SwiftUI + PhoneNumberKit implementation

SignInView.swift

import SwiftUI
import UIKit
import PhoneNumberKit

struct PhoneNumberTextFieldView: UIViewRepresentable {
    @Binding var phoneNumber: String
    private let textField = PhoneNumberTextField()
 
    func makeUIView(context: Context) -> PhoneNumberTextField {
        textField.withExamplePlaceholder = true
        //textField.font = UIFont(name: GlobalConstant.paragraphFont.rawValue, size: 17)
        textField.withFlag = true
        textField.withPrefix = true
        // textField.placeholder = "Enter phone number"
        textField.becomeFirstResponder()
        return textField
    }

    func getCurrentText() {
        self.phoneNumber = textField.text!
    }
    
    func updateUIView(_ view: PhoneNumberTextField, context: Context) {
  
    }
    
}

struct SignUpSignInView: View {
    @State private var phoneNumber = String()
    @State private var validationError = false
    @State private var errorDesc = Text("")
    @State private var phoneField: PhoneNumberTextFieldView?
    let phoneNumberKit = PhoneNumberKit()

    var body: some View {
        ZStack {
            VStack(alignment: .leading) {
                Text("Sign in with your phone number")
                
                self.phoneField
                    .frame(minWidth: 0, maxWidth: .infinity, minHeight: 0, maxHeight: 60)
                    .keyboardType(.phonePad)
                
                Button(action: {
                    do {
                        self.phoneField?.getCurrentText()
                        print("phone is: \(self.phoneNumber)")
                        let validatedPhoneNumber = try self.phoneNumberKit.parse(self.phoneNumber)
                        print("Validated Number: \(validatedPhoneNumber)")
                        // Integrate with your login/registration system here...
                    }
                    catch {
                        self.validationError = true
                        self.errorDesc = Text("Please enter a valid phone number")
                    }

                }) {
                    Text("Sign in")
                }
                .padding(15)
                Spacer()
            }
            .padding()
            .onAppear {
                self.phoneField = PhoneNumberTextFieldView(phoneNumber: self.$phoneNumber)
            }
            .alert(isPresented: self.$validationError) {
                Alert(title: Text(""), message: self.errorDesc, dismissButton: .default(Text("OK")))
            }
        }
    }
}

The code here doesn't properly bind and to my state. When I tried to print my phoneNumber, it would only show +1.

I actually wasn't able to get J. Nunn's implementation to work. The button closure always executed before self.phoneNumber was updated in the updateUIView() function. I had to implement a separate function to explicitly update self.phoneNumber before using it in the parent SwiftUI view. And yes, the phone number field correctly displays country codes, country flags, etc.

You can see my gist here https://gist.github.com/akacaptain/58cc0f8073f436dabc869ed2aa6f3830

This ended up doing the trick, thank you.

Thank you so much! This worked!!! <3

I actually wasn't able to get J. Nunn's implementation to work. The button closure always executed before self.phoneNumber was updated in the updateUIView() function. I had to implement a separate function to explicitly update self.phoneNumber before using it in the parent SwiftUI view. And yes, the phone number field correctly displays country codes, country flags, etc.

You can see my gist here https://gist.github.com/akacaptain/58cc0f8073f436dabc869ed2aa6f3830

Thank you @akacaptain, I updated the Gist here with your corrections.

I used this implementation in .sheet(..) which is a modal. if your physical app is crashing for some reason in .sheet(), make sure to remove textField.becomeFirstResponder(). its swiftUI bug apparently when I did some research.

I have a login view and a signup view. The login view has a button to signup, the signup view has a button to go back to the login view.

If I go from login -> signup, this field works.

But if I go from login -> signup -> login -> signup, the text field no longer recognizes my input and believes it's always empty. Any ideas as to why this is happening?

Hi, I want to suggest an improvement that more compatible to SwiftUI:

import SwiftUI
import UIKit
import PhoneNumberKit

struct PhoneNumberField: UIViewRepresentable {
    
    @Binding var phoneNumber: String
    private let textField = PhoneNumberTextField()
 
    func makeUIView(context: Context) -> PhoneNumberTextField {
        textField.withExamplePlaceholder = true
        textField.withFlag = true
        textField.withPrefix = true
        textField.placeholder = "Phone"
        textField.becomeFirstResponder()
        textField.addTarget(context.coordinator, action: #selector(Coordinator.onTextUpdate), for: .editingChanged)
        return textField
    }
    
    func updateUIView(_ view: PhoneNumberTextField, context: Context) {

    }
    
    func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }

    class Coordinator: NSObject, UITextFieldDelegate {

        var control: PhoneNumberField

        init(_ control: PhoneNumberField) {
            self.control = control
        }

        @objc func onTextUpdate(textField: UITextField) {
            self.control.phoneNumber = textField.text!
        }

    }

}

Hi, I want to suggest an improvement that more compatible to SwiftUI:

import SwiftUI
import UIKit
import PhoneNumberKit

struct PhoneNumberField: UIViewRepresentable {
    
    @Binding var phoneNumber: String
    private let textField = PhoneNumberTextField()
 
    func makeUIView(context: Context) -> PhoneNumberTextField {
        textField.withExamplePlaceholder = true
        textField.withFlag = true
        textField.withPrefix = true
        textField.placeholder = "Phone"
        textField.becomeFirstResponder()
        textField.addTarget(context.coordinator, action: #selector(Coordinator.onTextUpdate), for: .editingChanged)
        return textField
    }
    
    func updateUIView(_ view: PhoneNumberTextField, context: Context) {

    }
    
    func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }

    class Coordinator: NSObject, UITextFieldDelegate {

        var control: PhoneNumberField

        init(_ control: PhoneNumberField) {
            self.control = control
        }

        @objc func onTextUpdate(textField: UITextField) {
            self.control.phoneNumber = textField.text!
        }

    }

}

Wow! This is exactly what I spent hours researching - nice idea adding a separate Class

were you guys able to show the country code picked?

I'm also wondering if anyone was able to make the country picker work in SwiftUI? The samples posted here work well but the country picker does not seem to be supported.

Update: It works perfectly fine by simply adding this line: textField.withDefaultPickerUI = true