`willPresent notification` isn't called & local notifications aren't not showing up when the app is in the foreground in iOS 10

Question

When I first run my app the simulator is able to display notifications whilst the app is in the foreground.

When I relaunch the app didReceive notification: (i.e. notification method from iOS 9) is called instead of willPresent notification (i.e. notification method from iOS 10) and no notifications are displayed whilst the app is in the foreground. However, a notification is displayed if the app is in the background.

Neither this question or this question provided a solution to this problem.

I get authorisation for notifications using this code:

func application(_ application: UIApplication, willFinishLaunchingWithOptions launchOptions: [NSObject : AnyObject]? = [:]) -> Bool {
                if #available(iOS 10.0, *) {
                    let center = UNUserNotificationCenter.current() 
                    center.requestAuthorization(options: [.alert, .sound,  .sound]) { (granted, error) in              
                    UNUserNotificationCenter.current().delegate = self                   
                    }                      
                }
                return true
            }

And I've implemented the willPresent notification method:

@available(iOS 10.0, *)
            func userNotificationCenter(_ center: UNUserNotificationCenter,
                                        willPresent notification: UNNotification,
                                        withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void)                     completionHandler(UNNotificationPresentationOptions.alert)
            }

Here's how I create the notification:

let content = UNMutableNotificationContent()
        content.title = title
        content.subtitle = subtitle
        content.body = message
        content.categoryIdentifier = identifier                      

        let trigger = UNTimeIntervalNotificationTrigger(
            timeInterval: 10.0,
            repeats: false)

        let request = UNNotificationRequest(
            identifier: "identifier",
            content: content,
            trigger: trigger
        )

        UNUserNotificationCenter.current().add(
            request, withCompletionHandler: nil)

Problem in a nutshell: How do I ensure the app is able to display a notification when the app is in the foreground after the first time that the app is run?

Thanks in advance.

It is because the identifier is same for all the notifications. make sure you add different identifiers for different notifications. Also, why are you asking for `.sound` two times in permission? — bhakti123, Feb 02 '17 at 13:50

Jerry · Answer 1 · 2016-10-29T18:16:33.487

3

Try setting the delegate outside of the requestAuthorization completion block. It's probably happening later than you want.

I added a sample project here: https://github.com/jerbeers/DemoLocalNotification

If you build and run, tap the button, you'll see the local notification 3 seconds later. If you stop, build and run again, I see the local notification even while the app is running.

edited Oct 29 '16 at 18:16

answered Oct 19 '16 at 22:14

Jerry

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Thanks for your response. I tried setting the delegate both before and after the requestAuthorization completion block and it didn't solve the issue. Can you suggest any other solutions? – Micah Simmons Oct 28 '16 at 23:54
Tell me the steps you're taking. When you say "first run" and "relaunch", what specifically are you doing? – Jerry Oct 29 '16 at 03:49
By first run I mean; the first time I `install` the app, and by `relaunch` I mean; when I reload the app via Xcode in the simulator after it has been installed. – Micah Simmons Oct 29 '16 at 17:54
How are you installing the app? From TestFlight or from Xcode, or what? – Jerry Oct 29 '16 at 17:58
I'm installing the app using Xcode, I'm not currently using TestFlight. – Micah Simmons Oct 29 '16 at 17:59
So, you build and run, tap a button or something, and the app shows local notifications. You stop in Xcode, build and run again, tap the button, and it doesn't? – Jerry Oct 29 '16 at 18:01
It's basically that scenario. In essence, I install the app, create a local notification and the notification displays whilst the app is in the foreground. Then when I relaunch the app without changing any code and create a local notification in the same way the local notification will only display once the app is no-longer in the foreground. – Micah Simmons Oct 29 '16 at 18:06

`willPresent notification` isn't called & local notifications aren't not showing up when the app is in the foreground in iOS 10

1 Answers1