How to show User notification twice on single button click using NSUserNotification?

Question

Let me first describe the scenario then I will describe the issue:

I have created a function that shows a user notification using NSUserNotification

    -(void)notify:(NSString*) message {

    NSUserNotification *notification = [[NSUserNotification alloc] init];
    notification.title = @"TechHeal";
    notification.informativeText = message;
    //notification.soundName = NSUserNotificationDefaultSoundName;

    [[NSUserNotificationCenter defaultUserNotificationCenter] deliverNotification:notification];    
}

I have a button the fetches details from the server. At the begening and at the end of the button click I have called the notification as shown below:

-(IBAction)get2000Rows:(id)sender{

    [self notify:@"Please wait..."];

    //some code that takes a while to run. like 10 minues :P

    [self notify:@"Thanks for waiting..."];

}

Now, the issue is that the first notification "Please wait..." is not getting shown on the button click however the last notification is showing perfectly.

I also tried to call Notify function in a seprate thread but it did not worked as well. (Shown Below)

dispatch_queue_t backgroundQueue = dispatch_queue_create("com.mycompany.myqueue", 0);

    dispatch_async(backgroundQueue, ^{

        [self notify:@"Please wait..."];


        dispatch_async(dispatch_get_main_queue(), ^{
        });    
    });

Your help is really appreciated. Thank you in advance.

Answer 1

The problem is that you run your 10 minutes code on the same thread as the UI part of the code. So you should separate those using this:

-(IBAction)get2000Rows:(id)sender{

    [self notify:@"Please wait..."];

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

        //some code that takes a while to run. like 10 minues :P

        dispatch_async(dispatch_get_main_queue(), ^(void) {
            [self notify:@"Thanks for waiting..."];
        });
    });
}

Answer 2

You can start the timer through NSTimer for remessage

@interface MyClass ()
{
     NSTimer *timer;
}

-(IBAction)get2000Rows:(id)sender{

       [self notify:@"Please wait..."];


       timer = [NSTimer scheduledTimerWithTimeInterval:10.0f
                                                target:self
                                            selector:@selector(timerClick:)
                                            userInfo:nil
                                             repeats:YES];
}

 - (void)timerClick:(NSTimer *)timer {

        [self notify:@"Thanks for waiting..."];
 }