Monotouch : Get user current lcoation - ios

Question

How can i get use location in monotouch?
i'm trying with following code but any events does not fire(AuthorizationChanged & LocationsUpdated)
How should i do?please advise
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

Chances are you are testing this on iOS 8.
For iOS 8 you now need to request authorization.
So use something like the following in your ViewDidLoad (make LocMgr class scope level - so remove the local instance in your version):-
LocMgr = new CLLocationManager();
if (UIDevice.CurrentDevice.CheckSystemVersion(8,0))
{
LocMgr.RequestWhenInUseAuthorization();
}
Also, in order for the above to work, and for the dialog box to show you also need to add the following entry into your info.plist:-
<key>NSLocationWhenInUseUsageDescription</key>
<value>{some message that will be shown to the end-user}</value>
Update 1:-
Code that I am using:-
In ViewDidLoad:-
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;
And the Test1 function:-
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;
}
Your need these also at class level:-
private bool locationUpdated = false;
private CLLocation currentLocation = null;
private CLLocationManager LocMgr;
Remember you need to edit your info.plist as well.
If you then run the example putting a breakpoint at the Console.WriteLine("Completed"); you should then be able to inspect objLocationInfo and see that it has a location.