Question

我想检查用户是否在附近。例如，我已指定用户当前位置周围50米的半径。假设用户是否在移动，现在我要检查用户是否在50米半径范围内。这是我的代码

 override func viewDidLoad() {
        super.viewDidLoad()

          locationManager.startMonitoringVisits()
          locationManager.delegate = self
          locationManager.distanceFilter = 1
          locationManager.allowsBackgroundLocationUpdates = true
          locationManager.startUpdatingLocation() 
    }

这是检查距离的代码


    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {

        guard let location = locations.first else {
            return
        }
        let officeLocation = CLLocationCoordinate2D.init(latitude: 31.471303736482234, longitude: 74.27275174139386)

        let circle = MKCircle(center: officeLocation, radius: 50 as CLLocationDistance)
        if location.distance(from: officeLocation) > circle.radius {
            self.newVisitReceived(des: "YOU ARE OUT OF OFFICE")
        }
        else{ 
            self.newVisitReceived(des: "YOU ARE IN OFFICE")
         }

    }

即使我不移动此代码，也会发送通知“ YOU ARE OUT”。

Answer 1

定位服务的普遍问题是，测量的准确性会有所不同，这取决于许多因素。如果用户站在50米的边界上，您希望代码的行为如何？如果准确性很差，那么您当前的代码将在“在办公室”和“不在办公室”之间随机地来回切换。

我认为在最佳条件下，GPS的精度实际上超过4米，因此distanceFilter为1可能不合适。

我想您可能需要在应用中使用某种状态来跟踪何时用户在50米半径内的最后一次出现，还需要一些宽限期才能再次更新该变量，以避免“闪烁”

Answer 2

我会用Geofences解决这个问题... 您必须指定坐标中心和半径，以便用户在地理围栏的内部/外部进入时要在该位置收听。

override func viewDidLoad() {
    super.viewDidLoad()

    let locationManager = CLLocationManager()
    locationManager.delegate = self
    locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation
    locationManager.allowsBackgroundLocationUpdates = true
    locationManager.requestAlwaysAuthorization()
}

func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
    if status == .authorizedAlways || status == .authorizedWhenInUse {

        // CLLocationCoordinate2D; You have to put the coordinate that you want to listen
        let region = CLCircularRegion(center: CLLocationCoordinate2D(latitude: 324234, longitude: 23423), radius: 50, identifier: "Ur ID")
        region.notifyOnExit = true
        region.notifyOnEntry = true
        manager.startMonitoring(for: region)
    }
}

func locationManager(_ manager: CLLocationManager, didExitRegion region: CLRegion) {
    // User has exited from ur regiom
}

func locationManager(_ manager: CLLocationManager, didEnterRegion region: CLRegion) {
    // User has exited from ur region
}

我希望这会有用

如何检查用户的当前位置是否在位置圈内

2 个答案: