UIAlertController:supportedInterfaceOrientations was invoked recursively

This is a bug in iOS 9 that it failed to retrieve the supportedInterfaceOrientations for UIAlertController. And it seems it dropped to an infinite recursion loop in looking for the supportedInterfaceOrientations for UIAlertController (e.g., it tracks back to UIAlertControler -> UIViewController -> UINavigationController -> UITabBarController -> UIAlertController -> ...), while the call to UIAlertController:supportedInterfaceOrientations actually is not implemented/overridden in the source code.

In my solution, I just added the following piece of code:

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

Then UIAlertController will directly return the supported orientation value without infinite loop. Hope it helps.

Edit: Swift 3.0.1

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

My solution is an Objective-C category for UIAlertViewController. Simply include UIAlertController+supportedInterfaceOrientations.h in any classes that use UIAlertController

UIAlertController+supportedInterfaceOrientations.h

//
//  UIAlertController+supportedInterfaceOrientations.h

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

UIAlertController+supportedInterfaceOrientations.m

//
//  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

As an update to Roland Keesom's answer, above, this is what worked for me. The main difference is that the supportedInterfaceOrientations function actually returns a UIInterfaceOrientationMask rather than an Int.

And in this variant all orientations are supported.

extension UIAlertController {

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

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