Showing a popup message to a user in iOS is not very difficult. The code below shows a popup message with 1 button. If the user presses the button the popup message disappears. No code is executed when the uses pushes the button. (For an example with delegates look at the post: “Popup message in iOS with delegate”)

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  UIAlertView *message = [[UIAlertView alloc] initWithTitle:@"Alert title"
                                                    message:@"Alert body"
                                                   delegate:nil
                                          cancelButtonTitle:@"OK"
                                          otherButtonTitles:nil];
  [message show];
  [message release];

Some more explanation:

• Line 1: a UIAlertview is allocated. We alloc-ed the UIAlertView, therefore we are responsible for releasing it. (See the post on memory management for more info)
• Line 1 and 2: The title and body of the popup message is set here.
• Line 3: There is no “delegate” in this example, just 1 button to press therefore no response to this 1 button.
• Line 4: The title of the button that makes the popup message disappear is set here
• Line 5: There are no other buttons.
• Line 6: Show the popup message!
• Line 7: remember line 1, we are responsible for releasing the UIAlertView, that’s just what we do here.

With this code example the popup should look like: