如何在请求权限后检查UNNotifications是否已启用？

Question

目前，我有下面的代码，基本上是要求用户许可发送通知，然后检查是否启用通知：

UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .badge, .sound], completionHandler: { (granted, error) in 
     if granted { 

     } else { 

     } 
    }) 

    let notifType = UIApplication.shared.currentUserNotificationSettings?.types 
    if notifType?.rawValue == 0 { 
     print("being called") 
     let alert = UIAlertController(title: "Notifications are disabled for this app.", message: "Please enable notifications for the app to work properly. This can be done by going to Settings > Notifications > NAME HERE and allow notifications.", preferredStyle: UIAlertControllerStyle.alert) 
     alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.cancel, handler: nil)) 
     show(alert, sender: self) 
    } else { 
     //enabled 
    } 

代码工作，如果启用通知然而，它检查然后用户可以选择“是”或“否”。因此，无论选择什么，弹出对话框。有没有一种方法可以等待用户选择“是”还是“否”之前检查授权状态？

Answer 1

您可以将检查到的回调，所以授权首先检查：

UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .badge, .sound], completionHandler: { (granted, error) in 
    if (granted) { 
     // Alert here 
    } else { 
     // Or here 
    } 
})