AVCaptureDevice.Notifications.ObserveWasDisconnected 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
ObserveWasDisconnected(EventHandler<NSNotificationEventArgs>)
常數的 WasDisconnectedNotification 強型別通知。
public static Foundation.NSObject ObserveWasDisconnected (EventHandler<Foundation.NSNotificationEventArgs> handler);static member ObserveWasDisconnected : 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
下列範例示範如何在程式碼中使用此方法
//
// Lambda style
//
// listening
notification = AVCaptureDevice.Notifications.ObserveWasDisconnected ((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 = AVCaptureDevice.Notifications.ObserveWasDisconnected (Callback);
}
void Teardown ()
{
notification.Dispose ();
}
適用於
ObserveWasDisconnected(NSObject, EventHandler<NSNotificationEventArgs>)
常數的 WasDisconnectedNotification 強型別通知。
public static Foundation.NSObject ObserveWasDisconnected (Foundation.NSObject objectToObserve, EventHandler<Foundation.NSNotificationEventArgs> handler);static member ObserveWasDisconnected : Foundation.NSObject * EventHandler<Foundation.NSNotificationEventArgs> -> Foundation.NSObject參數
- objectToObserve
- NSObject
要觀察的特定物件。
- handler
- EventHandler<NSNotificationEventArgs>
在發生通知時回應通知的處理常式。
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 WasDisconnectedNotification 通知。
// Listen to all notifications posted for any object
var token = AVCaptureDevice.Notifications.ObserveWasDisconnected ((notification) => {
Console.WriteLine ("Observed WasDisconnectedNotification!");
};
// Listen to all notifications posted for a single object
var token = AVCaptureDevice.Notifications.ObserveWasDisconnected (objectToObserve, (notification) => {
Console.WriteLine ($"Observed WasDisconnectedNotification for {nameof (objectToObserve)}!");
};
// Stop listening for notifications
token.Dispose ();