nativeInterface.m

/*
  .h file
*/

#import <Foundation/Foundation.h>
#import <UserNotifications/UserNotifications.h>

@interface your_namespace_YourInterfaceImpl : NSObject<UNUserNotificationCenterDelegate> {
}

-(void)registerPush;
-(BOOL)isSupported;
@end

/*
   .m file
*/
#import "your_namespace_YourInterfaceImpl.h"
#include "your_namespace_MainClass.h" 
#include "CodenameOne_GLViewController.h" 

@implementation your_namespace_YourInterfaceImpl
  
-(BOOL)isSupported{
    return YES;
}

-(void)registerPush{ if (@available(iOS 10, *)) { 
  UNUserNotificationCenter* center = [UNUserNotificationCenter currentNotificationCenter]; 
  [center requestAuthorizationWithOptions:(UNAuthorizationOptionAlert + UNAuthorizationOptionSound + UNAuthorizationOptionBadge) completionHandler:^(BOOL granted, NSError * _Nullable error) { 
    if (granted) { 
      [[UIApplication sharedApplication] registerForRemoteNotifications]; 
    } 
  }]; 
}else { 
  UIUserNotificationType userNotificationTypes = (UIUserNotificationTypeAlert | UIUserNotificationTypeBadge | UIUserNotificationTypeSound); 
  UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:userNotificationTypes categories:nil]; 
  [[UIApplication sharedApplication] registerUserNotificationSettings:settings]; 
  [[UIApplication sharedApplication] registerForRemoteNotifications]; 
} 
}
//add below 2 voids. They aren't CN1 interface methods, just override the parent class
- (void)userNotificationCenter:(UNUserNotificationCenter *)center willPresentNotification:(UNNotification *)notification withCompletionHandler:(void (^)(UNNotificationPresentationOptions options))completionHandler {
}
- (void)userNotificationCenter:(UNUserNotificationCenter *)center didReceiveNotificationResponse:(UNNotificationResponse *)response withCompletionHandler:(void (^)())completionHandler {
}
@end