Edward Jackson

Edward Jackson

1560831758

Creating an iOS app with user presence using Node.js and Swift

We will create a sample chat application to demonstrate this feature. However, because we are focusing on just user presence, we will not implement the actual chat feature.

If you are building an application that has a user base, you might need to show your users when their friends are currently online. This comes in handy especially in messenger applications where the current user would like to know which of their friends are available for instant messaging.

Here is a screen recording on how we want the application to work:

If you want a tutorial on how to create a messenger application on iOS, check out this article.


Prerequisites

To follow along you need the following requirements:

  1. Xcode installed on your machine. Download here.
  2. Knowledge of the Swift programming language.
  3. Knowledge of the Xcode IDE.
  4. A Pusher Channels app. Create one here.
  5. Cocoapods installed on your machine. Installation guide.
  6. Node.js and npm installed on your machine. Installation guide.
  7. Basic knowledge of JavaScript and Node.js.

Let’s get started.


Creating the backend of the application

Before creating the iOS application, let’s create the backend application in Node.js. This application will have the necessary endpoints the application will need to function properly. To get started, create a new directory for the project.


Installing the dependencies

In the root of the project, create a new package.json file and paste the following contents into it:

    {
      "name": "presensesample",
      "version": "1.0.0",
      "main": "index.js",
      "dependencies": {
        "body-parser": "^1.18.3",
        "express": "^4.16.4",
        "pusher": "^2.1.3"
      }
    }

Above, we have defined some npm dependencies that the backend application will need to function. Amongst the dependencies, we can see the pusher library. This is the Pusher JavaScript server SDK.

Next, open your terminal application and cd to the root of the project you just created and run the following command:

    $ npm install

This command will install all the dependencies we defined above in the package.json file.


Creating the main application

Next, create a new file called index.js and paste the following code into the file:

    // File: ./index.js
const express = require(‘express’);
const bodyParser = require(‘body-parser’);
const Pusher = require(‘pusher’);
const app = express();

let users = {};
let currentUser = {};

let pusher = new Pusher({
  appId: 'PUSHER_APP_ID',
  key: 'PUSHER_APP_KEY',
  secret: 'PUSHER_APP_SECRET',
  cluster: 'PUSHER_APP_CLUSTER'
});

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));

// TODO: Add routes here

app.listen(process.env.PORT || 5000);

In the code above, we imported the libraries we need for the backend application. We then instantiated two new variables: users and currentUser. We will be using these variables as a temporary in-memory store for the data since we are not using a database.

Next, we instantiated the Pusher library using the credentials for our application. We will be using this instance to communicate with the Pusher API. Next, we add the listen method which instructs the Express application to start the application on port 5000.

Next, let’s add some routes to the application. In the code above, we added a comment to signify where we will be adding the route definitions. Replace the comment with the following code:

    // File: ./index.js

// [...]

app.post('/users', (req, res) => {
  const name = req.body.name;
  const matchedUsers = Object.keys(users).filter(id => users[id].name === name);

  if (matchedUsers.length === 0) {
    const id = generate_random_id();
    users[id] = currentUser = { id, name };
  } else {
    currentUser = users[matchedUsers[0]];
  }

  res.json({ currentUser, users });
});

// [...]

Above, we have the first route. The route is a POST route that creates a new user. It first checks the users object to see if a user already exists with the specified name. If a user does not exist, it generates a new user ID using the generate_random_id method (we will create this later) and adds it to the users object. If a user exists, it skips all of that logic.

Regardless of the outcome of the user check, it sets the currentUser as the user that was created or matched and then returns the currentUser and users object as a response.

Next, let’s define the second route. Because we are using presence channels, and presence channels are private channels, we need an endpoint that will authenticate the current user. Below the route above, add the following code:

    // File: ./index.js

// [...]

app.post('/pusher/auth/presence', (req, res) => {
  let socketId = req.body.socket_id;
  let channel = req.body.channel_name;

  let presenceData = {
    user_id: currentUser.id,
    user_info: { name: currentUser.name }
  };

  let auth = pusher.authenticate(socketId, channel, presenceData);

  res.send(auth);
});

// [...]

