在 ViewController 中请求通知。

Question

目前，我的应用程序在首次打开时要求用户获得通知权限，当他们单击特定按钮时我如何询问他们以及当他们单击时我如何 运行 ViewController 中的 registerForRemoteNotifications单击是。以下是我的 AppDelegate 当前正在推广用户的地方。

 func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

    FirebaseApp.configure()

    UIApplication.shared.applicationIconBadgeNumber = 0

    if #available(iOS 10.0, *) {
        // For iOS 10 display notification (sent via APNS)
        UNUserNotificationCenter.current().delegate = self as? UNUserNotificationCenterDelegate

        let authOptions: UNAuthorizationOptions = [.alert, .badge, .sound]
        UNUserNotificationCenter.current().requestAuthorization(
            options: authOptions,
            completionHandler: {_, _ in })
    } else {
        let settings: UIUserNotificationSettings =
            UIUserNotificationSettings(types: [.alert, .badge, .sound], categories: nil)
        application.registerUserNotificationSettings(settings)
    }

    application.registerForRemoteNotifications()

    return true
}

Answer 1

您需要在 completionHandler 中进行设置。

这一行：UNUserNotificationCenter.current().requestAuthorization( options: authOptions, completionHandler: {_, _ in })

应该是：

UNUserNotificationCenter.current().requestAuthorization(
        options: authOptions,
        completionHandler: { granted, error in 
    if granted {
        application.registerForRemoteNotifications()
        // Do other things after user has been granted authorization
    }
})

Answer 2

将其放在 ViewController 和 运行 动作或 ViewDidLoad 中的函数中。

func registerForRemoteNotification() {
    if #available(iOS 10.0, *) {
        let center  = UNUserNotificationCenter.current()

        center.requestAuthorization(options: [.sound, .alert, .badge]) { (granted, error) in
            if error == nil{
                UIApplication.shared.registerForRemoteNotifications()
            }
        }

    }
    else {
        UIApplication.shared.registerUserNotificationSettings(UIUserNotificationSettings(types: [.sound, .alert, .badge], categories: nil))
        UIApplication.shared.registerForRemoteNotifications()
    }
}