UIApplication.Notifications.ObserveWillChangeStatusBarFrame 方法
定义
重要
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重载
ObserveWillChangeStatusBarFrame(EventHandler<UIStatusBarFrameChangeEventArgs>)
常量的强类型通知 WillChangeStatusBarFrameNotification 。
public static Foundation.NSObject ObserveWillChangeStatusBarFrame (EventHandler<UIKit.UIStatusBarFrameChangeEventArgs> handler);
static member ObserveWillChangeStatusBarFrame : EventHandler<UIKit.UIStatusBarFrameChangeEventArgs> -> Foundation.NSObject
参数
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
以下示例演示开发人员如何在代码中使用此方法:
//
// Lambda style
//
// listening
notification = UIApplication.Notifications.ObserveWillChangeStatusBarFrame ((sender, args) => {
/* Access strongly typed args */
Console.WriteLine ("Notification: {0}", args.Notification);
Console.WriteLine ("StatusBarFrame", args.StatusBarFrame);
});
// To stop listening:
notification.Dispose ();
//
//Method style
//
NSObject notification;
void Callback (object sender, UIKit.UIStatusBarFrameChangeEventArgs args)
{
// Access strongly typed args
Console.WriteLine ("Notification: {0}", args.Notification);
Console.WriteLine ("StatusBarFrame", args.StatusBarFrame);
}
void Setup ()
{
notification = UIApplication.Notifications.ObserveWillChangeStatusBarFrame (Callback);
}
void Teardown ()
{
notification.Dispose ();
}
适用于
ObserveWillChangeStatusBarFrame(NSObject, EventHandler<UIStatusBarFrameChangeEventArgs>)
常量的强类型通知 WillChangeStatusBarFrameNotification 。
public static Foundation.NSObject ObserveWillChangeStatusBarFrame (Foundation.NSObject objectToObserve, EventHandler<UIKit.UIStatusBarFrameChangeEventArgs> handler);
static member ObserveWillChangeStatusBarFrame : Foundation.NSObject * EventHandler<UIKit.UIStatusBarFrameChangeEventArgs> -> Foundation.NSObject
参数
- objectToObserve
- NSObject
要观察的对象。
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 WillChangeStatusBarFrameNotification 通知。
// Listen to all notifications posted for any object
var token = UIApplication.Notifications.ObserveWillChangeStatusBarFrame ((notification) => {
Console.WriteLine ("Observed WillChangeStatusBarFrameNotification!");
};
// Listen to all notifications posted for a single object
var token = UIApplication.Notifications.ObserveWillChangeStatusBarFrame (objectToObserve, (notification) => {
Console.WriteLine ($"Observed WillChangeStatusBarFrameNotification for {nameof (objectToObserve)}!");
};
// Stop listening for notifications
token.Dispose ();