NoRotate

gistfile1.txt

//In the controllers to not rotate
  override var shouldAutorotate : Bool {
          return false
      }
  override var supportedInterfaceOrientations : UIInterfaceOrientationMask {
      return UIInterfaceOrientationMask.portrait
  }
  
  //otherwise i did not change anything. and as long as all orientations are supported if you don't set above it will rotate.
  // on dismiss i think it reoriented but i might have ask for layout or something cannot remember.
  // i think in the case of collectionviews i might have had to invalidate layout in viewwillappear but cannot remember
  
  //navigation controller if you need it
  import UIKit

class MainNavViewController: UINavigationController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // Do any additional setup after loading the view.
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    
    
    override var shouldAutorotate: Bool {
        if !viewControllers.isEmpty{
            return self.topViewController!.shouldAutorotate
        }else{
            return true
        }
        
    }
    
    override var supportedInterfaceOrientations: UIInterfaceOrientationMask{
        if !viewControllers.isEmpty{
            return self.topViewController!.supportedInterfaceOrientations
        }else{
            return self.supportedInterfaceOrientations
        }
        
    }
}