How to make popup like keyboard characters in iOS8 custom keyboard?

Question

I want to create popup in iOS8 custom keyboard as shown below image.

Answer 1

From the Apple App Extension Programming guide:

Finally, it is not possible to display key artwork above the top edge of a custom keyboard’s primary view, as the system keyboard does on iPhone when you tap and hold a key in the top row.

So it seems like you can't add pop-up outside the keyboard frame, so codelgnitor's answer is the best you can do.