Textfield validation rxswift iOS || Textfield restrict the length using rxswift

 Problem:

I want to validate my textfield to restrict that to enter particular length of characters only.Not to exceed that limit.How can i achieve that?

Solution:

You have to add one extension function for your textfield with sending limits and disposebag to that textfield extension and restrict like below.

func extension UITextField {

    func validate(limit:Int,dispose:DisposeBag) {

        self.rx.text.orEmpty

        .scan("") { (previous, new) -> String in

            if new.count >limit {

                return previous ?? String(new.prefix(40))

            } else {

                return new

            }

        }

        .subscribe(self.rx.text)

        .disposed(by: dispose)

    }

}

You can call the extension function as like below.

        cell.TxtView.validate(limit: limit,dispose: cell.disposeBag)