extension UIAlertController {
    public override func supportedInterfaceOrientations() -> UIInterfaceOrientationMask {
        return UIInterfaceOrientationMask.Portrait
    }
    public override func shouldAutorotate() -> Bool {
        return false
    }
}

extension UIAlertController {
    open override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
        return UIInterfaceOrientationMask.portrait
    }
    open override var shouldAutorotate: Bool {
        return false
    }
}

//
//  UIAlertController+supportedInterfaceOrientations.h

#import <UIKit/UIKit.h>
@interface UIAlertController (supportedInterfaceOrientations)
@end

//
//  UIAlertController+supportedInterfaceOrientations.m

#import "UIAlertController+supportedInterfaceOrientations.h"

@implementation UIAlertController (supportedInterfaceOrientations)

#if __IPHONE_OS_VERSION_MAX_ALLOWED < 90000
- (NSUInteger)supportedInterfaceOrientations {
    return UIInterfaceOrientationMaskPortrait;
}
#else
- (UIInterfaceOrientationMask)supportedInterfaceOrientations {
    return UIInterfaceOrientationMaskPortrait;
}
#endif

@end

extension UIAlertController {

    public override func shouldAutorotate() -> Bool {
        return true
    }

    public override func supportedInterfaceOrientations() -> UIInterfaceOrientationMask {
        return UIInterfaceOrientationMask.All
    }
}

class MyUIAlertController : UIAlertController {

       override func supportedInterfaceOrientations() -> UIInterfaceOrientationMask {
              return [UIInterfaceOrientationMask.Portrait,UIInterfaceOrientationMask.PortraitUpsideDown]
       }

       override func shouldAutorotate() -> Bool {
            return false
       }
}