NSExtensionContext.Notifications.ObserveHostWillEnterForeground 方法
定義
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
多載
ObserveHostWillEnterForeground(EventHandler<NSNotificationEventArgs>)
常數的 HostWillEnterForegroundNotification 強型別通知。
public static Foundation.NSObject ObserveHostWillEnterForeground (EventHandler<Foundation.NSNotificationEventArgs> handler);static member ObserveHostWillEnterForeground : EventHandler<Foundation.NSNotificationEventArgs> -> Foundation.NSObject參數
- handler
- EventHandler<NSNotificationEventArgs>
張貼通知時叫用的方法。
傳回
權杖物件，可用來停止接收通知，方法是處置通知或傳遞至 RemoveObservers(IEnumerable<NSObject>)
備註
這個方法可用來訂閱 HostWillEnterForegroundNotification 通知。
// Listen to all notifications posted for any object
var token = NSExtensionContext.Notifications.ObserveHostWillEnterForeground ((notification) => {
Console.WriteLine ("Observed HostWillEnterForegroundNotification!");
};
// Listen to all notifications posted for a single object
var token = NSExtensionContext.Notifications.ObserveHostWillEnterForeground (objectToObserve, (notification) => {
Console.WriteLine ($"Observed HostWillEnterForegroundNotification for {nameof (objectToObserve)}!");
};
// Stop listening for notifications
token.Dispose ();
適用於
ObserveHostWillEnterForeground(NSObject, EventHandler<NSNotificationEventArgs>)
常數的 HostWillEnterForegroundNotification 強型別通知。
public static Foundation.NSObject ObserveHostWillEnterForeground (Foundation.NSObject objectToObserve, EventHandler<Foundation.NSNotificationEventArgs> handler);static member ObserveHostWillEnterForeground : Foundation.NSObject * EventHandler<Foundation.NSNotificationEventArgs> -> Foundation.NSObject參數
- objectToObserve
- NSObject
要觀察的物件。
- handler
- EventHandler<NSNotificationEventArgs>
張貼通知時叫用的方法。
傳回
權杖物件，可用來停止接收通知，方法是處置通知或傳遞至 RemoveObservers(IEnumerable<NSObject>)
備註
這個方法可用來訂閱 HostWillEnterForegroundNotification 通知。
// Listen to all notifications posted for any object
var token = NSExtensionContext.Notifications.ObserveHostWillEnterForeground ((notification) => {
Console.WriteLine ("Observed HostWillEnterForegroundNotification!");
};
// Listen to all notifications posted for a single object
var token = NSExtensionContext.Notifications.ObserveHostWillEnterForeground (objectToObserve, (notification) => {
Console.WriteLine ($"Observed HostWillEnterForegroundNotification for {nameof (objectToObserve)}!");
};
// Stop listening for notifications
token.Dispose ();