UIWindow.Notifications.ObserveDidBecomeKey Method
Definition
Important
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Overloads
| Name | Description |
|---|---|
| ObserveDidBecomeKey(EventHandler<NSNotificationEventArgs>) |
Strongly typed notification for the DidBecomeKeyNotification constant. |
| ObserveDidBecomeKey(NSObject, EventHandler<NSNotificationEventArgs>) |
Strongly typed notification for the DidBecomeKeyNotification constant. |
ObserveDidBecomeKey(EventHandler<NSNotificationEventArgs>)
Strongly typed notification for the DidBecomeKeyNotification constant.
public static Foundation.NSObject ObserveDidBecomeKey(EventHandler<Foundation.NSNotificationEventArgs> handler);static member ObserveDidBecomeKey : EventHandler<Foundation.NSNotificationEventArgs> -> Foundation.NSObjectParameters
- handler
- EventHandler<NSNotificationEventArgs>
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 to DidBecomeKeyNotification notifications.
// Listen to all notifications posted for any object
var token = UIWindow.Notifications.ObserveDidBecomeKey ((notification) => {
Console.WriteLine ("Observed DidBecomeKeyNotification!");
};
// Stop listening for notifications
token.Dispose ();
Applies to
ObserveDidBecomeKey(NSObject, EventHandler<NSNotificationEventArgs>)
Strongly typed notification for the DidBecomeKeyNotification constant.
public static Foundation.NSObject ObserveDidBecomeKey(Foundation.NSObject objectToObserve, EventHandler<Foundation.NSNotificationEventArgs> handler);static member ObserveDidBecomeKey : Foundation.NSObject * EventHandler<Foundation.NSNotificationEventArgs> -> Foundation.NSObjectParameters
- objectToObserve
- NSObject
The specific object to observe.
- handler
- EventHandler<NSNotificationEventArgs>
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 to DidBecomeKeyNotification notifications.
// Listen to all notifications posted for a single object
var token = UIWindow.Notifications.ObserveDidBecomeKey (objectToObserve, (notification) => {
Console.WriteLine ($"Observed DidBecomeKeyNotification for {nameof (objectToObserve)}!");
};
// Stop listening for notifications
token.Dispose ();