AVAssetTrack.Notifications.ObserveTrackAssociationsDidChange 方法
定义
重要
一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。 对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。
重载
ObserveTrackAssociationsDidChange(EventHandler<NSNotificationEventArgs>)
常量的强类型通知 TrackAssociationsDidChangeNotification 。
public static Foundation.NSObject ObserveTrackAssociationsDidChange (EventHandler<Foundation.NSNotificationEventArgs> handler);static member ObserveTrackAssociationsDidChange : EventHandler<Foundation.NSNotificationEventArgs> -> Foundation.NSObject参数
- handler
- EventHandler<NSNotificationEventArgs>
发生通知时响应通知的处理程序。
返回
令牌对象，可用于通过释放通知或将其传递给来停止接收通知 RemoveObservers(IEnumerable<NSObject>)
注解
此方法可用于订阅 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 ($"Observed TrackAssociationsDidChangeNotification for {nameof (objectToObserve)}!");
};
// Stop listening for notifications
token.Dispose ();
适用于
ObserveTrackAssociationsDidChange(NSObject, EventHandler<NSNotificationEventArgs>)
常量的强类型通知 TrackAssociationsDidChangeNotification 。
public static Foundation.NSObject ObserveTrackAssociationsDidChange (Foundation.NSObject objectToObserve, EventHandler<Foundation.NSNotificationEventArgs> handler);static member ObserveTrackAssociationsDidChange : Foundation.NSObject * EventHandler<Foundation.NSNotificationEventArgs> -> Foundation.NSObject参数
- objectToObserve
- NSObject
要观察的特定对象。
- handler
- EventHandler<NSNotificationEventArgs>
发生通知时响应通知的处理程序。
返回
令牌对象，可用于通过释放通知或将其传递给来停止接收通知 RemoveObservers(IEnumerable<NSObject>)
注解
此方法可用于订阅 TrackAssociationsDidChangeNotification 通知。
// Listen to all notifications posted for any object
var token = AVAssetTrack.Notifications.ObserveTrackAssociationsDidChange ((notification) => {
Console.WriteLine ("Observed TrackAssociationsDidChangeNotification!");
};
// Listen to all notifications posted for a single object
var token = AVAssetTrack.Notifications.ObserveTrackAssociationsDidChange (objectToObserve, (notification) => {
Console.WriteLine ($"Observed TrackAssociationsDidChangeNotification for {nameof (objectToObserve)}!");
};
// Stop listening for notifications
token.Dispose ();