Above, we have the Pusher authentication route. This route gets the expected socket_id and channel_name and uses that to generate an authentication token. We also supply a presenceData object that contains all the information about the user we are authenticating. We then return the token as a response to the client.

Finally, in the first route, we referenced a function generate_random_id. Below the route we just defined, paste the following code:

    // File: ./index.js

// [...]

function generate_random_id() {
  let s4 = () => (((1 + Math.random()) * 0x10000) | 0).toString(16).substring(1);
  return s4() + s4() + '-' + s4() + '-' + s4() + '-' + s4() + s4() + s4();
}

// [...] 

The function above just generates a random ID that we can then use as the user ID when creating new users.

Let’s add a final default route. This will catch visits to the backend home. In the same file, add the following:

    // […]

app.get('/', (req, res) => res.send('It works!'));

// [...]

With this, we are done with the Node.js backend. You can run your application using the command below:

    $ node index.js

Your app will be available here: http://localhost:5000.


Building the iOS application

Launch Xcode and create a new sample Single View App project. We will call ours presensesample.

When you are done creating the application, close Xcode. Open your terminal application and cd to the root directory of the iOS application and run the following command:

    $ pod init

This will create a new Podfile file in the root directory of your application. Open the file and replace the contents with the following:

    # File: ./Podfile
target ‘presensesample’ do
platform :ios, ‘12.0’

  use_frameworks!

  pod 'Alamofire', '~> 4.7.3'
  pod 'PusherSwift', '~> 5.0'
  pod 'NotificationBannerSwift', '~> 1.7.3'
end

Above, we have defined the application’s dependencies. To install the dependencies, run the following command:

    $ pod install

The command above will install all the dependencies in the Podfile and also create a new .xcworkspace file in the root of the project. Open this file in Xcode to launch the project and not the .xcodeproj file.


Creating the scenes

The first thing we will do is create the storyboard scenes we need for the application to work. We want the storyboard to look like this:

Open the main storyboard file and delete all the scenes in the file so it is empty. Next, add a view controller to the scene.

TIP: You can use the command + shift + L shortcut to bring the objects library.

With the view controller selected, click on Editor > Embed In > Navigation Controller. This will embed the current view controller in a navigation controller. Next, with the navigation view controller selected, open the attributes inspector and select the Is Initial View Controller option to set the navigation view controller as the entry point for the storyboard.

Next, design the view controller as seen in the screenshot below. Later on in the article, we will be connecting the text field and button to the code using an @IBOutlet and an @IBAction.

Next, add the tab bar controller and connect it to the view controller using a manual segue. Since tab bar controllers come with two regular view controllers, delete them and add two table view controllers instead as seen below:

When you are done creating the scenes, let’s start adding the necessary code.


Adding code to the created scenes

Create a new controller class called LoginViewController and set it as the custom class for the first view controller attached to the navigation controller. Paste the following code into the file:

    // File: ./presensesample/LoginViewController.swift
import UIKit
import Alamofire
import PusherSwift
import NotificationBannerSwift

class LoginViewController: UIViewController {
    var user: User? = nil
    var users: [User] = []

    @IBOutlet weak var nameTextField: UITextField!

