import IQTextInputViewNotification
class ViewController: UIViewController {
    private let textInputViewObserver: IQTextInputViewNotification = .init()
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        // Subscribe
        textInputViewObserver.subscribe(identifier: "YOUR_UNIQUE_IDENTIFIER") {info in
            print(info.event.name) // BeginEditing or EndEditing event
            print(info.textInputView) // TextInputView which begin editing or end editing
            // Write your own logic here based on event
        }
    }
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        // Unsubscribe
        textInputViewObserver.unsubscribe(identifier: "YOUR_UNIQUE_IDENTIFIER")
    }
}