Sbuscription 的创建如下。可以用，但是没有声音，为什么？医生说：if you specify the string default for this property, the system plays the default alert sound.
let s2 = CKSubscription(recordType: recordType, predicate: NSPredicate(format: "destination = %@", CKReference(recordID: CKRecordID(recordName: loggedInUserSettingRecordName!), action: .DeleteSelf)), options: .FiresOnRecordCreation)
s2.notificationInfo = CKNotificationInfo()
s2.notificationInfo.alertBody = " "
s2.notificationInfo.soundName = "default"
subscriptionsToSave.append(s2)
s2.notificationInfo.soundName = UILocalNotificationDefaultSoundName
也不行
需要更新registerUserNotificationSettings方法调用也是如此。
UIApplication.sharedApplication().registerUserNotificationSettings(UIUserNotificationSettings(forTypes: .Sound | .Alert, categories: nil))
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