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)

        user = nil
        users = []

        navigationController?.isNavigationBarHidden = true
    }

    @IBAction func startChattingButtonPressed(_ sender: Any) {
        if nameTextField.text?.isEmpty == false, let name = nameTextField.text {
            registerUser(["name": name.lowercased()]) { successful in
                guard successful else {
                    return StatusBarNotificationBanner(title: "Failed to login.", style: .danger).show()
                }

                self.performSegue(withIdentifier: "showmain", sender: self)
            }
        }
    }

    func registerUser(_ params: [String : String], handler: @escaping(Bool) -> Void) {
        let url = "http://127.0.0.1:5000/users"

        Alamofire.request(url, method: .post, parameters: params)
            .validate()
            .responseJSON { resp in
                if resp.result.isSuccess,
                    let data = resp.result.value as? [String: Any],
                    let user = data["currentUser"] as? [String: String],
                    let users = data["users"] as? [String: [String: String]],
                    let id = user["id"], let name = user["name"]
                {
                    for (uid, user) in users {
                        if let name = user["name"], id != uid {
                            self.users.append(User(id: uid, name: name))
                        }
                    }

                    self.user = User(id: id, name: name)
                    self.nameTextField.text = nil

                    return handler(true)
                }

                handler(false)
        }
    }

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if let vc = segue.destination as? MainViewController {
            vc.viewControllers?.forEach {
                if let onlineVc = $0 as? OnlineTableViewController {
                    onlineVc.users = self.users
                    onlineVc.user = self.user
                }
            }
        }
    }
}

In the controller above, we have defined the users and user properties which will hold the available users and the current user when the user is logged in. We also have the nameTextField which is an @IBOutlet to the text field in the storyboard view controller, so make sure you connect the outlet if you hadn’t previously done so.

In the same controller, we have the startChattingButtonPressed method which is an @IBAction so make sure you connect it to the submit button in the storyboard view controller if you have not already done so. In this method, we call the registerUser method to register the user using the API. If the registration is successful, we direct the user to the showmain segue.

The segue between the login view controller and the tab bar controller should be set with an identifier of showmain.

In the registerUser method, we send the name to the API and receive a JSON response. We parse it to see if the registration was successful or not.

The final method in the class is the prepare method. This method is automatically called by iOS when a new segue is being loaded. We use this to preset some data to the view controller we are about to load.

Next, create a new file called MainViewController and set this as the custom class for the tab bar view controller. In the file, paste the following code:

    // File: ./presensesample/MainViewController.swift
import UIKit

class MainViewController: UITabBarController {

    override func viewDidLoad() {
        super.viewDidLoad()

        navigationItem.title = "Who's Online"
        navigationItem.hidesBackButton = true
        navigationController?.isNavigationBarHidden = false

        // Logout button
        navigationItem.rightBarButtonItem = UIBarButtonItem(
            title: "Logout",
            style: .plain,
            target: self,
            action: #selector(logoutButtonPressed)
        )
    }

    override func tabBar(_ tabBar: UITabBar, didSelect item: UITabBarItem) {
        navigationItem.title = item.title
    }

    @objc fileprivate func logoutButtonPressed() {
        viewControllers?.forEach {
            if let vc = $0 as? OnlineTableViewController {
                vc.users = []
                vc.pusher.disconnect()
            }
        }

        navigationController?.popViewController(animated: true)
    }
}

In the controller above, we have a few methods defined. The viewDidLoad method sets the title of the controller and other navigation controller specific things. We also define a Logout button in this method. The button will trigger the logoutButtonPressed method.

In the logoutButtonPressed method, we try to log the user out by resetting the users property in the view controller and also we disconnect the user from the Pusher connection.

Next, create a new controller class named ChatTableViewController. Set this class as the custom class for one of the tab bar controllers child controllers. Paste the following code into the file:

    // File: ./presensesample/ChatTableViewController.swift
import UIKit

class ChatTableViewController: UITableViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
    }

    override func numberOfSections(in tableView: UITableView) -> Int {
        return 0
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return 0
    }
}

The controller above is just a base controller and we do not intend to add any chat logic to this controller.

