在獲得初始許可後，是否可以將新操作添加到UIUserNotificationCategory？

Question

背景

• 我有一個現有的，已安裝的用戶羣在iOS消息傳遞應用程序。
• 我已經向用戶詢問/獲得了系統級別的通知權限（也就是我稱之爲UIApplication.sharedApplication().registerUserNotificationSettings的類別/操作）。
• iOS 9 offers a new property on UIMutableUserNotificationAction called behavior which allows for in-line replies via the .TextInput option.

問題

在iOS版9的發佈，我想「升級」我的用戶和支持推送通知這個新的「在線回覆」選項...但很明顯，我首先需要添加新UIMutableUserNotificationAction（用新的行爲屬性）到每個用戶的UIApplication.sharedApplication().currentUserNotificationSettings()

問題

因爲我已經有一般權限的通知（徽章/聲音/警報），我能，悄悄重新執行UIApplication.sharedApplication().registerUserNotificationSettings並添加新的「在線回覆」行動？

Answer 1

事實證明，你不能簡單地打電話UIApplication.sharedApplication().registerUserNotificationSettings並添加一個新的行動 - 這樣做將註冊只有單一的，新的行動（並吹走你所有的其他人）。

這裏就是我最後做的application: didFinishLaunchingWithOptions：

注：我用的count < 2邏輯檢查，因爲在以前的版本我的應用程序，我只建立在目標類別（「REPLY_CATEGORY」一個行動）。

// This code ensures that iOS 9 Users (especially iOS 8 ==> iOS 9 upgraders) will be able to see 
// iOS 9's new text input 'behavior', available for notifications quick-actions 
if #available(iOS 9, *) { 
    if NSUserDefaults.standardUserDefaults().boolForKey("asked_for_notification_permission") { 
    let settings: UIUserNotificationSettings = UIApplication.sharedApplication().currentUserNotificationSettings()! 

    for category in settings.categories! { 
     let cat: UIUserNotificationCategory = category 
     if cat.identifier == "REPLY_CATEGORY" { 
     if cat.actionsForContext(UIUserNotificationActionContext.Default)!.count < 2 { 
      print("! aD: iOS 9 User has less than the expected reply actions") 

      // Re-build entire categories/actions here, including 
      // the new action with .behavior = .TextInput 
      // THEN, simply re-register: 

      let notificationCategories = NSSet(array: allCategories) 
      let settings: UIUserNotificationType = [.Sound, .Alert, .Badge] 

      UIApplication.sharedApplication().registerUserNotificationSettings(UIUserNotificationSettings(forTypes: settings, categories: (notificationCategories as! Set<UIUserNotificationCategory>))) 

     } 
     } 
    } 
    } 
}