NavigationBarに置いたUISegmentedControlのインスタンスを水平回転

gistfile1.m

- (void)addNavigationBarButton {
  // 黒色のNavigationBarに黒色のボタンの場合
  // setmentedControlObjectがメンバー変数としてあること
  NSArray *controlItems                        = [NSArray arrayWithObjects:@"BBB", nil];
  segmentedControlObject                       = [[UISegmentedControl alloc] initWithItems:controlItems];
  segmentedControlObject.momentary             = YES;
  segmentedControlObject.segmentedControlStyle = UISegmentedControlStyleBar;
  segmentedControlObject.tintColor             = [UIColor darkGrayColor];
  [segmentedControlObject addTarget:self action:@selector(flipNavigationBarButton) forControlEvents:UIControlEventValueChanged];
  UIBarButtonItem *button                      = [[UIBarButtonItem alloc] initWithCustomView:segmentedControlObject];
  self.navigationItem.rightBarButtonItem       = button;
  [button release];
 }
}

- (void)flipNavigationBarButton {
#define FLIP_ANIMATION_DURATION 0.5
  static BOOL flipFromLeft = YES;
  [UIView animateWithDuration:FLIP_ANIMATION_DURATION
                   animations:^ {
                     if (flipFromLeft) {
                       [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft
                                              forView:segmentedControlObject
                                                cache:YES];
                       [segmentedControlObject setTitle:@"AAA"
                                      forSegmentAtIndex:0];
                     } else {
                       [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight
                                              forView:segmentedControlObject
                                                cache:YES];
                       [segmentedControlObject setTitle:@"BBB"
                                      forSegmentAtIndex:0];
                     }
                   }
   ];
  flipFromLeft = !flipFromLeft;
}

UISegmentedControl Class Reference
http://developer.apple.com/library/ios/#DOCUMENTATION/UIKit/Reference/UISegmentedControl_Class/Reference/UISegmentedControl.html