Create a new controller class called OnlineTableViewController. Set this controller as the custom class for the second tab bar controller child controller. Paste the following code to the controller class:

    // File: ./presensesample/OnlineTableViewController.swift
import UIKit
import PusherSwift

struct User {
    let id: String
    var name: String
    var online: Bool = false

    init(id: String, name: String, online: Bool? = false) {
        self.id = id
        self.name = name
        self.online = online!
    }
}

class OnlineTableViewController: UITableViewController {

    var pusher: Pusher!
    var user: User? = nil
    var users: [User] = []

    override func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return users.count
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "onlineuser", for: indexPath)
        let user = users[indexPath.row]

        cell.textLabel?.text = "\(user.name) \(user.online ? "[Online]" : "")"

        return cell
    }
}

In the code above, we first defined a User struct. We will use this to represent the user resource. We have already referenced this struct in previous controllers we created earlier.

Next, we defined the OnlineTableViewController class which is extends the UITableViewController class. In this class, we override the usual table view controller methods to provide the table with data.

You have to set the cell reuse identifier of this table to onlineuser in the storyboard.

Above we also defined some properties:

  • pusher - this will hold the Pusher SDK instance that we will use to subscribe to Pusher Channels.
  • users - this will hold an array of User structs.
  • user - this is the user struct of the current user.

Next, in the same class, add the following method:

    // File: ./presensesample/OnlineTableViewController.swift

// [...]

override func viewDidLoad() {
    super.viewDidLoad()

    tableView.allowsSelection = false

    // Create the Pusher instance...
    pusher = Pusher(
        key: "PUSHER_APP_KEY",
        options: PusherClientOptions(
            authMethod: .endpoint(authEndpoint: "http://127.0.0.1:5000/pusher/auth/presence"),
            host: .cluster("PUSHER_APP_CLUSTER")
        )
    )

    // Subscribe to a presence channel...
    let channel = pusher.subscribeToPresenceChannel(
        channelName: "presence-chat",
        onMemberAdded: { member in
            if let info = member.userInfo as? [String: String], let name = info["name"] {
                if let index = self.users.firstIndex(where: { $0.id == member.userId }) {
                    let userModel = self.users[index]
                    self.users[index] = User(id: userModel.id, name: userModel.name, online: true)
                } else {
                    self.users.append(User(id: member.userId, name: name, online: true))
                }

                self.tableView.reloadData()
            }
        },
        onMemberRemoved: { member in
            if let index = self.users.firstIndex(where: { $0.id == member.userId }) {
                let userModel = self.users[index]
                self.users[index] = User(id: userModel.id, name: userModel.name, online: false)
                self.tableView.reloadData()
            }
        }
    )

    // Bind to the subscription succeeded event...
    channel.bind(eventName: "pusher:subscription_succeeded") { data in
        guard let deets = data as? [String: AnyObject],
            let presence = deets["presence"] as? [String: AnyObject],
            let ids = presence["ids"] as? NSArray else { return }

        for userid in ids {
            guard let uid = userid as? String else { return }

            if let index = self.users.firstIndex(where: { $0.id == uid }) {
                let userModel = self.users[index]
                self.users[index] = User(id: uid, name: userModel.name, online: true)
            }
        }

        self.tableView.reloadData()
    }

    // Connect to Pusher
    pusher.connect()
}

// [...]

In the viewDidLoad method above, we are doing several things. First, we instantiate the Pusher instance. In the options, we specify the authorize endpoint. We use the same URL as the backend we created earlier.

The next thing we do is subscribe to a presence channel called presence-chat. When working with presence channels, the channel name must be prefixed with presence-. The subscribeToPresenceChannel method has two callbacks that we can add logic to:

  • onMemberAdded - this event is called when a new user joins the presence-chat channel. In this callback, we check for the user that was added and mark them as online in the users array.
  • onMemberRemoved - this event is called when a user leaves the presence-chat channel. In this callback, we check for the user that left the channel and mark them as offline.

Next, we bind to the pusher:subscription_succeeded event. This event is called when a user successfully subscribes to updates on a channel. The callback on this event returns all the currently subscribed users. In the callback, we use this list of subscribed users to mark them online in the application.

Finally, we use the connect method on the pusher instance to connect to Pusher.


