NSUndoManager.Notifications.ObserveDidCloseUndoGroup 方法

定义

命名空间:

Foundation

程序集:

Xamarin.iOS.dll

重载

ObserveDidCloseUndoGroup(EventHandler<NSUndoManagerCloseUndoGroupEventArgs>)	常量的强类型通知 DidCloseUndoGroupNotification 。
ObserveDidCloseUndoGroup(NSObject, EventHandler<NSUndoManagerCloseUndoGroupEventArgs>)	常量的强类型通知 DidCloseUndoGroupNotification 。

ObserveDidCloseUndoGroup(EventHandler<NSUndoManagerCloseUndoGroupEventArgs>)

常量的强类型通知 DidCloseUndoGroupNotification 。

public static Foundation.NSObject ObserveDidCloseUndoGroup (EventHandler<Foundation.NSUndoManagerCloseUndoGroupEventArgs> handler);

static member ObserveDidCloseUndoGroup : EventHandler<Foundation.NSUndoManagerCloseUndoGroupEventArgs> -> Foundation.NSObject

参数

handler

EventHandler<NSUndoManagerCloseUndoGroupEventArgs>

发布通知时调用的方法。

返回

NSObject

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

以下示例演示开发人员如何在代码中使用此方法：

//
// Lambda style
//

// listening
notification = NSUndoManager.Notifications.ObserveDidCloseUndoGroup ((sender, args) => {
    /* Access strongly typed args */
    Console.WriteLine ("Notification: {0}", args.Notification);

    Console.WriteLine ("Discardable", args.Discardable);
});

// To stop listening:
notification.Dispose ();

//
//Method style
//
NSObject notification;
void Callback (object sender, Foundation.NSUndoManagerCloseUndoGroupEventArgs args)
{
    // Access strongly typed args
    Console.WriteLine ("Notification: {0}", args.Notification);

    Console.WriteLine ("Discardable", args.Discardable);
}

void Setup ()
{
    notification = NSUndoManager.Notifications.ObserveDidCloseUndoGroup (Callback);
}

void Teardown ()
{
    notification.Dispose ();
}

ObserveDidCloseUndoGroup(NSObject, EventHandler<NSUndoManagerCloseUndoGroupEventArgs>)

常量的强类型通知 DidCloseUndoGroupNotification 。

public static Foundation.NSObject ObserveDidCloseUndoGroup (Foundation.NSObject objectToObserve, EventHandler<Foundation.NSUndoManagerCloseUndoGroupEventArgs> handler);

static member ObserveDidCloseUndoGroup : Foundation.NSObject * EventHandler<Foundation.NSUndoManagerCloseUndoGroupEventArgs> -> Foundation.NSObject

参数

objectToObserve

NSObject

要观察的对象。

handler

EventHandler<NSUndoManagerCloseUndoGroupEventArgs>

发布通知时调用的方法。

返回

NSObject

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 DidCloseUndoGroupNotification 通知。

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

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

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