Access the instance of a Viewcontroller from another in swift

Question

I am trying to transfer data from the textfield of one View Controller to the label from another.

How can I call the View Controller instance from the code of the o

Answer 1

Imanou Petit and Oscar Swanros already answered correctly. However there is an alternative which is rather "hacky" that I had to use to transfer data between 2 view controllers without a segue connecting them.

To obtain the root view controller of your app you can do:

UIApplication.sharedApplication().windows[0].rootViewController

From there you can get any view controller you want. For instance, if you want the second child view controller of the root view controller then you would do:

let viewController = UIApplication.sharedApplication().windows[0].rootViewController?.childViewControllers[1] as? YourViewController
viewController?.yourProperty = newValue

Keep in mind that this approach is rather "hacky" and probably violates the best coding practices.