AVCaptureSession.Notifications.ObserveRuntimeError Method
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ObserveRuntimeError(EventHandler<AVCaptureSessionRuntimeErrorEventArgs>) |
Strongly typed notification for the RuntimeErrorNotification constant. |
ObserveRuntimeError(NSObject, EventHandler<AVCaptureSessionRuntimeErrorEventArgs>) |
Strongly typed notification for the RuntimeErrorNotification constant. |
Strongly typed notification for the RuntimeErrorNotification constant.
public static Foundation.NSObject ObserveRuntimeError (EventHandler<AVFoundation.AVCaptureSessionRuntimeErrorEventArgs> handler);
static member ObserveRuntimeError : EventHandler<AVFoundation.AVCaptureSessionRuntimeErrorEventArgs> -> Foundation.NSObject
Parameters
Method to invoke when the notification is posted.
Returns
Token object that can be used to stop receiving notifications by either disposing it or passing it to RemoveObservers(IEnumerable<NSObject>)
Remarks
The following example shows how developers can use this method in their code:
//
// Lambda style
//
// listening
notification = AVCaptureSession.Notifications.ObserveRuntimeError ((sender, args) => {
/* Access strongly typed args */
Console.WriteLine ("Notification: {0}", args.Notification);
Console.WriteLine ("Error", args.Error);
});
// To stop listening:
notification.Dispose ();
//
//Method style
//
NSObject notification;
void Callback (object sender, AVFoundation.AVCaptureSessionRuntimeErrorEventArgs args)
{
// Access strongly typed args
Console.WriteLine ("Notification: {0}", args.Notification);
Console.WriteLine ("Error", args.Error);
}
void Setup ()
{
notification = AVCaptureSession.Notifications.ObserveRuntimeError (Callback);
}
void Teardown ()
{
notification.Dispose ();
}
Applies to
Strongly typed notification for the RuntimeErrorNotification constant.
public static Foundation.NSObject ObserveRuntimeError (Foundation.NSObject objectToObserve, EventHandler<AVFoundation.AVCaptureSessionRuntimeErrorEventArgs> handler);
static member ObserveRuntimeError : Foundation.NSObject * EventHandler<AVFoundation.AVCaptureSessionRuntimeErrorEventArgs> -> Foundation.NSObject
Parameters
- objectToObserve
- NSObject
The specific object to observe.
The handler that responds to the notification when it occurs.
Returns
Token object that can be used to stop receiving notifications by either disposing it or passing it to RemoveObservers(IEnumerable<NSObject>)
Remarks
This method can be used to subscribe for RuntimeErrorNotification notifications.
// Listen to all notifications posted for any object
var token = AVCaptureSession.Notifications.ObserveRuntimeError ((notification) => {
Console.WriteLine ("Observed RuntimeErrorNotification!");
};
// Listen to all notifications posted for a single object
var token = AVCaptureSession.Notifications.ObserveRuntimeError (objectToObserve, (notification) => {
Console.WriteLine ($"Observed RuntimeErrorNotification for {nameof (objectToObserve)}!");
};
// Stop listening for notifications
token.Dispose ();