Repeating local notification is triggered immediately — how to defer?

问题

My goal is to set a notification that will occur N seconds in the future for the first time, and then repeat every N seconds.

However, creating a repeating notification seems to trigger the UNUserNotificationCenterDelegate immediately.

App delegate:

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    let center = UNUserNotificationCenter.current()
    center.delegate = self
    return true
}

func startRequest() {
    let content = UNMutableNotificationContent()
    content.body = bodyText
    content.categoryIdentifier = categoryIdentifier
    content.sound = UNNotificationSound.default()

    let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 60, repeats: true)
    trigger.nextTriggerDate()
    let request = UNNotificationRequest(identifier: UUID().uuidString, content: content, trigger: trigger)

    let center = UNUserNotificationCenter.current()
    center.add(request)
}

func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
    // This callback received right after the request is made
    completionHandler([.alert, .sound])
}

I can work around this by creating a non-repeating notification and then starting repeating notifications when it expires. However, I was hoping there was some way to specify a first trigger date -- if memory serves right, the old notification API had this ability, and perhaps I am misunderstanding this new API

Thanks!

回答1:

The issue may be that you aren't setting the title on the UNMutableNotificationContent().

content.title = "Title goes Here"

Also, to see if there is an error adding the request, you can add the following code.

center.add(request) { (error : Error?) in
   if let theError = error {
     // Handle any errors
   }
}

I got this from Apple's docs - https://developer.apple.com/reference/usernotifications/unmutablenotificationcontent

来源：https://stackoverflow.com/questions/41768342/repeating-local-notification-is-triggered-immediately-how-to-defer

标签

ios

swift

notifications

ios10