UIAlertView show() behavior for UIAlertController

Question

In previous versions of iOS I was able to call show on a UIAlertView in the App Delegate. More specifically, show was called in:

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Answer 1

Here's what I ended up with:

public class func visibleViewController() -> UIViewController? {
    return self.visibleViewController(UIApplication.sharedApplication().keyWindow?.rootViewController?)
}

private class func visibleViewController(viewController: UIViewController?) -> UIViewController? {
    if viewController?.presentedViewController == nil {
        println("Visible view controller: \(viewController)")
        return viewController
    } else if let navigationController = viewController as? UINavigationController {
        return self.visibleViewController(navigationController.topViewController)
    } else if let tabBarController = viewController as? UITabBarController {
        return self.visibleViewController(tabBarController.selectedViewController)
    } else {
        return self.visibleViewController(viewController?.presentedViewController)
    }
}