Allowing local connections on the iOS app

One last thing we need to do before we are done with the iOS application is allowing the application load data from arbitrary URLs. By default, iOS does not allow this, and it should not. However, since we are going to be testing locally, we need this turned on temporarily. Open the info.plist file and update it as seen below:

Now, our app is ready. You can run the application and you should see the online presence status of other users when they log in.


Conclusion

In this tutorial, we learned how to use presence channels in your iOS application using Pusher Channels.

The source code for the application created in this tutorial is available on GitHub.


Learn More

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Originally published by Neo Ighodaro at https://pusher.com/

#mobile-apps #node-js #swift #ios

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Fredy  Larson

Fredy Larson

1595059664

How long does it take to develop/build an app?

With more of us using smartphones, the popularity of mobile applications has exploded. In the digital era, the number of people looking for products and services online is growing rapidly. Smartphone owners look for mobile applications that give them quick access to companies’ products and services. As a result, mobile apps provide customers with a lot of benefits in just one device.

Likewise, companies use mobile apps to increase customer loyalty and improve their services. Mobile Developers are in high demand as companies use apps not only to create brand awareness but also to gather information. For that reason, mobile apps are used as tools to collect valuable data from customers to help companies improve their offer.

There are many types of mobile applications, each with its own advantages. For example, native apps perform better, while web apps don’t need to be customized for the platform or operating system (OS). Likewise, hybrid apps provide users with comfortable user experience. However, you may be wondering how long it takes to develop an app.

To give you an idea of how long the app development process takes, here’s a short guide.

App Idea & Research

app-idea-research

_Average time spent: two to five weeks _

This is the initial stage and a crucial step in setting the project in the right direction. In this stage, you brainstorm ideas and select the best one. Apart from that, you’ll need to do some research to see if your idea is viable. Remember that coming up with an idea is easy; the hard part is to make it a reality.

All your ideas may seem viable, but you still have to run some tests to keep it as real as possible. For that reason, when Web Developers are building a web app, they analyze the available ideas to see which one is the best match for the targeted audience.

Targeting the right audience is crucial when you are developing an app. It saves time when shaping the app in the right direction as you have a clear set of objectives. Likewise, analyzing how the app affects the market is essential. During the research process, App Developers must gather information about potential competitors and threats. This helps the app owners develop strategies to tackle difficulties that come up after the launch.

The research process can take several weeks, but it determines how successful your app can be. For that reason, you must take your time to know all the weaknesses and strengths of the competitors, possible app strategies, and targeted audience.

The outcomes of this stage are app prototypes and the minimum feasible product.

#android app #frontend #ios app #minimum viable product (mvp) #mobile app development #web development #android app development #app development #app development for ios and android #app development process #ios and android app development #ios app development #stages in app development

Aria Barnes

Aria Barnes

1622719015

Why use Node.js for Web Development? Benefits and Examples of Apps

Front-end web development has been overwhelmed by JavaScript highlights for quite a long time. Google, Facebook, Wikipedia, and most of all online pages use JS for customer side activities. As of late, it additionally made a shift to cross-platform mobile development as a main technology in React Native, Nativescript, Apache Cordova, and other crossover devices. 

Throughout the most recent couple of years, Node.js moved to backend development as well. Designers need to utilize a similar tech stack for the whole web project without learning another language for server-side development. Node.js is a device that adjusts JS usefulness and syntax to the backend. 

What is Node.js? 

Node.js isn’t a language, or library, or system. It’s a runtime situation: commonly JavaScript needs a program to work, however Node.js makes appropriate settings for JS to run outside of the program. It’s based on a JavaScript V8 motor that can run in Chrome, different programs, or independently. 

The extent of V8 is to change JS program situated code into machine code — so JS turns into a broadly useful language and can be perceived by servers. This is one of the advantages of utilizing Node.js in web application development: it expands the usefulness of JavaScript, permitting designers to coordinate the language with APIs, different languages, and outside libraries.

What Are the Advantages of Node.js Web Application Development? 

