Objective C iOS 9 lock viewController portrait orientation - ios

Question

After upgrade my project do iOS 9.2 my old code become obsolete
-(UIInterfaceOrientationMask)supportedInterfaceOrientations{
return UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskPortraitUpsideDown;
}
- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation{
return UIInterfaceOrientationPortrait;
}
And I found this ugly solution, after receive a rotation notification view set rotation (And repaint with animation my view controller):
-(void)didRotate:(NSNotification *)notification
{
[UIView animateWithDuration:0 animations:^{
NSNumber *value = [NSNumber numberWithInt:UIInterfaceOrientationPortrait];
[[UIDevice currentDevice] setValue:value forKey:#"orientation"];
}];
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(didRotate:)
name:UIDeviceOrientationDidChangeNotification
object:nil];
}
-(void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:YES];
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIDeviceOrientationDidChangeNotification object:nil];
}
How can I lock orientation only in this ViewController?

Answer 1

You can use the below delegate method for the orientation and it can be applicable for the class where the code is being used. These 3 lines of code is fair enough to lock your orientation.
- (UIInterfaceOrientationMask)supportedInterfaceOrientations {
return (UIInterfaceOrientationMaskPortrait);
}

Answer 2

For iOS 9 and above
First Identify your base view controller
Suppose it is a Navigation Controller.
Property for Navigation Controller:
#property (strong, nonatomic) UINavigationController *mainNavigationController;
Replace the above with:
#property (strong, nonatomic) MainNavigationContrller *mainNavigationController;
Your MainNavigationContrller.m will look like the below:
#interface MainNavigationContrller ()
#end
#implementation MainNavigationContrller
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
}
- (BOOL)shouldAutorotate
{
return YES;
}
- (UIInterfaceOrientationMask)supportedInterfaceOrientations
{
if(IPHONE)
{
UIViewController *topVC = ((AppDelegate*)[[UIApplication sharedApplication] delegate]).yourNavigationController.topViewController;
if([topVC isKindOfClass:[yourViewController class]])
{
return UIInterfaceOrientationMaskPortrait;
}
}
return UIInterfaceOrientationMaskAll;
}
With this, you need not to remove your info.plist entries and we can block the orientation for specific view only.
THIS WORKED FOR ME.