AVAsset.DurationDidChangeNotification 屬性

定義

命名空間:

AVFoundation

組件:

Xamarin.iOS.dll

DurationDidChange 的通知常數

[Foundation.Advice("Use AVAsset.Notifications.ObserveDurationDidChange helper method instead.")]
[Foundation.Field("AVAssetDurationDidChangeNotification", "AVFoundation")]
[ObjCRuntime.Introduced(ObjCRuntime.PlatformName.iOS, 9, 0, ObjCRuntime.PlatformArchitecture.All, null)]
[ObjCRuntime.Introduced(ObjCRuntime.PlatformName.MacOSX, 10, 11, ObjCRuntime.PlatformArchitecture.All, null)]
public static Foundation.NSString DurationDidChangeNotification { [ObjCRuntime.Introduced(ObjCRuntime.PlatformName.iOS, 9, 0, ObjCRuntime.PlatformArchitecture.All, null)] [ObjCRuntime.Introduced(ObjCRuntime.PlatformName.MacOSX, 10, 11, ObjCRuntime.PlatformArchitecture.All, null)] get; }

member this.DurationDidChangeNotification : Foundation.NSString

屬性值

NSString

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

屬性

AdviceAttribute FieldAttribute IntroducedAttribute

備註

這個常數可以搭配 使用 NSNotificationCenter ，以註冊此通知的接聽程式。 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 (
        AVAsset.DurationDidChangeNotification, (notification) => {Console.WriteLine ("Received the notification AVAsset", notification); }


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

void Setup ()
{
    NSNotificationCenter.DefaultCenter.AddObserver (AVAsset.DurationDidChangeNotification, Callback);
}