@kaojinz

#pragma mark - Flip screen

- (void)flipAction:(id)sender

{

[UIView setAnimationDelegate:self];

[UIView setAnimationDidStopSelector:@selector

            (animationDidStop:animationIDfinished:finished:context:)];

[UIView beginAnimations:nil context:nil];

[UIView setAnimationDuration:0.75];

[UIView setAnimationTransition:([self.tableView superview] ? UIViewAnimationTransitionFlipFromLeft UIViewAnimationTransitionFlipFromRight)

forView:self.tableView cache:YES];

if ([instructionsView superview])

[instructionsView removeFromSuperview];

else

[self.tableView addSubview:instructionsView];

[UIView commitAnimations];

// adjust our done/info buttons accordingly

if ([instructionsView superview] == self.tableView)

self.navigationItem.rightBarButtonItem = doneButton;

else

self.navigationItem.rightBarButtonItem = flipButton;

}