Question

如何在单色触控中使用位置？我正在尝试使用以下代码，但任何事件都不会触发（AuthorizationChanged＆amp; LocationsUpdated）
我该怎么办？请告知

public Task<CLLocation> test()
{
    TaskCompletionSource<CLLocation> objTaskCompletionSource1 = new TaskCompletionSource<CLLocation> ();
    CLLocation currentLocation = null;
    CLLocationManager LocMgr = new CLLocationManager ();
    if (CLLocationManager.LocationServicesEnabled) 
    {
        LocMgr.LocationsUpdated += (object sender, CLLocationsUpdatedEventArgs e) => 
        {
            currentLocation = e.Locations [e.Locations.Length - 1];
            locationUpdated = false;
            if (currentLocation != null && AllAreas != null) 
            {
                LocationDetector.Instance.UpdateCurrentArea (new RLatLng (currentLocation.Coordinate.Latitude, currentLocation.Coordinate.Longitude));
                objTaskCompletionSource1.SetResult(currentLocation);
            }
            else
            {
                currentLocation = null;
                objTaskCompletionSource1.SetResult(currentLocation);
            }
        };
        LocMgr.AuthorizationChanged+= (object sender, CLAuthorizationChangedEventArgs e) => {
            Console.WriteLine("AuthorizationChanged Fired");
        };
        LocMgr.Failed += (object sender, NSErrorEventArgs e) => 
        {

        };
        LocMgr.StartUpdatingLocation ();
    } 
    else 
    {
        currentLocation = null;
        objTaskCompletionSource1.SetResult (currentLocation);
        Console.WriteLine ("Location services not enabled, please enable this in your Settings");
    }
    return objTaskCompletionSource1.Task;
}

Answer 1

您可能正在 iOS 8 上对此进行测试。

对于 iOS 8 ，您现在需要请求授权。

因此，在 ViewDidLoad 中使用以下内容（制作LocMgr类作用域级别 - 因此请删除版本中的本地实例）： -

LocMgr = new CLLocationManager();
if (UIDevice.CurrentDevice.CheckSystemVersion(8,0))
{
    LocMgr.RequestWhenInUseAuthorization();
}

此外，为了使上述功能正常工作，并且对话框显示您还需要将以下条目添加到 info.plist 中： -

<key>NSLocationWhenInUseUsageDescription</key>
<value>{some message that will be shown to the end-user}</value>

更新1： -

我正在使用的代码： -

在 ViewDidLoad 中： -

        LocMgr = new CLLocationManager ();
        if (UIDevice.CurrentDevice.CheckSystemVersion (8, 0)) {
            LocMgr.RequestWhenInUseAuthorization ();
        }

        UIButton objButton1 = new UIButton (UIButtonType.RoundedRect);
        objButton1.SetTitle ("Click Me", UIControlState.Normal);
        objButton1.TouchUpInside += (async (o2, e2) => {
            CLLocation objLocationInfo = await Test1();
            Console.WriteLine("Completed");
        });
        this.View = objButton1;

Test1功能： -

    public Task<CLLocation> Test1()
    {
        TaskCompletionSource<CLLocation> objTaskCompletionSource1 = new TaskCompletionSource<CLLocation> ();
        CLLocation currentLocation = null;
        if (CLLocationManager.LocationServicesEnabled) {
            LocMgr.LocationsUpdated += (object sender, CLLocationsUpdatedEventArgs e) => {
                currentLocation = e.Locations [e.Locations.Length - 1];
                locationUpdated = false;
                //if (currentLocation != null && AllAreas != null) {
                if (currentLocation != null) {
                    //LocationDetector.Instance.UpdateCurrentArea (new RLatLng (currentLocation.Coordinate.Latitude, currentLocation.Coordinate.Longitude));
                    objTaskCompletionSource1.SetResult (currentLocation);
                } else {
                    currentLocation = null;
                    objTaskCompletionSource1.SetResult (currentLocation);
                }
            };
            LocMgr.AuthorizationChanged += (object sender, CLAuthorizationChangedEventArgs e) => {
                Console.WriteLine ("AuthorizationChanged Fired");
            };
            LocMgr.Failed += (object sender, NSErrorEventArgs e) => {
                Console.WriteLine("AHH Failed");
            };
            LocMgr.StartUpdatingLocation ();
        } else {
            currentLocation = null;
            objTaskCompletionSource1.SetResult (currentLocation);
            Console.WriteLine ("Location services not enabled, please enable this in your Settings");
        }
        return objTaskCompletionSource1.Task;
    }

您在课堂上也需要这些： -

    private bool locationUpdated = false;
    private CLLocation currentLocation = null;

    private CLLocationManager LocMgr;

请记住，您还需要修改 info.plist 。

如果您运行示例在Console.WriteLine("Completed");放置一个断点，那么您应该能够检查objLocationInfo并看到它有一个位置。

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1 个答案: