Question

I am a newbie to IPHONE development. I am facing a issue in working with NSNotification with multithreading.

I have a few images in a gallery.I select the image. Selected images get stored in core data.I have a button (upload). When i click on it i need to show a hud with a NSNotification saying (Uploading with image name). ie. “uploading image1.jpg” then i need to call the next thread to display “uploading image2.jpg” and so on. I need a sample code for this.

I need to know how to send and receive NSNotification with multithreading. Kindly help me in this issue.

Thanks in advance.

Answer 1

Consider using MBProgressHUD for this.

The demo project include examples very similar to what you’re doing.
The components also has other feature you may want, like a progress indicator.

From the main page, configuring an async task to have a HUD notification is as simple as:

[MBProgressHUD showHUDAddedTo:self.view animated:YES];
dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{
    // Do something...
    dispatch_async(dispatch_get_main_queue(), ^{
        [MBProgressHUD hideHUDForView:self.view animated:YES];
    });
});