NSExtensionContext.HostWillEnterForegroundNotification 属性

定义

命名空间:

Foundation

程序集:

Xamarin.iOS.dll

HostWillEnterForeground 的通知常量

[Foundation.Advice("Use NSExtensionContext.Notifications.ObserveHostWillEnterForeground helper method instead.")]
[Foundation.Field("NSExtensionHostWillEnterForegroundNotification", "Foundation")]
[ObjCRuntime.Introduced(ObjCRuntime.PlatformName.iOS, 8, 2, ObjCRuntime.PlatformArchitecture.All, null)]
public static Foundation.NSString HostWillEnterForegroundNotification { [ObjCRuntime.Introduced(ObjCRuntime.PlatformName.iOS, 8, 2, ObjCRuntime.PlatformArchitecture.All, null)] get; }

member this.HostWillEnterForegroundNotification : Foundation.NSString

属性值

NSString

NSString 常量应用作 NSNotificationCenter 的令牌。

属性

AdviceAttribute FieldAttribute IntroducedAttribute

注解

此常量可用于注册 NSNotificationCenter 此通知的侦听器。 这是 NSString 而不是字符串，因为这些值可以用作某些本机库中的标记，而不是纯粹用于其实际字符串内容。 回调的“notification”参数包含特定于通知类型的额外信息。

// Lambda style
NSNotificationCenter.DefaultCenter.AddObserver (
        NSExtensionContext.HostWillEnterForegroundNotification, (notification) => {Console.WriteLine ("Received the notification NSExtensionContext", notification); }


// Method style
void Callback (NSNotification notification)
{
    Console.WriteLine ("Received a notification NSExtensionContext", notification);
}

void Setup ()
{
    NSNotificationCenter.DefaultCenter.AddObserver (NSExtensionContext.HostWillEnterForegroundNotification, Callback);
}