Rotation only in one ViewController

Question

I am trying to rotate one view while all other views (5) are fixed to portrait. The reason is that in that one view I want the user to watch pictures which he saved before.

Answer 1

You can also do it in a protocol oriented way. Just create the protocol

protocol CanRotate {

}

Add the the same 2 methods in the AppDelegate in a more "swifty" way

func application(_ application: UIApplication, supportedInterfaceOrientationsFor window: UIWindow?) -> UIInterfaceOrientationMask {
    if topViewController(in: window?.rootViewController) is CanRotate {
        return .allButUpsideDown
    } else {
        return .portrait
    }
}


func topViewController(in rootViewController: UIViewController?) -> UIViewController? {
    guard let rootViewController = rootViewController else {
        return nil
    }

    if let tabBarController = rootViewController as? UITabBarController {
        return topViewController(in: tabBarController.selectedViewController)
    } else if let navigationController = rootViewController as? UINavigationController {
        return topViewController(in: navigationController.visibleViewController)
    } else if let presentedViewController = rootViewController.presentedViewController {
        return topViewController(in: presentedViewController)
    }
    return rootViewController
}

And in every ViewController that you want a different behaviour, just add the protocol name in the definition of the class.

class ViewController: UIViewController, CanRotate {}

If you want any particular combination, they you can add to the protocol a variable to override

protocol CanRotate {
    var supportedInterfaceOrientations: UIInterfaceOrientationMask
}