iOS: Forcing orientation in your view controller (iOS 6 and iOS < 6)

Got this trouble on forcing the app to be in a a landscape mode. Let say, you have a standard orientation of a Portrait but at first force the view controller to be in landscape where the button is located in the left side.

So I have this code that you can try, play, and modify. See below,

1. //
2. //  MainViewController.h
5. @interface MainViewController : UIViewController <UIWebViewDelegate>
7. @end
11. // MainViewController.m
14. #import "MainViewController.h"
17. @implementation UINavigationController (autorotation)
19. // >= iOS 6
20. -(BOOL)shouldAutorotate
21. {
22.    
23.     UIInterfaceOrientation interfaceOrientation = [UIApplication sharedApplication].statusBarOrientation;
24.     NSLog(@"intefaceorientation: %d", interfaceOrientation);
25.     [self.topViewController shouldAutorotate];
26.     return YES;
27.    
28. }
30. // >= iOS 6
31. -(NSUInteger)supportedInterfaceOrientations
32. {
33.     return UIInterfaceOrientationMaskLandscapeLeft;
34.    
35. }
37. @end
40. @implementation MainViewController    
41.    
42. #pragma mark view did load
43. - (void)viewDidLoad
44. {
45.    
46.     [super viewDidLoad];
47.    
48.     self.navigationController.navigationBarHidden = YES;
49.    
50. }
52. - (void)viewDidAppear:(BOOL)animated
53. {
54. // < iOS 6
55.     [[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationLandscapeLeft animated:NO];
56. }
58. // < iOS 6
59. - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
60. {
61.     if (interfaceOrientation == UIInterfaceOrientationLandscapeLeft) {
62.         return YES;
63.     }
64.    
65.     return NO;
66. }
69. - (void)viewDidUnload {
70.    
71.     [super viewDidUnload];
72. }
74. @end
    
    
    

or