UIImage.Notifications.ObserveUnfocusedElementKey 方法

定义

命名空间:

UIKit

程序集:

Xamarin.iOS.dll

重载

ObserveUnfocusedElementKey(EventHandler<NSNotificationEventArgs>)	P：UIKit.UIImage.UnfocusedElementKeyNotification 常量的强类型通知。
ObserveUnfocusedElementKey(NSObject, EventHandler<NSNotificationEventArgs>)	P：UIKit.UIImage.UnfocusedElementKeyNotification 常量的强类型通知。

ObserveUnfocusedElementKey(EventHandler<NSNotificationEventArgs>)

P：UIKit.UIImage.UnfocusedElementKeyNotification 常量的强类型通知。

public static Foundation.NSObject ObserveUnfocusedElementKey (EventHandler<Foundation.NSNotificationEventArgs> handler);

static member ObserveUnfocusedElementKey : EventHandler<Foundation.NSNotificationEventArgs> -> Foundation.NSObject

参数

handler

EventHandler<NSNotificationEventArgs>

发布通知时调用的方法。

返回

NSObject

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.UIImage.UnfocusedElementKeyNotification 通知。

// Listen to all notifications posted for any object
var token = UIImage.Notifications.ObserveUnfocusedElementKey ((notification) => {
	Console.WriteLine ("Observed UnfocusedElementKeyNotification!");
};

// Listen to all notifications posted for a single object
var token = UIImage.Notifications.ObserveUnfocusedElementKey (objectToObserve, (notification) => {
	Console.WriteLine ($"Observed UnfocusedElementKeyNotification for {nameof (objectToObserve)}!");
};

// Stop listening for notifications
token.Dispose ();

ObserveUnfocusedElementKey(NSObject, EventHandler<NSNotificationEventArgs>)

P：UIKit.UIImage.UnfocusedElementKeyNotification 常量的强类型通知。

public static Foundation.NSObject ObserveUnfocusedElementKey (Foundation.NSObject objectToObserve, EventHandler<Foundation.NSNotificationEventArgs> handler);

static member ObserveUnfocusedElementKey : 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

NSObject

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.UIImage.UnfocusedElementKeyNotification 通知。

// Listen to all notifications posted for any object
var token = UIImage.Notifications.ObserveUnfocusedElementKey ((notification) => {
	Console.WriteLine ("Observed UnfocusedElementKeyNotification!");
};

// Listen to all notifications posted for a single object
var token = UIImage.Notifications.ObserveUnfocusedElementKey (objectToObserve, (notification) => {
	Console.WriteLine ($"Observed UnfocusedElementKeyNotification for {nameof (objectToObserve)}!");
};

// Stop listening for notifications
token.Dispose ();