ios - 如何在iPhone的背景模式下获取当前位置？

Question

我正在使用CLLocationManager获取当前位置，并且正在获取当前位置的纬度和经度值。我尚未在应用程序中使用过Mapview。因此，无论何时更改当前位置，那一次我都想将当前位置更新到服务器。每隔5分钟，我需要调用Web服务并以后台模式和前景模式的形式将当前位置更新到服务器。

-(void) getCurrentLocation
{
    // To get the current location of the place
    locationManager = [[CLLocationManager alloc] init];
    locationManager.delegate = self;
    locationManager.distanceFilter = kCLDistanceFilterNone; //whenever we move
    locationManager.desiredAccuracy = kCLLocationAccuracyBest; //100 m
    //Start the location manager, then only updates the current location
    [locationManager startUpdatingLocation];
}

/In Location manager delegate method, if the location is updated it will call and get the values from the newLocation using CLLocation  
-(void) locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
    CLLocation *location = [locationManager location];

    // Configure the new event with information from the location
    CLLocationCoordinate2D coordinate = [location coordinate];

    NSString *lat = [NSString stringWithFormat:@"%f", coordinate.latitude];
    NSString *lon = [NSString stringWithFormat:@"%f", coordinate.longitude];
    NSLog(@"dLatitude : %@", lat);
    NSLog(@"dLongitude : %@",lon);

    self.reverseGeocoder = [[[MKReverseGeocoder alloc] initWithCoordinate:newLocation.coordinate] autorelease];
    reverseGeocoder.delegate = self;
    [reverseGeocoder start];


    //Stop the location manager
    [locationManager stopUpdatingLocation];

}

每当位置更改时，那个时候我都想获取特定位置的纬度和经度。

谢谢!

Answer 1

如果您需要使用标准位置服务(即使在后台)来向用户提供连续的位置更新，则可以通过在您的应用程序中包含UIBackgroundModes键(带有“location”值)来声明您的应用需要背景位置服务应用程序的Info.plist文件。