NSExtensionContext.Notifications.ObserveHostDidEnterBackground 方法
定義
重要
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多載
ObserveHostDidEnterBackground(EventHandler<NSNotificationEventArgs>)
常數的 HostDidEnterBackgroundNotification 強型別通知。
public static Foundation.NSObject ObserveHostDidEnterBackground (EventHandler<Foundation.NSNotificationEventArgs> handler);static member ObserveHostDidEnterBackground : 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
這個方法可以用來訂閱 HostDidEnterBackgroundNotification 通知。
// Listen to all notifications posted for any object
var token = NSExtensionContext.Notifications.ObserveHostDidEnterBackground ((notification) => {
Console.WriteLine ("Observed HostDidEnterBackgroundNotification!");
};
// Listen to all notifications posted for a single object
var token = NSExtensionContext.Notifications.ObserveHostDidEnterBackground (objectToObserve, (notification) => {
Console.WriteLine ($"Observed HostDidEnterBackgroundNotification for {nameof (objectToObserve)}!");
};
// Stop listening for notifications
token.Dispose ();
適用於
ObserveHostDidEnterBackground(NSObject, EventHandler<NSNotificationEventArgs>)
常數的 HostDidEnterBackgroundNotification 強型別通知。
public static Foundation.NSObject ObserveHostDidEnterBackground (Foundation.NSObject objectToObserve, EventHandler<Foundation.NSNotificationEventArgs> handler);static member ObserveHostDidEnterBackground : Foundation.NSObject * EventHandler<Foundation.NSNotificationEventArgs> -> Foundation.NSObject參數
- objectToObserve
- NSObject
要觀察的物件。
- handler
- EventHandler<NSNotificationEventArgs>
張貼通知時叫用的方法。
傳回
權杖物件，可用來停止接收通知，方法是處置通知或傳遞至 RemoveObservers(IEnumerable<NSObject>)
備註
這個方法可以用來訂閱 HostDidEnterBackgroundNotification 通知。
// Listen to all notifications posted for any object
var token = NSExtensionContext.Notifications.ObserveHostDidEnterBackground ((notification) => {
Console.WriteLine ("Observed HostDidEnterBackgroundNotification!");
};
// Listen to all notifications posted for a single object
var token = NSExtensionContext.Notifications.ObserveHostDidEnterBackground (objectToObserve, (notification) => {
Console.WriteLine ($"Observed HostDidEnterBackgroundNotification for {nameof (objectToObserve)}!");
};
// Stop listening for notifications
token.Dispose ();