Attempt to present ViewController whose view is not in the windows hierarchy

Question

I meet a strange problem: I made 2 view controllers for wich I can switch the view with code:

var currentViewController:UIViewController=UIApplication.shared         


        

Answer 1

Use the extension below to retrieve the next available controller in the stack.

Swift 3

extension UIResponder {
    func next(_ type: T.Type) -> T? {
        return next as? T ?? next?.next(type)
    }
}

Swift 2.3

extension UIResponder {
    func nextResponder(_ type: T.Type) -> T? {
        return nextResponder() as? T ?? nextResponder()?.nextResponder(type)
    }
}

Inside your SKScene, view?.next(UIViewController.self) gives you the next available UIViewController in the hierarchy.

Add this extension to a group in your project called Categories, if this group does not exist already create it, then create a new file called UIResponder+NextOfType.swift and paste the extension.