UIBarItem.Notifications.ObserveElementFocused Method
Definition
Important
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Overloads
| ObserveElementFocused(EventHandler<NSNotificationEventArgs>) |
Strongly typed notification for the ElementFocusedNotification constant. |
| ObserveElementFocused(NSObject, EventHandler<NSNotificationEventArgs>) |
Strongly typed notification for the ElementFocusedNotification constant. |
ObserveElementFocused(EventHandler<NSNotificationEventArgs>)
Strongly typed notification for the ElementFocusedNotification constant.
public static Foundation.NSObject ObserveElementFocused (EventHandler<Foundation.NSNotificationEventArgs> handler);static member ObserveElementFocused : 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
This method can be used to subscribe for ElementFocusedNotification notifications.
// Listen to all notifications posted for any object
var token = UIBarItem.Notifications.ObserveElementFocused ((notification) => {
Console.WriteLine ("Observed ElementFocusedNotification!");
};
// Listen to all notifications posted for a single object
var token = UIBarItem.Notifications.ObserveElementFocused (objectToObserve, (notification) => {
Console.WriteLine ($"Observed ElementFocusedNotification for {nameof (objectToObserve)}!");
};
// Stop listening for notifications
token.Dispose ();
Applies to
ObserveElementFocused(NSObject, EventHandler<NSNotificationEventArgs>)
Strongly typed notification for the ElementFocusedNotification constant.
public static Foundation.NSObject ObserveElementFocused (Foundation.NSObject objectToObserve, EventHandler<Foundation.NSNotificationEventArgs> handler);static member ObserveElementFocused : Foundation.NSObject * EventHandler<Foundation.NSNotificationEventArgs> -> Foundation.NSObjectParameters
- objectToObserve
- NSObject
The object to observe.
- handler
- EventHandler<NSNotificationEventArgs>
Method to invoke when the notification is posted.
Returns
Token object that can be used to stop receiving notifications by either disposing it or passing it to RemoveObservers(IEnumerable<NSObject>)
Remarks
This method can be used to subscribe for ElementFocusedNotification notifications.
// Listen to all notifications posted for any object
var token = UIBarItem.Notifications.ObserveElementFocused ((notification) => {
Console.WriteLine ("Observed ElementFocusedNotification!");
};
// Listen to all notifications posted for a single object
var token = UIBarItem.Notifications.ObserveElementFocused (objectToObserve, (notification) => {
Console.WriteLine ($"Observed ElementFocusedNotification for {nameof (objectToObserve)}!");
};
// Stop listening for notifications
token.Dispose ();