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UIView.ClosedCaptioningStatusDidChangeNotification 属性

  • 参考

定义

命名空间:
UIKit
程序集:
Xamarin.iOS.dll

ClosedCaptioningStatusDidChange 的通知常量

[Foundation.Advice("Use UIView.Notifications.ObserveClosedCaptioningStatusDidChange helper method instead.")]
[Foundation.Field("UIAccessibilityClosedCaptioningStatusDidChangeNotification", "UIKit")]
[ObjCRuntime.Unavailable(ObjCRuntime.PlatformName.WatchOS, ObjCRuntime.PlatformArchitecture.All, null)]
public static Foundation.NSString ClosedCaptioningStatusDidChangeNotification { [ObjCRuntime.Unavailable(ObjCRuntime.PlatformName.WatchOS, ObjCRuntime.PlatformArchitecture.All, null)] get; }
member this.ClosedCaptioningStatusDidChangeNotification : Foundation.NSString

属性值

NSString

NSString 常量应用作 NSNotificationCenter 的令牌。

属性
AdviceAttribute FieldAttribute UnavailableAttribute

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 (
    UIView.ClosedCaptioningStatusDidChangeNotification, (notification) => {
        Console.WriteLine ("Received the notification UIView", notification); 
    });

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

void Setup ()
{
    NSNotificationCenter.DefaultCenter.AddObserver (UIView.ClosedCaptioningStatusDidChangeNotification, Callback);
}

适用于

另请参阅