ios - didUpdateLocations 每秒通过延迟更新不断调用

Question

我正在尝试实现延迟位置更新以获得更好的电池消耗。我正在这样启动我的位置管理器:

- (void)initCoreLocation
{
    self.locationManager = [[CLLocationManager alloc] init];
    self.locationManager.delegate = self;
    self.locationManager.distanceFilter = kCLDistanceFilterNone;
    self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    self.locationManager.pausesLocationUpdatesAutomatically = YES;
    self.locationManager.activityType = CLActivityTypeAutomotiveNavigation;

    //Très important pour iOS9 !
    if ([self.locationManager respondsToSelector:@selector(allowsBackgroundLocationUpdates)]) {
        self.locationManager.allowsBackgroundLocationUpdates=YES;
    }

    if ([self.locationManager respondsToSelector:@selector(requestAlwaysAuthorization)]) {
        [self.locationManager requestAlwaysAuthorization];
    }

    [self.locationManager startUpdatingLocation];
    [self.locationManager startMonitoringSignificantLocationChanges];
}

然后像这样开始延迟更新:

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{

    if (!self.deferringUpdates) {
        [self.locationManager allowDeferredLocationUpdatesUntilTraveled:CLLocationDistanceMax timeout:30];
        self.deferringUpdates = YES;
    }
}

-(void)locationManager:(CLLocationManager *)manager didFinishDeferredUpdatesWithError:(NSError *)error { // Stop deferring updates
    if(error) {
        NSLog(@"error");
    }
    NSLog(@"didFinishDeferredUpdates");
    self.deferringUpdates = NO;
}

我每 30 秒记录一次 didFinishDeferredUpdates，但是 didUpdateLocations 每秒都在调用，消除了任何优化电池消耗的尝试。是否假设位置管理器每 30 秒调用一次 didUpdateLocations？

Answer 1

也许您没有采用正确的方法，因为 allowDeferredLocationUpdatesUntilTraveled() 告诉 GPS 硬件在内部存储新位置，直到满足指定的距离或超时条件。

来自 iOS 开发者库:

If your app is in the foreground, the location manager does not defer the deliver of events but does monitor for the specified criteria. If your app moves to the background before the criteria are met, the location manager may begin deferring the delivery of events. Link