How to determine which textfield is active swift

Question

I cant figure out which UITextField is currently active so i can clear its text if they hit cancel on a UIBarButtonItem. Here is my code. There is

Answer 1

/// Finds the textField that is the first responder in a view hierarchy
func findActiveTextField(in subviews: [UIView], textField: inout UITextField?) {

    guard textField == nil else { return }

    for view in subviews {
        if let tf = view as? UITextField, view.isFirstResponder {
            textField = tf
            break
        }
        else if !view.subviews.isEmpty {
            findActiveTextField(in: view.subviews, textField: &textField)
        }
    }
}

// Usage
var aView: UIView = UIView()
var activeField : UITextField?
findActiveTextField(in: aView.subviews, textField: &activeField)