CLLocationManager問題

Question

我想獲得一個位置，然后停止從CLLocationManager通知。

我這樣做：

-(id)initWithDelegate:(id <GPSLocationDelegate>)aDelegate{
self = [super init];

if(self != nil) {
    locationManager = [[CLLocationManager alloc] init];
    locationManager.delegate = self;
    delegate = aDelegate;

}
return self;
}

-(void)startUpdating{
    locationManager.distanceFilter = kCLDistanceFilterNone;
    locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters;
    [locationManager startUpdatingLocation];
}

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
    [locationManager stopUpdatingLocation];
    [delegate locationUpdate:newLocation];
}

問題是，即使我執行[locationManager stopUpdatingLocation];

在- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:

我仍然收到通知，知道為什么會發生嗎？

Answer 1

也許嘗試我的解決方案。 我正在構建兩個用於處理LocationManger Obj的功能。 第一個功能是startUpdates，用於句柄開始更新位置。 代碼如下：

- (void)startUpdate
{
    if ([self locationManager])
    {
        [[self locationManager] stopUpdatingLocation];
    }
    else
    {
        self.locationManager = [[CLLocationManager alloc] init];
        [[self locationManager] setDelegate:self];
        [[self locationManager] setDesiredAccuracy:kCLLocationAccuracyBestForNavigation];
        [[self locationManager] setDistanceFilter:10.0];
    }

    [[self locationManager] startUpdatingLocation];
}

第二個函數是stopUpdate，用於句柄CLLocationDelegate停止更新位置。 代碼如下：

- (void)stopUpdate
{
    if ([self locationManager])
    {
        [[self locationManager] stopUpdatingLocation];
    }
}

因此，對於CLLocationManagerDelegate應該看起來像這樣：

- (void)locationManager:(CLLocationManager *)manager
    didUpdateToLocation:(CLLocation *)newLocation
           fromLocation:(CLLocation *)oldLocation
{    
    NSDate* eventDate = newLocation.timestamp;
    NSTimeInterval howRecent = [eventDate timeIntervalSinceNow];
    self.attempts++;

    if(firstPosition == NO)
    {
        if((howRecent < -2.0 || newLocation.horizontalAccuracy > 50.0) && ([self attempts] < 5))
        {
            // force an update, value is not good enough for starting Point            
            [self startUpdates];
            return;
        }
        else
        {
            firstPosition = YES;
            isReadyForReload = YES;
            tempNewLocation = newLocation;
            NSLog(@"## Latitude  : %f", tempNewLocation.coordinate.latitude);
            NSLog(@"## Longitude : %f", tempNewLocation.coordinate.longitude);
            [self stopUpdate];
        }
    }
}

在上面的此函數中，我只對更新位置的最佳位置進行了糾正。 希望我的回答會有所幫助，干杯。

Answer 2

我認為您的問題的原因在於距離過濾器。 正如文檔所說：

Use the value kCLDistanceFilterNone to be notified of all movements. The default value of this property is kCLDistanceFilterNone. 這樣，您就可以設置-持續更新。