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November 8, 2017 10:55
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To retrieve the view controller that is currently displayed in Swift
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func currentViewController(_ viewController: UIViewController? = UIApplication.shared.keyWindow?.rootViewController) -> UIViewController? { | |
guard let viewController = viewController else { return nil } | |
if let viewController = viewController as? UINavigationController { | |
if let viewController = viewController.visibleViewController { | |
return currentViewController(viewController) | |
} else { | |
return currentViewController(viewController.topViewController) | |
} | |
} else if let viewController = viewController as? UITabBarController { | |
if let viewControllers = viewController.viewControllers, viewControllers.count > 5, viewController.selectedIndex >= 4 { | |
return currentViewController(viewController.moreNavigationController) | |
} else { | |
return currentViewController(viewController.selectedViewController) | |
} | |
} else if let viewController = viewController.presentedViewController { | |
return viewController | |
} else if viewController.childViewControllers.count > 0 { | |
return viewController.childViewControllers[0] | |
} else { | |
return viewController | |
} | |
} | |
USAGE: | |
======= | |
Call it with: currentViewController() |
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