Question

我正在尝试实施延迟的位置更新，以获得更好的电池消耗。我正在这样开始我的位置经理：

- (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];
}

以这种方式启动延迟更新：

- (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;
}

我每隔30秒就会didFinishDeferredUpdates一次登录，但是didUpdateLocations每秒都会保持呼叫，不再尝试优化电池消耗。假设位置管理员每隔30秒调用一次didUpdateLocations吗？

Answer 1

也许你没有采用正确的方法，left: calc( 50% - half of the div of the svg)告诉GPS硬件在内部存储新的位置，直到满足指定的距离或超时条件。

来自iOS开发者库：

如果您的应用位于前台，则位置管理员不会推迟事件的传递，但会监控指定的条件。如果您的应用在符合条件之前移至后台，则位置管理员可能会开始推迟发送事件。 Link

Answer 2

你在调试吗？

如答案中所述：ios deferred location updates fail to defer

仅在系统进入低功耗状态时才会传递延迟更新。调试期间不会发生延迟更新，因为Xcode会阻止您的应用程序休眠，从而阻止系统进入低功耗状态。

Answer 3

我相信您一次只需要其中一个，更改applicationDidEnterBackground和applicationWillEnterForeground

中的来电

- (**void)applicationDidEnterBackground:(UIApplication *)application {

    // Need to stop regular updates first
    [self.locationManager stopUpdatingLocation];
    // Only monitor significant changes
    [self.locationManager startMonitoringSignificantLocationChanges];
}

- (void)applicationWillEnterForeground:(UIApplication *)application {
    // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
    [self.locationManager stopMonitoringSignificantLocationChanges];
    [self.locationManager startUpdatingLocation];
}

didUpdateLocations持续调用延迟更新

3 个答案: