How to maintain presenting view controller's orientation when dismissing modal view controller?

Question

I have this app I am working on and I need ALL my view controllers but one to be in portrait. The single one view controller that is special I need it to be able to rotate t

Answer 1

Swift 3.0 OR Above, Just check "isBeingDismissed" property of presented view controller. Below is sample code, This is will rotate presenting view controller to portrait mode immediately after presented view controller is dismissed.

func application(_ application: UIApplication, supportedInterfaceOrientationsFor window: UIWindow?) -> UIInterfaceOrientationMask {
if let rootViewController = self.topViewControllerWithRootViewController(rootViewController: window?.rootViewController)
{
  if rootViewController.canRotateVC == true
  {
    if baseVC.isBeingDismissed == false
    {
      return .allButUpsideDown
    }
  }
}

  return .portrait}

you can get topController by below code:

  private func topViewControllerWithRootViewController(rootViewController: UIViewController!) -> UIViewController?{
if (rootViewController == nil) { return nil }if (rootViewController.isKind(of: (UITabBarController).self))
{
  return topViewControllerWithRootViewController(rootViewController: (rootViewController as! UITabBarController).selectedViewController)
}
else if (rootViewController.isKind(of:(UINavigationController).self))
{
  return topViewControllerWithRootViewController(rootViewController: (rootViewController as! UINavigationController).visibleViewController)
}
else if (rootViewController.presentedViewController != nil)
{
  return topViewControllerWithRootViewController(rootViewController: rootViewController.presentedViewController)
}
return rootViewController }