UIApplication.Notifications.ObserveDidChangeStatusBarFrame 方法
定义
重要
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重载
ObserveDidChangeStatusBarFrame(EventHandler<UIStatusBarFrameChangeEventArgs>)
常量的强类型通知 DidChangeStatusBarFrameNotification 。
public static Foundation.NSObject ObserveDidChangeStatusBarFrame (EventHandler<UIKit.UIStatusBarFrameChangeEventArgs> handler);static member ObserveDidChangeStatusBarFrame : 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 = UIApplication.Notifications.ObserveDidChangeStatusBarFrame ((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.ObserveDidChangeStatusBarFrame (Callback);
}
void Teardown ()
{
notification.Dispose ();
}
适用于
ObserveDidChangeStatusBarFrame(NSObject, EventHandler<UIStatusBarFrameChangeEventArgs>)
常量的强类型通知 DidChangeStatusBarFrameNotification 。
public static Foundation.NSObject ObserveDidChangeStatusBarFrame (Foundation.NSObject objectToObserve, EventHandler<UIKit.UIStatusBarFrameChangeEventArgs> handler);static member ObserveDidChangeStatusBarFrame : 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 DidChangeStatusBarFrameNotification 通知。
// Listen to all notifications posted for any object
var token = UIApplication.Notifications.ObserveDidChangeStatusBarFrame ((notification) => {
Console.WriteLine ("Observed DidChangeStatusBarFrameNotification!");
};
// Listen to all notifications posted for a single object
var token = UIApplication.Notifications.ObserveDidChangeStatusBarFrame (objectToObserve, (notification) => {
Console.WriteLine ($"Observed DidChangeStatusBarFrameNotification for {nameof (objectToObserve)}!");
};
// Stop listening for notifications
token.Dispose ();