how to lock portrait orientation for only main view using swift

Question

I have created an application for iPhone, using swift, that is composed from many views embedded in a navigation controller. I would like to lock the main v

Answer 1

Update: if you're having trouble to set orientation right after the app launches in iOS 10, try do it in ObjC instead of Swift, and with class MyNavigationController: MyNavigationControllerBase:

@implementation ABNavigationControllerBase
- (NSUInteger)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskPortrait;
}
@end

Swift 3:

class MyNavigationController: UINavigationController {
    override func viewDidLoad() {
        super.viewDidLoad()
        UIDevice.current.setValue(UIInterfaceOrientation.portrait.rawValue, forKey: "orientation")
    }
    override var shouldAutorotate: Bool {
        return false
    }
    override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
        return .portrait
    }
    override var preferredInterfaceOrientationForPresentation: UIInterfaceOrientation {
        return .portrait
    }
}