是否可以在获得初始权限后向UIUserNotificationCategory添加新操作

Question

背景

• 我有一个iOS消息应用程序，已有一个已安装的用户群
• 我已经向用户请求/获得了系统级通知权限(也就是说，我用类别/操作调用了UIApplication.sharedApplication().registerUserNotificationSettings(
• iOS 9在UIMutableUserNotificationAction上提供了一个名为behavior的新属性，该属性允许通过.TextInput选项进行在线回复

问题

iOS 9发布后，我想"升级"我的用户，并在推送通知上支持这个新的"在线回复"选项。。。但显然，我首先需要向每个用户的UIApplication.sharedApplication().currentUserNotificationSettings() 添加一个新的UIMutableUserNotificationAction(具有新的行为属性(

问题

由于我已经拥有一般通知权限(徽章/声音/警报(，我可以安静地重新执行UIApplication.sharedApplication().registerUserNotificationSettings并添加新的"在线回复"操作吗？

Answer 1

事实证明，您不能简单地调用UIApplication.sharedApplication().registerUserNotificationSettings并添加单个新操作——这样做将只注册单个新操作(并删除所有其他操作(。

以下是我在application: didFinishLaunchingWithOptions:中完成的操作

注意：我使用count < 2的逻辑检查，因为在我的应用程序的以前版本中，我只在目标类别("REPLY_category"(中建立了一个操作。

// 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>)))
        }
      }
    }
  }
}