UNUserNotification在ios中即时发送通知

Question

我希望在应用程序进入后台后，每隔60秒发送一次通知。但当你进入后台时，通知是立即发送的，之后每60秒发送一次通知。我不想立即发送通知，我该怎么做？

这是我的代码，

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    // Override point for customization after application launch.
    let center = UNUserNotificationCenter.current()
    center.requestAuthorization(options: [.alert, .sound]) { (granted, error) in
        // Enable or disable features based on authorization.
    }
    return true
}

func applicationDidEnterBackground(_ application: UIApplication) {
    // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
    // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.

    let content = UNMutableNotificationContent()
    content.title = NSString.localizedUserNotificationString(forKey: "Hello,", arguments: nil)
    content.body = NSString.localizedUserNotificationString(forKey: "Some", arguments: nil)
    content.sound = UNNotificationSound.default()
    content.badge = NSNumber(value: UIApplication.shared.applicationIconBadgeNumber + 1)
    content.categoryIdentifier = "com.mahmut.localNotification"

    let trigger = UNTimeIntervalNotificationTrigger.init(timeInterval: 60.0, repeats: true)
    let request = UNNotificationRequest.init(identifier: "60Sec", content: content, trigger: trigger)

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

}

Answer 1

试着这样使用它...你可以利用你自己的时间而不是4小时。稍后，在您的函数中，您可以使用计时器概念每隔60秒发送一次通知。

    let triggerTime = (Int64(NSEC_PER_SEC) * 4)
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, triggerTime), dispatch_get_main_queue(), { () -> Void in
        self.callYourFunction() 
    })