Get visibleViewController using UIWindow? [duplicate] - ios

Question

This question already has answers here:
How to find topmost view controller on iOS
(42 answers)
Closed 5 years ago.
So, I have self as UIWindow, but how can I get visibleViewController at current moment?

Answer 1

IN swift3:
func getVisibleViewController(_ rootViewController: UIViewController?) -> UIViewController? {
var rootVC = rootViewController
if rootVC == nil {
rootVC = UIApplication.shared.keyWindow?.rootViewController
}
if rootVC?.presentedViewController == nil {
return rootVC
}
if let presented = rootVC?.presentedViewController {
if presented.isKind(of: UINavigationController.self) {
let navigationController = presented as! UINavigationController
return navigationController.viewControllers.last!
}
if presented.isKind(of: UITabBarController.self) {
let tabBarController = presented as! UITabBarController
return tabBarController.selectedViewController!
}
return getVisibleViewController(presented)
}
return nil
}

Answer 2

You should check out this answer. The gist of it is that you start with the window's .rootViewController. In my own code (using a UINavigationController as the .rootViewController, I use this (in AppDelegate):
if let nvc = self.window?.rootViewController as? UINavigationController {
if let mvc = nvc.topViewController as? MasterViewController {
// ... do something
} else if let dvc = nvc.topViewController as? DetailViewController {
// ... do something
}
}
Note that if you are using the default template for a Master-Detail application, you will need to consider the SplitViewController which interposes itself, but that should be reasonably obvious from the boilerplate code.

Answer 3

If you add the child view controller:
let viewControllersVisible = self.rootViewController?.childViewControllers.filter({ $0.isVisible && $0.view.window })
This returns an array of UIViewControllers added in your view hierarchy, it doesn't say if the user is actually able to see those view controllers, depends on your hierarchy.
if you present modally just a view controller:
let viewControllerVisible = self.rootViewController?.presentedViewController

Answer 4

Inorder to get a reference to the top most view controller in the hierarchy try the following code
UIViewController *topController = [UIApplication sharedApplication].keyWindow.rootViewController;
while (topController.presentedViewController)
{
topController = topController.presentedViewController;
}
return topController;

Answer 5

If you want the topmost view on window try with this you will get the view.
[[[[UIApplication sharedApplication] keyWindow] subviews] lastObject];