AVAsset.Notifications.ObserveContainsFragmentsDidChange 方法
定义
重要
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重载
ObserveContainsFragmentsDidChange(EventHandler<NSNotificationEventArgs>)
常量的强类型通知 ContainsFragmentsDidChangeNotification 。
public static Foundation.NSObject ObserveContainsFragmentsDidChange (EventHandler<Foundation.NSNotificationEventArgs> handler);static member ObserveContainsFragmentsDidChange : EventHandler<Foundation.NSNotificationEventArgs> -> Foundation.NSObject参数
- handler
- EventHandler<NSNotificationEventArgs>
返回
令牌对象，可用于停止接收通知，方法是释放通知或将其传递给 RemoveObservers(IEnumerable<NSObject>)
注解
此方法可用于订阅 ContainsFragmentsDidChangeNotification 通知。
// Listen to all notifications posted for any object
var token = AVAsset.Notifications.ObserveContainsFragmentsDidChange ((notification) => {
Console.WriteLine ("Observed ContainsFragmentsDidChangeNotification!");
};
// Listen to all notifications posted for a single object
var token = AVAsset.Notifications.ObserveContainsFragmentsDidChange (objectToObserve, (notification) => {
Console.WriteLine ($"Observed ContainsFragmentsDidChangeNotification for {nameof (objectToObserve)}!");
};
// Stop listening for notifications
token.Dispose ();
适用于
ObserveContainsFragmentsDidChange(NSObject, EventHandler<NSNotificationEventArgs>)
常量的强类型通知 ContainsFragmentsDidChangeNotification 。
public static Foundation.NSObject ObserveContainsFragmentsDidChange (Foundation.NSObject objectToObserve, EventHandler<Foundation.NSNotificationEventArgs> handler);static member ObserveContainsFragmentsDidChange : Foundation.NSObject * EventHandler<Foundation.NSNotificationEventArgs> -> Foundation.NSObject参数
- objectToObserve
- NSObject
- handler
- EventHandler<NSNotificationEventArgs>
返回
令牌对象，可用于停止接收通知，方法是释放通知或将其传递给 RemoveObservers(IEnumerable<NSObject>)
注解
此方法可用于订阅 ContainsFragmentsDidChangeNotification 通知。
// Listen to all notifications posted for any object
var token = AVAsset.Notifications.ObserveContainsFragmentsDidChange ((notification) => {
Console.WriteLine ("Observed ContainsFragmentsDidChangeNotification!");
};
// Listen to all notifications posted for a single object
var token = AVAsset.Notifications.ObserveContainsFragmentsDidChange (objectToObserve, (notification) => {
Console.WriteLine ($"Observed ContainsFragmentsDidChangeNotification for {nameof (objectToObserve)}!");
};
// Stop listening for notifications
token.Dispose ();