How to force view controller orientation in iOS 8?

Question

Before iOS 8, we used below code in conjunction with supportedInterfaceOrientations and shouldAutoRotate delegate methods to force app orie

Answer 1

My solution

In AppDelegate:

func application(application: UIApplication, supportedInterfaceOrientationsForWindow window: UIWindow?) -> UIInterfaceOrientationMask {
    if let topController = UIViewController.topMostViewController() {
        if topController is XXViewController {
            return [.Portrait, .LandscapeLeft]
        }
    }
    return [.Portrait]
}

XXViewController is the ViewController you want to support Landscape mode.

Then Sunny Shah's solution would work in your XXViewController on any iOS version:

let value = UIInterfaceOrientation.LandscapeLeft.rawValue
UIDevice.currentDevice().setValue(value, forKey: "orientation")

This is the utility function to find the top most ViewController.

extension UIViewController {

    /// Returns the current application's top most view controller.
    public class func topMostViewController() -> UIViewController? {
        let rootViewController = UIApplication.sharedApplication().windows.first?.rootViewController
        return self.topMostViewControllerOfViewController(rootViewController)
    }



    /// Returns the top most view controller from given view controller's stack.
    class func topMostViewControllerOfViewController(viewController: UIViewController?) -> UIViewController? {
        // UITabBarController
        if let tabBarController = viewController as? UITabBarController,
           let selectedViewController = tabBarController.selectedViewController {
            return self.topMostViewControllerOfViewController(selectedViewController)
        }

        // UINavigationController
        if let navigationController = viewController as? UINavigationController,
           let visibleViewController = navigationController.visibleViewController {
            return self.topMostViewControllerOfViewController(visibleViewController)
        }

        // presented view controller
        if let presentedViewController = viewController?.presentedViewController {
            return self.topMostViewControllerOfViewController(presentedViewController)
        }

        // child view controller
        for subview in viewController?.view?.subviews ?? [] {
            if let childViewController = subview.nextResponder() as? UIViewController {
                return self.topMostViewControllerOfViewController(childViewController)
            }
        }

        return viewController
    }

}