A very simple and neat-looking view controller that lets you type in OTP's quick and easy

import BJOTPViewController

// Initialise view controller
let oneTimePasswordVC = BJOTPViewController.init(withHeading: "Two Factor Authentication",
                                                 withNumberOfCharacters: 6,
                                                 delegate: self)
// Present it
self.present(oneTimePasswordVC, animated: true, completion: nil)

//Conform to BJOTPViewControllerDelegate
extension ViewController: BJOTPViewControllerDelegate {
    func authenticate(_ otp: String, from viewController: BJOTPViewController) {
        // Make API calls, show loading animation in viewController, do whatever you want.
        // You can dismiss the viewController when you're done.
        // This method will get called only after the validation is successful, i.e.,
        // after the user has filled all the textfields.
    }
}

let oneTimePasswordVC = BJOTPViewController(withHeading: "One Time Password",
                                            withNumberOfCharacters: 6,
                                            delegate: self)
                                            
// Button title. Optional. Default is "AUTHENTICATE".
oneTimePasswordVC.authenticateButtonTitle = "VERIFY OTP"

// Sets the overall accent of the view controller. Optional. Default is system blue.
oneTimePasswordVC.accentColor = UIColor.systemRed

// Currently selected text field color. Optional. This takes precedence over the accent color.
oneTimePasswordVC.currentTextFieldColor = UIColor.systemOrange

// Button color. Optional. This takes precedence over the accent color.
oneTimePasswordVC.authenticateButtonColor = UIColor.systemGreen