UIView.VoiceOverStatusDidChangeNotification 屬性

定義

命名空間:

UIKit

組件:

Xamarin.iOS.dll

VoiceOverStatusDidChange 的通知常數

[Foundation.Advice("Use UIView.Notifications.ObserveVoiceOverStatusDidChange helper method instead.")]
[Foundation.Field("UIAccessibilityVoiceOverStatusDidChangeNotification", "UIKit")]
[ObjCRuntime.Introduced(ObjCRuntime.PlatformName.TvOS, 11, 0, ObjCRuntime.PlatformArchitecture.All, null)]
[ObjCRuntime.Introduced(ObjCRuntime.PlatformName.iOS, 11, 0, ObjCRuntime.PlatformArchitecture.All, null)]
[ObjCRuntime.Unavailable(ObjCRuntime.PlatformName.WatchOS, ObjCRuntime.PlatformArchitecture.All, null)]
public static Foundation.NSString VoiceOverStatusDidChangeNotification { [ObjCRuntime.Introduced(ObjCRuntime.PlatformName.TvOS, 11, 0, ObjCRuntime.PlatformArchitecture.All, null)] [ObjCRuntime.Introduced(ObjCRuntime.PlatformName.iOS, 11, 0, ObjCRuntime.PlatformArchitecture.All, null)] [ObjCRuntime.Unavailable(ObjCRuntime.PlatformName.WatchOS, ObjCRuntime.PlatformArchitecture.All, null)] get; }

member this.VoiceOverStatusDidChangeNotification : Foundation.NSString

屬性值

NSString

NSString 常數應該用來做為 NSNotificationCenter 的權杖。

屬性

AdviceAttribute FieldAttribute IntroducedAttribute UnavailableAttribute

備註

這個常數可以搭配 NSNotificationCenter 使用 來註冊此通知的接聽程式，而開發人員也可以改用強型別通知 ObserveVoiceOverStatusDidChange 。 這是 NSString 而非字串，因為這些值可以當做某些原生程式庫中的權杖使用，而不是單純用於其實際字串內容。 回呼的 'notification' 參數包含通知類型特有的額外資訊。

// Lambda style
NSNotificationCenter.DefaultCenter.AddObserver (
        UIView.VoiceOverStatusDidChangeNotification, (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.VoiceOverStatusDidChangeNotification, Callback);
}