RxExtensions2.swift

func bindKeyboardEvents() -> Disposable {
    let observable =
        Observable.from([
            NotificationCenter.default.rx.notification(Notification.Name.UIKeyboardWillShow) .map { notification in
                let keyboardFrame = notification.userInfo![UIKeyboardFrameEndUserInfoKey] as! CGRect
                let keyboardHeight: CGFloat = keyboardFrame.height
                return keyboardHeight
            },
            NotificationCenter.default.rx.notification(Notification.Name.UIKeyboardWillHide) .map { _ in CGFloat(0) }])
            .merge()
            .observeOn(MainScheduler.instance)
    
    
    return observable.subscribe(onNext: { [weak self] keyboardHeight in
        self?.contentInset.bottom = keyboardHeight
        self?.scrollIndicatorInsets.bottom = keyboardHeight
    })
}