Objectivec UIAlertController：supportedInterfaceOrientations 被递归调用

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.

在我的解决方案中，我刚刚添加了以下代码:

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

然后UIAlertController将直接返回支持的方向值，无需无限循环.希望有帮助.

Edit: Swift 3.0.1

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