I'm not sure if it was supported before iOS 5, but there is an API which you can use to add a subview above the keyboard view. It would be used for adding next

I'm not sure if it was supported before iOS 5, but there is an API which you can use to add a subview above the keyboard view. It would be used for adding next/previous/done buttons to help navigate forms, for example. What Textastic does appears to be a more innovative or unique example.