UIApplication.Notifications.ObserveProtectedDataDidBecomeAvailable 方法
定义
重要
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重载
ObserveProtectedDataDidBecomeAvailable(NSObject, EventHandler<NSNotificationEventArgs>)
public static Foundation.NSObject ObserveProtectedDataDidBecomeAvailable(Foundation.NSObject objectToObserve, EventHandler<Foundation.NSNotificationEventArgs> handler);static member ObserveProtectedDataDidBecomeAvailable : Foundation.NSObject * EventHandler<Foundation.NSNotificationEventArgs> -> Foundation.NSObject参数
- objectToObserve
- NSObject
要观察的对象。
- handler
- EventHandler<NSNotificationEventArgs>
发布通知时调用的方法。
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 P：UIKit.UIApplication.ProtectedDataDidBecomeAvailableNotification 通知。
// Listen to all notifications posted for any object
var token = UIApplication.Notifications.ObserveProtectedDataDidBecomeAvailable ((notification) => {
Console.WriteLine ("Observed ProtectedDataDidBecomeAvailableNotification!");
};
// Listen to all notifications posted for a single object
var token = UIApplication.Notifications.ObserveProtectedDataDidBecomeAvailable (objectToObserve, (notification) => {
Console.WriteLine ($"Observed ProtectedDataDidBecomeAvailableNotification for {nameof (objectToObserve)}!");
};
// Stop listening for notifications
token.Dispose ();
适用于
ObserveProtectedDataDidBecomeAvailable(EventHandler<NSNotificationEventArgs>)
public static Foundation.NSObject ObserveProtectedDataDidBecomeAvailable(EventHandler<Foundation.NSNotificationEventArgs> handler);static member ObserveProtectedDataDidBecomeAvailable : EventHandler<Foundation.NSNotificationEventArgs> -> Foundation.NSObject参数
- handler
- EventHandler<NSNotificationEventArgs>
发布通知时调用的方法。
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
以下示例演示如何在代码中使用此方法
//
// Lambda style
//
// listening
notification = UIApplication.Notifications.ObserveProtectedDataDidBecomeAvailable ((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 = UIApplication.Notifications.ObserveProtectedDataDidBecomeAvailable (Callback);
}
void Teardown ()
{
notification.Dispose ();
}