应用程序关闭时如何发送本地通知（swift）？

Question

我有一个数据库，其中存储有过期日期的产品。当到期日期到期时，用户应该会收到有关此的通知。但是如果用户关闭了他们的应用程序（杀死应用程序），这些通知也应该出现。问题：如何做到这一点？请给我看代码。 我的代码是（AppDelegate）：

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

    let center = UNUserNotificationCenter.current()
    center.requestAuthorization(options: [.alert, .sound]) { (granted, error) in }

    return true
}

和（视图控制器）：

    let center = UNUserNotificationCenter.current()

    let content = UNMutableNotificationContent()
    content.title = "title"
    content.body = "\(overdueProductsStringArray)"
    content.sound = UNNotificationSound.default()

    let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 5, repeats: false)
    let request = UNNotificationRequest(identifier: "t", content: content, trigger: trigger)

    center.add(request, withCompletionHandler: nil)

Answer 1

如果你去 AppDelegate 有一个名为 applicationWillTerminate 的方法，所以你只需要调用你的方法来发送位置。

func applicationWillTerminate(_ application: UIApplication) {
    // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.

    let viewControllerWithYourFunction = ViewControllerWithYourFunction()
    viewControllerWithYourFunction.sendLocation()
}

Answer 2

didFinishWithLaunchOptions

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

     if let launchOptions = launchOptions,
            let userInfo =  launchOptions[.remoteNotification] as? [AnyHashable: Any] {
            //some code here and post when needed like below
            NotificationCenter.default.post(name: NSNotification.Name("your notification name"),  object: nil)
        }
}