write code to verify a users phone number using firebase in swift

You could use Firebase Authentication to verify a user's phone number in Swift. Here's an example code snippet to achieve this:


main.swift
import FirebaseAuth

// Function to verify phone number
func verifyPhoneNumber(phoneNumber: String) {
    // Create params for phone number verification
    let verifyID = PhoneAuthProvider.provider().verifyPhoneNumber(phoneNumber, uiDelegate: nil) { (verificationID, error) in
        if let error = error {
            print(error.localizedDescription)
            return
        }
        
        // Store verification ID in user defaults or keychain
        UserDefaults.standard.set(verificationID, forKey: "authVerificationID")
    }
}

// Function to verify the verification code entered by user
func verifyVerificationCode(code: String) {
    // Retrieve verification ID from user defaults or keychain
    guard let verificationID = UserDefaults.standard.string(forKey: "authVerificationID") else {
        return
    }
    
    let credential = PhoneAuthProvider.provider().credential(withVerificationID: verificationID, verificationCode: code)
    
    // Authenticate user with the phone number
    Auth.auth().signIn(with: credential) { (authResult, error) in
        if let error = error {
            print(error.localizedDescription)
            return
        }
        
        // User is authenticated successfully
        print("User authenticated successfully")
    }
}

// Example Usage
verifyPhoneNumber(phoneNumber: "+123456789") // Replace with user's phone number
// Send the verification code to user via SMS and let user enter the verification code
verifyVerificationCode(code: "123456") // Replace with the verification code entered by user
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42 lines

Please note that phone number verification is dependent on the user's location and the country code should be prefixed with a "+".

Also, you can use regular expressions(regex) to make sure the phone number is in the correct format before sending it to Firebase for verification. Here's an example regex code for a US phone number:


main.swift
let phoneRegex = "^\\+?1?[\\-\\s]?\\(?([0-9]{3})\\)?[\\-\\s]?([0-9]{3})[\\-\\s]?([0-9]{4})$"
let phoneTest = NSPredicate(format:"SELF MATCHES %@", phoneRegex)
let isPhoneNumberValid = phoneTest.evaluate(with: "+11234567890") // Replace with user's phone number
print(isPhoneNumberValid)
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