UIWindow.Notifications.ObserveDidResignKey Method
Definition
Important
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Overloads
| ObserveDidResignKey(EventHandler<NSNotificationEventArgs>) |
Strongly typed notification for the DidResignKeyNotification constant. |
| ObserveDidResignKey(NSObject, EventHandler<NSNotificationEventArgs>) |
Strongly typed notification for the DidResignKeyNotification constant. |
ObserveDidResignKey(EventHandler<NSNotificationEventArgs>)
Strongly typed notification for the DidResignKeyNotification constant.
public static Foundation.NSObject ObserveDidResignKey (EventHandler<Foundation.NSNotificationEventArgs> handler);static member ObserveDidResignKey : EventHandler<Foundation.NSNotificationEventArgs> -> Foundation.NSObjectParameters
- handler
- EventHandler<NSNotificationEventArgs>
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 you can use this method in your code
//
// Lambda style
//
// listening
notification = UIWindow.Notifications.ObserveDidResignKey ((sender, args) => {
/* Access strongly typed args */
Console.WriteLine ("Notification: {0}", args.Notification);
});
// To stop listening:
notification.Dispose ();
//
//Method style
//
NSObject notification;
void Callback (object sender, Foundation.NSNotificationEventArgs args)
{
// Access strongly typed args
Console.WriteLine ("Notification: {0}", args.Notification);
}
void Setup ()
{
notification = UIWindow.Notifications.ObserveDidResignKey (Callback);
}
void Teardown ()
{
notification.Dispose ();
}
Applies to
ObserveDidResignKey(NSObject, EventHandler<NSNotificationEventArgs>)
Strongly typed notification for the DidResignKeyNotification constant.
public static Foundation.NSObject ObserveDidResignKey (Foundation.NSObject objectToObserve, EventHandler<Foundation.NSNotificationEventArgs> handler);static member ObserveDidResignKey : Foundation.NSObject * EventHandler<Foundation.NSNotificationEventArgs> -> Foundation.NSObjectParameters
- objectToObserve
- NSObject
The object to observe.
- handler
- EventHandler<NSNotificationEventArgs>
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
This method can be used to subscribe for DidResignKeyNotification notifications.
// Listen to all notifications posted for any object
var token = UIWindow.Notifications.ObserveDidResignKey ((notification) => {
Console.WriteLine ("Observed DidResignKeyNotification!");
};
// Listen to all notifications posted for a single object
var token = UIWindow.Notifications.ObserveDidResignKey (objectToObserve, (notification) => {
Console.WriteLine ($"Observed DidResignKeyNotification for {nameof (objectToObserve)}!");
};
// Stop listening for notifications
token.Dispose ();