ios - 地理位置异步 iOS

Question

我想在后台进行地理定位！但我不能，我尝试了调度程序、线程、操作等……但我都阻止了进度条的进度。

Answer 1

我在这样的位置使用单例对象......

@implementation LocationManager

#pragma mark - singleton method

+ (LocationManager*)sharedInstance
{
    static dispatch_once_t predicate = 0;
    __strong static id sharedObject = nil;
    dispatch_once(&predicate, ^{
        sharedObject = [[self alloc] init];
    });
    return sharedObject;
}

#pragma mark - instance methods

-(id) init {
    if (self = [super init]) {
        _currentLocation = [[CLLocation alloc] init];
        _locationManager = [[CLLocationManager alloc] init];
        _locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters;
        _locationManager.delegate = self;
    }
    return self;
}

- (void)start
{
    [self.locationManager startUpdatingLocation];
}

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
    //if the time interval returned from core location is more than two minutes we ignore it because it might be from an old session
    if ( abs((int) [newLocation.timestamp timeIntervalSinceDate: [NSDate date]]) < 120) {
        self.currentLocation = newLocation;
    }
}

- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {
//    [[[UIAlertView alloc] initWithTitle:@"Error" message:[error description] delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil] show];
}

@end

那我只需要打电话...

[[LocationManager sharedInstance] start];

单身人士将开始跟踪位置。

比我打电话...

[[LocationManager sharedInstance] currentLocation];

对于当前位置。

然后，您可以使用它传递到 CLGeocoder 已经异步的方法中。

您不能依靠启动位置跟踪然后立即获得位置。您需要使用这样的方法。

Answer 2

CLGeocoder 在后台运行。