如何重置通知类型？

Question

我曾经使用下面的代码注册我的通知。

let settings = UIUserNotificationSettings(forTypes: [.Alert, .Sound, .Badge], categories: UIApplication.sharedApplication().currentUserNotificationSettings()?.categories)
UIApplication.sharedApplication().registerUserNotificationSettings(settings)

现在我要取消.Sound通知类型。好像我不能用

let settings = UIUserNotificationSettings(forTypes: [.Alert, .Badge], categories: UIApplication.sharedApplication().currentUserNotificationSettings()?.categories)
UIApplication.sharedApplication().registerUserNotificationSettings(settings)

这样做。关闭我的远程通知声音的任何解决方案？