How to correctly open my application in landscape mode - ios

Question

I have a view controller in which I have added an UIView full screen size, In that UIView I have the AVCapturesession that helps me to capture photos,
My view controller opens good in portrait mode but opens abruptly in landscape mode.
The code is as follows,
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor whiteColor];
[[UIDevice currentDevice]beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter]addObserver:self selector:#selector(orientationDidChange:) name:UIDeviceOrientationDidChangeNotification object:nil];
self.camera.userInteractionEnabled = YES;
UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:#selector(handlePinchGesture:)];
pinchGesture.delegate=self;
[self.camera addGestureRecognizer:pinchGesture];
[self.navigationController setNavigationBarHidden:YES animated:YES];
}
The camera is the UIView which is the property of my UIViewController,
Again,
-(void) viewDidAppear:(BOOL)animated
{
AVCaptureSession *session = [[AVCaptureSession alloc] init];
session.sessionPreset = AVCaptureSessionPresetMedium;
CALayer *viewLayer = self.camera.layer;
NSLog(#"viewLayer = %#", viewLayer);
captureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
captureVideoPreviewLayer.frame = self.camera.layer.bounds;
[self.camera.layer addSublayer: captureVideoPreviewLayer];
device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
NSError *error = nil;
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:&error];
if (!input) {
// Handle the error appropriately.
NSLog(#"ERROR: trying to open camera: %#", error);
}
[session addInput:input];
[session startRunning];
stillImageOutput = [[AVCaptureStillImageOutput alloc] init];
NSDictionary *outputSettings = [[NSDictionary alloc] initWithObjectsAndKeys: AVVideoCodecJPEG, AVVideoCodecKey, nil];
[stillImageOutput setOutputSettings:outputSettings];
[session addOutput:stillImageOutput];
isUsingFlash = NO;
isUsingFrontFacingCamera = NO;
effectiveScale = 1.0;
}
My view opens wrong in landscape mode once i rotate to portrait it gets fine and on again rotation to landscape it works good, only it does not launch properly in landscape mode why?
Here I am setting the root view controller,
sb = [UIStoryboard storyboardWithName:#"Main" bundle:nil];
cameraFirstController = [sb instantiateViewControllerWithIdentifier:#"FirstViewController"];
cameraFirstController.delegate = self;
nav = [[CustomNavigationController alloc]initWithRootViewController:cameraFirstController];
[self.viewController presentViewController:nav animated:YES completion:nil];

Answer 1

seems like problem is order of calls when you set up the window. You need to call makeKeyAndVisible before you assign the rootViewController.
self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
[self.window makeKeyAndVisible];
self.window.rootViewController = self.YourViewController;