AVAssetTrack.Notifications.ObserveTrackAssociationsDidChange 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
ObserveTrackAssociationsDidChange(EventHandler<NSNotificationEventArgs>)
常數的 TrackAssociationsDidChangeNotification 強型別通知。
public static Foundation.NSObject ObserveTrackAssociationsDidChange(EventHandler<Foundation.NSNotificationEventArgs> handler);static member ObserveTrackAssociationsDidChange : EventHandler<Foundation.NSNotificationEventArgs> -> Foundation.NSObject參數
- 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 TrackAssociationsDidChangeNotification 通知。
// Listen to all notifications posted for any object
var token = AVAssetTrack.Notifications.ObserveTrackAssociationsDidChange ((notification) => {
Console.WriteLine ("Observed TrackAssociationsDidChangeNotification!");
};
// Listen to all notifications posted for a single object
var token = AVAssetTrack.Notifications.ObserveTrackAssociationsDidChange (objectToObserve, (notification) => {
Console.WriteLine ($"Observed TrackAssociationsDidChangeNotification for {nameof (objectToObserve)}!");
};
// Stop listening for notifications
token.Dispose ();
適用於
ObserveTrackAssociationsDidChange(NSObject, EventHandler<NSNotificationEventArgs>)
常數的 TrackAssociationsDidChangeNotification 強型別通知。
public static Foundation.NSObject ObserveTrackAssociationsDidChange(Foundation.NSObject objectToObserve, EventHandler<Foundation.NSNotificationEventArgs> handler);static member ObserveTrackAssociationsDidChange : Foundation.NSObject * EventHandler<Foundation.NSNotificationEventArgs> -> Foundation.NSObject參數
- objectToObserve
- NSObject
要觀察的特定物件。
- handler
- EventHandler<NSNotificationEventArgs>
在發生通知時回應通知的處理常式。
傳回
權杖物件，可用來停止接收通知，方法是處置通知或傳遞至 RemoveObservers(IEnumerable<NSObject>)
備註
這個方法可以用來訂閱 TrackAssociationsDidChangeNotification 通知。
// Listen to all notifications posted for any object
var token = AVAssetTrack.Notifications.ObserveTrackAssociationsDidChange ((notification) => {
Console.WriteLine ("Observed TrackAssociationsDidChangeNotification!");
};
// Listen to all notifications posted for a single object
var token = AVAssetTrack.Notifications.ObserveTrackAssociationsDidChange (objectToObserve, (notification) => {
Console.WriteLine ($"Observed TrackAssociationsDidChangeNotification for {nameof (objectToObserve)}!");
};
// Stop listening for notifications
token.Dispose ();