Question

我希望在我的应用处于前台时收到本地通知，当我尝试使用以下代码时，它从不会触发通知，但当我在后台输入应用时，它确实被解雇了。

这是我试过的：

//Schedule a Local Notification
func ScheduleNotification(timeInterval: Double, repeats: Bool, notificationBody:String, title:String){

    let trigger = UNTimeIntervalNotificationTrigger.init(timeInterval: timeInterval, repeats: repeats)

    let center = UNUserNotificationCenter.current()

    let identifier = "UYLLocalNotification"
    let content = UNMutableNotificationContent()
    content.title = title
    content.body = notificationBody
    content.sound = UNNotificationSound.default()
    let request = UNNotificationRequest(identifier: identifier, content: content, trigger: trigger)
    center.add(request, withCompletionHandler: { (error) in
        if let error = error {
            //Something went wrong
            print(error.localizedDescription)
        }
    })
}

override func viewDidLoad() {
    super.viewDidLoad()

    if Currentcount < data.count {
        self.ScheduleNotification(timeInterval: 5.0, repeats: false, notificationBody: "You have \(data.count - Currentcount) notification", title: "Alert!")
    }
}

任何帮助将不胜感激感谢。

Answer 1

当您的应用处于前台时，通知可能也会触发。

默认情况下，当通知到达并且目标应用程序位于前台时，iOS不会显示任何UI。显示通知内容是应用程序作业。使用UNUserNotificationCenterDelegate，您可以非常轻松地将通知显示为提醒。有关详细信息，请参阅this post。

Answer 2

我在这里向您展示UNUserNotificationCenterDelegate如何逐步运作

在AppDelegate中：import UserNotifications
class AppDelegate: UIResponder,UNUserNotificationCenterDelegate{}

在 didFinishLaunchingWithOptions

中将委托方法分配给self

func application(_application:UIApplication,
didFinishLaunchingWithOptionslaunchoptions:[UIApplicationLaunchOptionsKey: Any]?) -> Bool {

       UIApplication.shared.applicationIconBadgeNumber = 0
            let center = UNUserNotificationCenter.current()
            center.delegate = self        
            center.requestAuthorization(options:[.badge, .alert, .sound]) { (granted, error) in

                if granted {
                    DispatchQueue.main.async { // Correct
                        UIApplication.shared.registerForRemoteNotifications()
                    }

                }

            }

    }

您希望在本地通知中显示的内容

     func assignValueToNotification
        {
            let content = UNMutableNotificationContent()
            content.body = "Asssign body"
            content.userInfo = ["identifier": "info"]
            content.sound = UNNotificationSound.default()
            content.badge = UIApplication.shared.applicationIconBadgeNumber + 1 as NSNumber;
            content.categoryIdentifier = "write category identifier"
            // Deliver the notification in five seconds.
            let trigger = UNTimeIntervalNotificationTrigger.init(timeInterval: 0.5, repeats: false)
            let request = UNNotificationRequest.init(identifier: region.identifier as String, content: content, trigger: trigger)
           // Schedule the notification.
           let center = UNUserNotificationCenter.current()
           center.add(request)
    }

记下您的委托方法，单击本地通知时将调用该方法。

func userNotificationCenter(_ center:UNUserNotificationCenter, didReceive response:UNNotificationResponse,withCompletionHandler completionHandler: @escaping () -> Void{
    print("Received Local Notification:")
}

Answer 3

您只需将willPresent的{{1}}委托函数添加到您的UNUserNotificationCenterDelegate。

只需将AppDelegate .sound, .banner赋予完成处理程序，您的本地通知就会在您的应用程序位于前台时显示。

UNNotificationPresentationOptions

又一步：您当然需要在extension AppDelegate: UNUserNotificationCenterDelegate { func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) { completionHandler([.sound, .banner]) } }内设置UNUserNotificationCenter委托。

didFinishLaunchingWithOptions

注意

对于SwiftUI周期，您可以像这样访问AppDelegate： Here

App位于前景Swift 4 iOS 11时获取本地通知

3 个答案:

注意