ios - add prefix to uiTextField in swift

Question

I am trying to add country code as prefix to textField so the user can enter the rest of his phone number

   @IBAction func phoneLogin(_ sender: Any) {
    let countryCode = "+1"
    
    guard let phoneNumber = countryCode + MobileLbl.text! else { return }
    
    if ((MobileLbl.text?.isEmpty) != nil) {
        print("Fill Your Number")
    }else {
        OTPtxt.isHidden = false
        VerifyBtn.isHidden = false
    PhoneAuthProvider.provider().verifyPhoneNumber(phoneNumber, uiDelegate: nil) { (verificationId, error) in
        if error == nil {
            guard let verifyId = verificationId else { return }
            self.def.setValue(verifyId, forKey: "verificationId")
            self.def.synchronize()
            
            print(verificationId)
        } else {
            print("Unable to get Secret verification from firebase", error?.localizedDescription)
        }
    }
    
    }
    
}

I got this error Initializer for conditional binding must have Optional type, not 'String'

question from:https://stackoverflow.com/questions/65919711/add-prefix-to-uitextfield-in-swift

Answer 1

You're force unwrapping MobileLbl.text! which no longer makes it optional. Take off the exclamation point so it's just MobileLbl.text. Also have to move countryCode to another line as it isn't optional either.

let countryCode = "+1"

guard let phone = MobileLbl.text else { return nil }

let phoneNumber = countryCode + phone