTimer];
// On iOS 9 and above also allow background location updates
if ([self.standardLocationManager respondsToSelector:@selector(allowsBackgroundLocationUpdates)]) {
self.standardLocationManager.allowsBackgroundLocationUpdates = YES;
}
}
[self.standardLocationManager startUpdatingLocation];
self.updatingLocation = YES;
if ([self.delegate respondsToSelector:@selector(locationManagerDidStartLocationUpdates:)]) {
[self.delegate locationManagerDidStartLocationUpdates:self];
}
}
}
- (void)timeoutAllowedCheck {
if (self.backgroundLocationServiceTimeoutAllowedDate == nil) {
return;
}
if ([UIApplication sharedApplication].applicationState == UIApplicationStateActive ||
[UIApplication sharedApplication].applicationState == UIApplicationStateInactive ) {
[self startBackgroundTimeoutTimer];
return;
}
NSTimeInterval timeIntervalSinceTimeoutAllowed = [[NSDate date] timeIntervalSinceDate:self.backgroundLocationServiceTimeoutAllowedDate];
if (timeIntervalSinceTimeoutAllowed > 0) {
[self.standardLocationManager stopUpdatingLocation];
self.backgroundLocationServiceTimeoutAllowedDate = nil;
if ([self.delegate respondsToSelector:@selector(locationManagerBackgroundLocationUpdatesDidTimeout:)]) {
[self.delegate locationManagerBackgroundLocationUpdatesDidTimeout:self];
}
}
}
- (void)startBackgroundTimeoutTimer {
[self.backgroundLocationServiceTimeoutTimer invalidate];
self.backgroundLocationServiceTimeoutAllowedDate = [[NSDate date] dateByAddingTimeInterval:MGLLocationManagerHibernationTimeout];
self.backgroundLocationServiceTimeoutTimer = [NSTimer scheduledTimerWithTimeInterval:MGLLocationManagerHibernationPollInterval target:self selector:@selector(timeoutAllowedCheck) userInfo:nil repeats:YES];
}
- (void)establishRegionMonitoringForLocation:(CLLocation *)location {
CLCircularRegion *region = [[CLCircularRegion alloc] initWithCenter:location.coordinate radius:MGLTelemetryConfig.sharedConfig.MGLLocationManagerHibernationRadius identifier:MGLLocationManagerRegionIdentifier];
region.notifyOnEntry = NO;
region.notifyOnExit = YES;
[self.standardLocationManager startMonitoringForRegion:region];
}
#pragma mark - CLLocationManagerDelegate
- (void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status {
switch (status) {
#if __IPHONE_OS_VERSION_MIN_REQUIRED >= 80000
case kCLAuthorizationStatusAuthorizedAlways:
#else
case kCLAuthorizationStatusAuthorized:
#endif
case kCLAuthorizationStatusAuthorizedWhenInUse:
[self startUpdatingLocation];
break;
default:
[self stopUpdatingLocation];
break;
}
}
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray<CLLocation *> *)locations {
CLLocation *location = locations.lastObject;
if (location.speed > 0.0) {
[self startBackgroundTimeoutTimer];
}
if (self.standardLocationManager.monitoredRegions.count == 0 || location.horizontalAccuracy < MGLTelemetryConfig.sharedConfig.MGLLocationManagerHibernationRadius) {
[self establishRegionMonitoringForLocation:location];
}
if ([self.delegate respondsToSelector:@selector(locationManager:didUpdateLocations:)]) {
[self.delegate locationManager:self didUpdateLocations:locations];
}
}
- (void)locationManager:(CLLocationManager *)manager didExitRegion:(CLRegion *)region {
[self startBackgroundTimeoutTimer];
[self.standardLocationManager startUpdatingLocation];
}
- (void)locationManagerDidPauseLocationUpdates:(CLLocationManager *)manager {
if ([UIApplication sharedApplication].applicationState == UIApplicationStateBackground) {
if ([self.delegate respondsToSelector:@selector(locationManagerBackgroundLocationUpdatesDidAutomaticallyPause:)]) {
[self.delegate locationManagerBackgroundLocationUpdatesDidAutomaticallyPause:self];
}
}
}
@end
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