Notification Sound is string?

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NotificationSound as a text which can play when notification come (sound will be text to speech)

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I do not know what "NotificationSound" is. But to have a notification play a sound you need to set:

        
        CKNotificationInfo *notification = [CKNotificationInfo new];
        notification.soundName= @"welcome.wav";



where "welcome.wav" is a sound file in your "Copy Bundle Resources" list under "Build Phases" for the target.