Xamarin.ios CLLocationManager和CLGeoCoder

Xamarin.ios CLLocationManager和CLGeoCoder,xamarin.ios,cllocationmanager,clgeocoder,Xamarin.ios,Cllocationmanager,Clgeocoder,我想使用实际位置的坐标(CLLocationManager)来反向地理编码(CLGeoCoder)。 我有以下代码: locationMgr = new CLLocationManager(); locationMgr.DesiredAccuracy = CLLocation.AccuracyNearestTenMeters; locationMgr.DistanceFilter = 10; locationMgr.UpdatedL

我想使用实际位置的坐标(CLLocationManager)来反向地理编码(CLGeoCoder)。 我有以下代码:

        locationMgr = new CLLocationManager();
        locationMgr.DesiredAccuracy = CLLocation.AccuracyNearestTenMeters;
        locationMgr.DistanceFilter = 10;
        locationMgr.UpdatedLocation += (object sender, CLLocationUpdatedEventArgs e) => {
            Task.latitude = e.NewLocation.Coordinate.Latitude;
            Task.longitude = e.NewLocation.Coordinate.Longitude;
            locationMgr.StopUpdatingLocation();
        };

        btnLocation = new UIBarButtonItem(UIImage.FromFile("Icons/no-gps.png"), UIBarButtonItemStyle.Plain, (s,e) => {
            if (CLLocationManager.LocationServicesEnabled) { 
                    locationMgr.StartUpdatingLocation();

                    geoCoder = new CLGeocoder();
                    geoCoder.ReverseGeocodeLocation(new CLLocation(Task.latitude, Task.longitude), (CLPlacemark[] place, NSError error) => {
                        adr = place[0].Name+"\n"+place[0].Locality+"\n"+place[0].Country;
                        Utils.ShowAlert(XmlParse.LocalText("Poloha"), Task.latitude.ToString()+"\n"+Task.longitude.ToString()+"\n\n"+adr);
                    });
            }
            else {
                Utils.ShowAlert(XmlParse.LocalText("PolohVypnut"));
            }
        });
因为UpdatedLocation()需要几秒钟,所以ReverseGeocodeLocation()的输入是Task.latitude=0和Task.longitude=0

在ReverseGeoDelocation()之前,如何等待正确的值(Task.latitude、Task.longitude)


感谢您的帮助。

CLLocationManager
获取位置之前,将调用地理编码器的
反向地理位置
方法

调用
StartUpdatingLocation
并不意味着将立即触发
UpdatedLocation
事件。此外,如果您在iOS 6上,
UpdatedLocation
将永远不会被触发。改用
LocationsUpdated
事件

例如:

locationManager.LocationsUpdated += (sender, args) => {

    // Last item in the array is the latest location
    CLLocation latestLocation = args.Locations[args.Locations.Length - 1];
    geoCoder = new CLGeocoder();
    geoCoder.ReverseGeocodeLocation(latestLocation, (pl, er) => {

        // Read placemarks here

    });

};
locationManager.StartUpdatingLocation();

在启动反向地理代码查找之前,请等待UpdatedLocation事件触发。