iOS Question UserNotificationCenter - Trigger notification without alert

[Alexander Stolte]

UserNotificationCenter class

A class that creates local notifications based on the newer iOS 10+ API. The notifications are configured to show even when the app is in the foreground. You can also add actions to the notifications: See the attached example

www.b4x.com

I would like to display a notification without the popup appearing (without an alert). According to Apple's documentation, I can do this with the “UNNotificationPresentationOptionNone” option. How can I use this with the UserNotificationCenter class?

UNNotificationPresentationOptionNone | Apple Developer Documentation

No alert.

developer.apple.com

[CODE lang="b4x" title="From the UserNotificationCenter class"]Public Sub CreateNotificationWithContent(Title As String, Body As String, Identifier As String, Category As String, MillisecondsFromNow As Long)
Dim ln As NativeObject
ln = ln.Initialize("UNMutableNotificationContent").RunMethod("new", Null)
ln.SetField("title", Title)
ln.SetField("body", Body)
Dim n As NativeObject
ln.SetField("sound", n.Initialize("UNNotificationSound").RunMethod("defaultSound", Null))
If Category <> "" Then ln.SetField("categoryIdentifier", Category)
Dim trigger As NativeObject
trigger = trigger.Initialize("UNTimeIntervalNotificationTrigger").RunMethod("triggerWithTimeInterval:repeats:", Array(MillisecondsFromNow / 1000, False))
Dim request As NativeObject
request = request.Initialize("UNNotificationRequest").RunMethod("requestWithIdentifier:content:trigger:", _
Array(Identifier, ln, trigger))
Dim NotificationCenter As NativeObject
NotificationCenter = NotificationCenter.Initialize("UNUserNotificationCenter").RunMethod("currentNotificationCenter", Null)
NotificationCenter.RunMethod("addNotificationRequest:", Array(request))
End Sub

#if OBJC
#import <UserNotifications/UserNotifications.h>
@end
@interface b4i_usernotificationcenter (notification) <UNUserNotificationCenterDelegate>
@end
@implementation b4i_usernotificationcenter (notification)
- (void)userNotificationCenterUNUserNotificationCenter *)center
willPresentNotificationUNNotification *)notification
withCompletionHandlervoid (^)(UNNotificationPresentationOptions options))completionHandler {
completionHandler(UNNotificationPresentationOptionAlert | UNNotificationPresentationOptionSound );
}
- (void)userNotificationCenterUNUserNotificationCenter *)center
didReceiveNotificationResponseUNNotificationResponse *)response
withCompletionHandlervoid (^)(void))completionHandler {
B4I* bi = [b4i_main new].bi;
[bi raiseEvent:nil event"usernotification_action:" params[response]];
completionHandler();
}
#End If[/CODE]

Thanks

 

[Erel]

The option is set on this OBJC line:
completionHandler(UNNotificationPresentationOptionAlert | UNNotificationPresentationOptionSound )

So it should be:

completionHandler(UNNotificationPresentationOptionNone)

[/code][/SIZE]

 

[Alexander Stolte]

Thank you very much, but somehow it doesn't seem to work. No notification is displayed in the notification center. Or am I misunderstanding the function?

#if OBJC
#import <UserNotifications/UserNotifications.h>
@end
@interface b4i_usernotificationcenter (notification) <UNUserNotificationCenterDelegate>
@end
@implementation b4i_usernotificationcenter (notification)
- (void)userNotificationCenter:(UNUserNotificationCenter *)center
       willPresentNotification:(UNNotification *)notification
         withCompletionHandler:(void (^)(UNNotificationPresentationOptions options))completionHandler {
        completionHandler(UNNotificationPresentationOptionNone);
   }
 - (void)userNotificationCenter:(UNUserNotificationCenter *)center
didReceiveNotificationResponse:(UNNotificationResponse *)response
         withCompletionHandler:(void (^)(void))completionHandler {
       B4I* bi = [b4i_main new].bi;
[bi raiseEvent:nil event:@"usernotification_action:" params:@[response]];
completionHandler();
   }
#End If

 

[Alexander Stolte]

This is the solution:

completionHandler(UNNotificationPresentationOptionNone | UNNotificationPresentationOptionList );

we need to add UNNotificationPresentationOptionList too.

btw: The UNNotificationPresentationOptionAlert is Deprecated since ios 14

alert | Apple Developer Documentation

Display the alert using the content provided by the notification.

developer.apple.com