Of late, organizations have been effectively changing from their backend tech stacks to Node.js. LinkedIn picked Node.js over Ruby on Rails since it took care of expanding responsibility better and decreased the quantity of servers by multiple times. PayPal and Netflix did something comparative, just they had a goal to change their design to microservices. We should investigate the motivations to pick Node.JS for web application development and when we are planning to hire node js developers. 

Amazing Tech Stack for Web Development 

The principal thing that makes Node.js a go-to environment for web development is its JavaScript legacy. It’s the most well known language right now with a great many free devices and a functioning local area. Node.js, because of its association with JS, immediately rose in ubiquity — presently it has in excess of 368 million downloads and a great many free tools in the bundle module. 

Alongside prevalence, Node.js additionally acquired the fundamental JS benefits: 

  • quick execution and information preparing; 
  • exceptionally reusable code; 
  • the code is not difficult to learn, compose, read, and keep up; 
  • tremendous asset library, a huge number of free aides, and a functioning local area. 

In addition, it’s a piece of a well known MEAN tech stack (the blend of MongoDB, Express.js, Angular, and Node.js — four tools that handle all vital parts of web application development). 

Designers Can Utilize JavaScript for the Whole Undertaking 

This is perhaps the most clear advantage of Node.js web application development. JavaScript is an unquestionable requirement for web development. Regardless of whether you construct a multi-page or single-page application, you need to know JS well. On the off chance that you are now OK with JavaScript, learning Node.js won’t be an issue. Grammar, fundamental usefulness, primary standards — every one of these things are comparable. 

In the event that you have JS designers in your group, it will be simpler for them to learn JS-based Node than a totally new dialect. What’s more, the front-end and back-end codebase will be basically the same, simple to peruse, and keep up — in light of the fact that they are both JS-based. 

A Quick Environment for Microservice Development 

There’s another motivation behind why Node.js got famous so rapidly. The environment suits well the idea of microservice development (spilling stone monument usefulness into handfuls or many more modest administrations). 

Microservices need to speak with one another rapidly — and Node.js is probably the quickest device in information handling. Among the fundamental Node.js benefits for programming development are its non-obstructing algorithms.

Node.js measures a few demands all at once without trusting that the first will be concluded. Many microservices can send messages to one another, and they will be gotten and addressed all the while. 

Versatile Web Application Development 

Node.js was worked in view of adaptability — its name really says it. The environment permits numerous hubs to run all the while and speak with one another. Here’s the reason Node.js adaptability is better than other web backend development arrangements. 

Node.js has a module that is liable for load adjusting for each running CPU center. This is one of numerous Node.js module benefits: you can run various hubs all at once, and the environment will naturally adjust the responsibility. 

Node.js permits even apportioning: you can part your application into various situations. You show various forms of the application to different clients, in light of their age, interests, area, language, and so on. This builds personalization and diminishes responsibility. Hub accomplishes this with kid measures — tasks that rapidly speak with one another and share a similar root. 

What’s more, Node’s non-hindering solicitation handling framework adds to fast, letting applications measure a great many solicitations. 

Control Stream Highlights

Numerous designers consider nonconcurrent to be one of the two impediments and benefits of Node.js web application development. In Node, at whatever point the capacity is executed, the code consequently sends a callback. As the quantity of capacities develops, so does the number of callbacks — and you end up in a circumstance known as the callback damnation. 

In any case, Node.js offers an exit plan. You can utilize systems that will plan capacities and sort through callbacks. Systems will associate comparable capacities consequently — so you can track down an essential component via search or in an envelope. At that point, there’s no compelling reason to look through callbacks.

 

Final Words

So, these are some of the top benefits of Nodejs in web application development. This is how Nodejs is contributing a lot to the field of web application development. 

I hope now you are totally aware of the whole process of how Nodejs is really important for your web project. If you are looking to hire a node js development company in India then I would suggest that you take a little consultancy too whenever you call. 

Good Luck!

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