CometChat- Chat Application

ConversationsVC.swift

import CometChatPro

class ConversationsVC: CometChatConversationList {
    
    @IBOutlet weak var newChatButton: UIButton!
    
    static func storyboardInstance() -> ConversationsVC? {
        let storyboard = UIStoryboard(name: "Main" ,bundle: nil)
        return storyboard.instantiateViewController(withIdentifier: "ConversationsVC") as? ConversationsVC
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
    }
    
    public override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        newChatButton.superview?.bringSubviewToFront(newChatButton)
    }
    
    @IBAction func newChatTapped(_ sender: Any) {
        openContactsList()
    }
    
    private func openContactsList(){
        DispatchQueue.main.async {
            let userList = CometChatUserList()
            let navigationController = UINavigationController(rootViewController:userList)
            userList.set(title:"Contacts", mode: .automatic)
            self.present(navigationController, animated:true, completion:nil)
        }
    }
    
}

RegistrationLoginVC.swift

import CometChatPro

class RegistrationLoginVC: UIViewController {
    
    @IBOutlet weak var signIn: UIButton!
    @IBOutlet weak var nameTextField: UITextField!
    @IBOutlet weak var mobileTextField: UITextField!    
    @IBOutlet weak var activityIndicator: UIActivityIndicatorView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
    }
    
    @IBAction func signInPressed(_ sender: Any) {
        let uid = "\(nameTextField.text!.first!)\(mobileTextField.text!)"
        registerUser(uid: uid , name: nameTextField.text!)
    }
    
    private func registerUser(uid: String, name: String){
        showActivityIndicator()
        
        let newUser : User = User(uid: uid, name: name)
        CometChat.createUser(user: newUser, apiKey: Constants.apiKey, onSuccess: { (User) in
            print("User created successfully. \(User.stringValue())")
            self.hideActivityIndicator()
            if CometChat.getLoggedInUser() == nil {
                self.loginUser(uid: uid)
            }
            
          }) { (error) in
            print("The error is \(String(describing: error?.errorDescription))")
            self.hideActivityIndicator()
        }

    }
    
    private func loginUser(uid: String){
        showActivityIndicator()
        
        CometChat.login(UID: uid, apiKey: Constants.apiKey, onSuccess: { (user) in
            print("Login successful : " + user.stringValue())
            self.hideActivityIndicator()
            self.openChats()

        }) { (error) in
            print("Login failed with error: " + error.errorDescription);
            self.hideActivityIndicator()
        }
    }
    
    private func openChats(){
        DispatchQueue.main.async {
            let conversationList = ConversationsVC.storyboardInstance()
            let navigationController = UINavigationController(rootViewController:conversationList!)
            conversationList!.set(title:"Chats", mode: .automatic)
            self.present(navigationController, animated:true, completion:nil)
        }
    }
    
    private func showActivityIndicator(){
        DispatchQueue.main.async {
            self.activityIndicator.startAnimating()
        }
    }
    
    private func hideActivityIndicator(){
        DispatchQueue.main.async {
            self.activityIndicator.stopAnimating()
        }
    }

}