Question

我正在尝试将用户的当前位置保存到Firebase中，其中包括时间和地址。基本上，我的代码可以正常工作，但是仅第一个位置地址始终显示“标签”，而不显示地址。因此，当我重新运行该应用程序时，它在Firebase实时数据库中始终具有标签数据。我不知道该如何解决。我在下面附加了代码和数据库图片。

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    if locations.count > 0 {
        let location = locations[locations.count-1]
        let maxAge:TimeInterval = 60;
        let requiredAccuracy:CLLocationAccuracy = 80;
        let locationIsValid:Bool = Date().timeIntervalSince(location.timestamp) < maxAge && location.horizontalAccuracy <= requiredAccuracy;
        if locationIsValid
        {
            NSLog(",,, location : %@",location);
            NSLog("valid locations.....");
        }
    }

    let region = MKCoordinateRegion(center: CLLocationCoordinate2D(latitude: locations[0].coordinate.latitude, longitude: locations[0].coordinate.longitude), span: MKCoordinateSpan(latitudeDelta: 0.005, longitudeDelta: 0.005))
    self.mapView.setRegion(region, animated: true)

    CLGeocoder().reverseGeocodeLocation(manager.location!) { (placemarks, error) in
        if error != nil{
            print("Error: " + (error?.localizedDescription)!)
            return
        }
        let pm = placemarks! as [CLPlacemark]
        if pm.count > 0 {
            let pm = placemarks![0]

            let subThoroughfare = pm.subThoroughfare ?? ""
            let thoroughfare = pm.thoroughfare ?? ""
            let locality = pm.locality ?? ""
            let administrativeArea = pm.administrativeArea ?? ""
            let postalCode = pm.postalCode ?? ""
            let country = pm.country ?? ""
            let address = (subThoroughfare)+" "+(thoroughfare)+" "+(locality)+","+(administrativeArea)+" "+(postalCode)+" "+(country)

            self.myAddress.text = "\(address)"
        }
    }
    let formatter = DateFormatter()
    formatter.dateFormat = "yyyy-MM-dd, HH:mm:ss"
    formatter.timeZone = NSTimeZone.local
    let timestampFormattedStr = formatter.string(from: (locationManager.location?.timestamp)!)
    let timeZone = NSTimeZone(forSecondsFromGMT: NSTimeZone.local.secondsFromGMT())
    let timeZoneName = timeZone.localizedName(.standard, locale: NSLocale.current)
    let timestampWithTimeZone = "\(timestampFormattedStr) \(String(describing: timeZoneName))"
    let values = ["Time": timestampWithTimeZone,"Address": myAddress.text as Any]

    let ref = Database.database().reference()
    ref.child("userLocations").childByAutoId().setValue(values)
}

下面是我的数据库图片

Answer 1

reverseGeocodeLocation块是异步的。这意味着您的Firebase代码在调用该块之前发生。分配self.myAddress时，您已提交到数据库。要解决此问题，请将firebase代码放入代码块中。

if pm.count > 0 {
        let pm = placemarks![0]

        let subThoroughfare = pm.subThoroughfare ?? ""
        let thoroughfare = pm.thoroughfare ?? ""
        let locality = pm.locality ?? ""
        let administrativeArea = pm.administrativeArea ?? ""
        let postalCode = pm.postalCode ?? ""
        let country = pm.country ?? ""
        let address = (subThoroughfare)+" "+(thoroughfare)+" "+(locality)+","+(administrativeArea)+" "+(postalCode)+" "+(country)

        self.myAddress.text = "\(address)"
        let formatter = DateFormatter()
        formatter.dateFormat = "yyyy-MM-dd, HH:mm:ss"
        formatter.timeZone = NSTimeZone.local
        let timestampFormattedStr = formatter.string(from: (locationManager.location?.timestamp)!)
        let timeZone = NSTimeZone(forSecondsFromGMT: NSTimeZone.local.secondsFromGMT())
        let timeZoneName = timeZone.localizedName(.standard, locale: NSLocale.current)
        let timestampWithTimeZone = "\(timestampFormattedStr) \(String(describing: timeZoneName))"
        let values = ["Time": timestampWithTimeZone,"Address": myAddress.text as Any]

        let ref = Database.database().reference()
        ref.child("userLocations").childByAutoId().setValue(values)
        }
    }

Answer 2

遵循以下代码：

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {        
    manager.stopUpdatingLocation()
    if let location = locations.last {
        latitudeLabel.text = "Latitude: " + "\(location.coordinate.latitude)"
        longitudeLabel.text = "Longitude: " + "\(location.coordinate.longitude)"

        let geoCoder = CLGeocoder()
        geoCoder.reverseGeocodeLocation(location) { (placemarks, error) in
            if error != nil {
                print("Error found while reverse GEO coding.")
                return
            }

            if let placemark = placemarks?.first {
                var fullAddress = ""
                if let name = placemark.name {
                    fullAddress.append("Name: " + name)
                }

                if let country = placemark.country {
                    fullAddress.append("\nCountry: " + country)
                }

                if let countryCode = placemark.isoCountryCode {
                    fullAddress.append("\nCountry code: " + countryCode)
                }

                if let locality = placemark.locality {
                    fullAddress.append("\nLocality: " + locality)
                }

                if let postal = placemark.postalCode {
                    fullAddress.append("\nPostal: " + postal)
                }

                if let thoroughfare = placemark.thoroughfare {
                    fullAddress.append("\nThoroughfare: " + thoroughfare)
                }

                if let administrativeArea = placemark.administrativeArea {
                    fullAddress.append("\nAdministrativeArea: " + administrativeArea)
                }

                if let subLocality = placemark.subLocality {
                    fullAddress.append("\nSubLocality: " + subLocality)
                }
            }
        }
    }
}

您必须停止更新位置。

希望您遇到问题了，此代码将为您工作。

有关将用户当前位置保存到数据库中的问题

2 个答案: