public async Task<GeofenceStatus> RequestState(GeofenceRegion region, CancellationToken? cancelToken)
{
var tcs = new TaskCompletionSource<GeofenceStatus>();
cancelToken?.Register(() => tcs.TrySetCanceled());
var handler = new EventHandler<CLRegionStateDeterminedEventArgs>((sender, args) =>
{
var clregion = args.Region as CLCircularRegion;
if (clregion?.Identifier.Equals(region.Identifier) ?? false)
{
var state = this.FromNative(args.State);
tcs.TrySetResult(state);
}
});
try
{
this.locationManager.DidDetermineState += handler;
var native = this.ToNative(region);
this.locationManager.RequestState(native);
return await tcs.Task;
}
finally
{
this.locationManager.DidDetermineState -= handler;
}
}
public void StartMonitoring(GeofenceRegion region)
{
//if !CLLocationManager.isMonitoringAvailableForClass(CLCircularRegion) {
UIApplication.SharedApplication.InvokeOnMainThread(() =>
{
var native = this.ToNative(region);
this.locationManager.StartMonitoring(native);
});
//this.locationManager.DesiredAccuracy
//this.locationManager.StartMonitoring(native, this.DesiredAccuracy.TotalMeters);
}
public void Remove(GeofenceRegion region)
{
this.MonitoredRegions.Remove(region);
this.OnPropertyChanged(nameof(MonitoredRegions));
}
public GeofenceViewModel(GeofenceRegion region, ICommand removeCommand)
{
this.Region = region;
this.Remove = removeCommand;
}
public GeofenceStatusChangedEventArgs(GeofenceRegion region, GeofenceStatus status)
{
this.Region = region;
this.Status = status;
}
public void StopMonitoring(GeofenceRegion region)
{
var native = this.ToNative(region);
this.locationManager.StopMonitoring(native);
}
protected virtual CLCircularRegion ToNative(GeofenceRegion region)
{
return new CLCircularRegion(
this.ToNative(region.Center),
region.Radius.TotalMeters,
region.Identifier
)
{
NotifyOnExit = true,
NotifyOnEntry = true
};
}
