What to do if you use an action method and Xcode tells you that it's undeclared ?

Question

This is what I wrote ( the code lines with errors in them are highlighted red and the errors themself are highlighted orange ) :
- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
  if (interfaceOrientation == UIInterfaceOrientationPortrait) { < 'interfaceOrientation" undeclared
                    self.view = self.portrait;
  self.view.transform = CGAffineTransformIdentity;
  self.view.transform = CGAffineTransformMakeRotation(degreesToRadiants(0));
                    self.view.bounds = CGRectMake (0.0, 0.0, 320.0, 460.0);
  else if (interfaceOrientation == UIInterfaceOrientationLandscapeLeft) {
  self.view = self.landscape;
  self.view.transform = CGAffineTransformIdentity;
  self.view.transform = CGAffineTransformMakeRotation(degreesToRadiants (-90));
                    self.view.bounds = CGRectMake(0.0, 0.0, 380.0, 300.0);
  else if (interfaceOrientation == UIInterfaceOrientationPortraitUpsideDown) {
                    self.view = self.portrait;
  self.view.transform = CGAffineTransformIdentity;
  self.view.transform = CGAffineTransformMakeRotation(degreesToRadiants (180));
                    self.view.bounds = CGRectMake(0.0, 0.0, 320.0, 460.0);
  else if (interfaceOrientation == UIInterfaceOrientationLandscapeRight) {
                    self.view = self.portrait;
  self.view.transform = CGAffineTransformIdentity;
  self.view.transform = CGAffineTransformMakeRotation(degreesToRadiants (90));
                    self.view.bounds = CGRectMake(0.0, 0.0, 480.0, 300.0);
          - (IBAction)buttonPressed:(id)sender {    < 'buttonPressed' undeclared expected ';' before ':' token
  if (sender == portraitFooButton || sender landscapeFooButton)
  portraitFooButton.hidden = YES:
  landscapeFooButton.hidden = YES;
          } else {
  portraitBarButton.hidden = YES;
  landscapeBarButton.hidden = YES;
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)InterfaceOrientation {
  return YES;

Answer 1

You have declared toInterfaceOrientation and are attempting to use it as interfaceOrientation