Get the Top Viewcontroller in iOS Swift

Get top most UIViewController

presentViewController shows a view controller. It doesn't return a view controller. If you're not using a UINavigationController, you're probably looking for presentedViewController and you'll need to start at the root and iterate down through the presented views.

if var topController = UIApplication.sharedApplication().keyWindow?.rootViewController {
    while let presentedViewController = topController.presentedViewController {
        topController = presentedViewController
    }

    // topController should now be your topmost view controller
}

For Swift 3+:

if var topController = UIApplication.shared.keyWindow?.rootViewController {
    while let presentedViewController = topController.presentedViewController {
        topController = presentedViewController
    }

    // topController should now be your topmost view controller
}

For iOS 13+

let keyWindow = UIApplication.shared.windows.filter {$0.isKeyWindow}.first

if var topController = keyWindow?.rootViewController {
    while let presentedViewController = topController.presentedViewController {
        topController = presentedViewController
    }

// topController should now be your topmost view controller
}

How to find topmost view controller on iOS

iOS 4 introduced the rootViewController property on UIWindow:

[UIApplication sharedApplication].keyWindow.rootViewController;

You'll need to set it yourself after you create the view controller though.

How to check if the top most view controller is an ImagePickerController

You are setting ImagePickerController.self but the class name is UIImagePickerController

You can use like this

if let imagePicker = UIApplication.shared.windows.first?.topViewController() as? UIImagePickerController {
 // Do your stuf
}

Or

if topVC.isKind(of: UIImagePickerController.self) {
    // ...
}

Note: By using this you can not cast the top view controller as a UIImagePickerController. As it's designed by apple.

You can use this and access the view controller by this.

if let pickerHostClass = NSClassFromString("PUPhotoPickerHostViewController"), topVC.isKind(of: pickerHostClass) {
   topVC.view.alpha = 0.5
}

Get the top ViewController in iOS Swift

Amit89 brought a way to a solution up. You have to call the .windowproperty of the AppDelegate.
So I changed the Swift code from the link below to work as intended to find the topmost ViewController. Make sure, that the view is already in the view hierarchy. So this method cannot be called from a .viewDidLoad

Extension to find the topmost ViewController*

extension UIApplication {
  class func topViewController(base: UIViewController? = (UIApplication.sharedApplication().delegate as! AppDelegate).window?.rootViewController) -> UIViewController? {
    if let nav = base as? UINavigationController {
      return topViewController(base: nav.visibleViewController)
    }
    if let tab = base as? UITabBarController {
      if let selected = tab.selectedViewController {
        return topViewController(base: selected)
      }
    }
    if let presented = base?.presentedViewController {
      return topViewController(base: presented)
    }
    return base
  }
}

This code originated from GitHub user Yonat in a comment to an objectiveC equivalent. I only changed the bits of code to get it to work without the .keyWindow property

How to get the current visible viewController from AppDelegate

Do conditional casting on the return value to safely check its type.

if let currentVC = UIApplication.topViewController() as? MyViewController {
   //the type of currentVC is MyViewController inside the if statement, use it as you want to
}

Your whole function implementation is flawed, if it actually worked, it would lead to infinite recursion. Once you find out the type of your current top view controller in your if statements, you are calling the same function again with the current root controller as its input value. Your function only ever exists, if it reaches either a call from a view controller, whose class is none of the ones specified in your optional bindings.

Moreover, your whole implementation doesn't do anything at the moment. You find out the type of your root view controller, but than you upcast it by returning a value of type UIViewController.

Get current ViewController in external method in Swift

extension UIApplication{
class func getPresentedViewController() -> UIViewController? {
    var presentViewController = UIApplication.shared.keyWindow?.rootViewController
    while let pVC = presentViewController?.presentedViewController
    {
        presentViewController = pVC
    }

    return presentViewController
  }
}

just add this extension and call : UIApplication. getPresentedViewController()

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