UIToolbar-Keyboard-Example is a project mainly written in OBJECTIVE-C and C, it's free.
A sample app showing how to have a transparent UIToolbar that floats above the keyboard
This is a sample application showing how to have a UIToolbar that looks like it's "floating" above the keyboard. Useful for multi-line editing and chat style applications.
Read this blog post for more information: http://www.iosdevnotes.com/index.php/2011/02/iphone-keyboard-toolbar/.