gistfile1.txt

- (void)keyboardWasShown:(NSNotification *)notification {
	CGSize keyboardSize = [[[notification userInfo] objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
	// Screen size
	CGSize screenSize = [[UIApplication sharedApplication] delegate].window.frame.size;

	// Viewport size
	CGFloat viewportHeight = screenSize.height - keyboardSize.height;
}