There are times when we need to get top most presented UIViewController. We can do so with help of an extension of UIWindow. Consider the following code:
| // https://hashaam.com/2017/08/31/uiwindow-presentation-context/ | |
| extension UIWindow { | |
| func presentationContext(context: UIViewController? = nil) -> UIViewController? { | |
| var presentationContextViewController = rootViewController | |
| if let context = context { | |
| presentationContextViewController = context | |
| } | |
| if presentationContextViewController?.presentedViewController == nil { | |
| if let navigationController = presentationContextViewController as? UINavigationController { | |
| return navigationController.topViewController | |
| } | |
| return presentationContextViewController | |
| } | |
| return presentationContext(context: presentationContextViewController?.presentedViewController) | |
| } | |
| } |
Then we can call using:
| // https://hashaam.com/2017/08/31/uiwindow-presentation-context/ | |
| if let delegate = UIApplication.shared.delegate, let window = delegate.window, let viewController = window?.presentationContext() { | |
| // perform action on viewController | |
| } |
