重复触发本地通知会立即触发-如何推迟? [英] Repeating local notification is triggered immediately -- how to defer?

问题描述

我的目标是设置一条通知，该通知将在以后的N秒内第一次出现，然后每N秒重复一次.

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.

但是，创建重复通知似乎立即触发了 UNUserNotificationCenterDelegate .

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

应用程序代表:

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])
}

我可以通过以下方法来解决此问题:创建一个非重复的通知，然后在到期时开始重复通知.但是，我希望有某种方法可以指定第一个触发日期-如果内存可用，旧的通知API便具有此功能，也许我误会了这个新的API

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

谢谢！

推荐答案

问题可能是您没有在 UNMutableNotificationContent()上设置标题.

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

content.title = "Title goes Here"

此外，要查看添加请求是否出错，您可以添加以下代码.

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
   }
}

我是从Apple的文档中获得的- https://developer.apple.com/reference/usernotifications/unmutablenotificationcontent

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

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