Swift: Build your first app


Swift is a programming language that has quickly become one of the most popular choices for developers. In this blog post, we will show you how to build your first app using Swift. We’ll take you through the entire process, from developing a basic idea to deploying it on the App Store. So, read on if you are interested in learning how to create apps using Swift!

What is Swift?

3. Hello World! Build Your First App in Swift · Beginning iOS 16 Programming with Swift and UIKit - Sample

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Apple Inc. created Swift, a new programming language. Swift is engineered for efficiency and user-friendliness, positioning it as an ideal choice for mobile app development. Although it has its roots in the Objective-C language, developers have completely overhauled Swift to enhance its power and conciseness, providing a robust and streamlined programming tool.

To get started with Swift, you first need to download the language software from the App Store. After installing the software, you can start learning about Swift by using one of the many tutorials available online. Once you have a basic understanding of how Swift works, you can begin creating your own apps.

What are the different types of apps you can build with Swift?

There are many different types of apps you can build with Swift, but here we will focus on building a basic app using the Core ML platform. Core ML is Apple’s machine learning platform that enables developers to create sophisticated applications that can recognize and understand natural language.

To get started, open Xcode and create a new project. Select the Single View App template and name your project “HelloWorld”. Once the project has been created, open the Main.storyboard file and add a UITableView to the view controller. Add two UILabel instances to the table view, one for the text “Hello” and one for the text “World”, and set their attributes as follows:

Next, add an IBOutlet to the view controller (under the table view) and connect it to each of the label instances you just created:

Now let’s write some code to initialize the tableview and populate it with data. Add this block of code below to your view controller’s init method:

func init(storyboard: UIStoryboard) { // 1 let helloText = “Hello” // 2 let worldText = “World” self.tableView.dataSource = self // 3 tableView! <-UITableViewDataSourceWithRows(array:(NSArray *)helloText, array:(NSArray *)worldText) }

What to look for?

Here we are initializing our tableview with two arrays of strings – one containing the text “Hello” and the other containing the text “World”. Additionally, we set the table view’s data source to ourselves, ensuring that the table view will manage and keep track of populated rows by calling the tableView method. <-UITableViewDataSourceWithRows() method. Finally, we call the tableView! <-UITableViewDataSourceWithRows() method to tell the tableview to start populating its cells.

Now let’s write some code to handle user input. Add this block of code below to your view controller’s touchUpInside method:

func touchUpInside(tableView: UITableView, atIndexPath indexPath: NSIndexPath) { // 1 let cell = tableView.dequeueReusableCellWithIdentifier(“cell”, forIndexPath: indexPath) as? UICell // 2 if cell == nil { // 3 print(“ERROR: Could not find a reusable cell at indexPath”) } // 4 cell.textLabel?.text = helloText cell.textLabel?.font = UIFont(name: “AvenirNext-Regular”) }

Here we are using the UICell class to get a reference to the cell at the given indexPath. We then use the textLabel property of the cell to set the text of the helloText label and the font of the textLabel to be ArialNext-Regular. In the event that the cell we are attempting to reference cannot be located, we will output an error message and then terminate the program.

How to start with Swift?

If you’ve never programmed before, the first thing to do is to start with a language like Swift. This guide will show you how to create your first app in Swift using Apple’s Xcode development environment. Once you have created your app, you can start coding and making it more complex. There are dozens of libraries and frameworks available to help you build more sophisticated apps, and there is no end to the possibilities for what you can create with Swift. So start learning today, and see what you can create with this powerful new language!

The different tools you need to build an app with Swift

If you’re considering building an app with Swift, there are a few different tools you’ll need. Xcode is the primary development environment for iOS and macOS apps, and it’s free to download from the App Store or Mac App Store.

Swift is a programming language developed by Apple that makes developing apps with Apple products much easier. Swift shares similarities with other popular programming languages like Objective-C, but its real strength lies in its specific design for mobile app development. This focus allows for a more efficient and streamlined development process, giving developers the tools they need to create powerful and user-friendly mobile applications.

Although you need Xcode to build and develop apps with Swift, there are other tools you can use as well. For example, CodeKit is a free app that provides code snippets and IDE features for developers working in Swift. And if you want to create custom designs for your app, drawing software like Adobe Photoshop or Illustrator can be helpful.

Tips for debugging and optimizing your apps

Debugging in Swift is a bit different from other languages. If you’re not familiar with the debugging tools available in Xcode, you may find it difficult to figure out what’s wrong with your code. This guide will help you to start with debugging your apps and optimizing them for speed.

  1. Use the Quit built-in command to quit an app and return to the Xcode debugger:

Command + Q (Mac) or Control + Q (Windows)

  1. Use the Step Into command to step into a method or line of code:

Command + S (Mac) or Control + S (Windows)


If you’re keen on creating your own app, Swift is an excellent choice. It boasts immense potential and a range of features that make it an appealing option for app development. In this article, we will guide you through the necessary steps to get started and delve into some of the unique attributes that set Swift apart as a top choice for building your app. Whether you’re just starting out or want to improve your skills, learning Swift will give you the foundation needed to build successful apps.


1. What tools do I need to build my first app in Swift?

Answer: To build your first app in Swift, you need:

  • Xcode: This is the integrated development environment (IDE) for macOS that contains everything you need to create apps for Apple platforms.
  • Apple Developer Account: While you can start development without one, an Apple Developer account is required to test your app on a physical device and to publish it on the App Store.
  • A Mac computer: Xcode is only available for macOS.

2. How do I create a new project in Xcode?

Answer: To create a new project in Xcode, follow these steps:

  1. Open Xcode and select “Create a new Xcode project” from the welcome screen.
  2. Choose a template for your project. For a simple iOS app, select “App” under the iOS tab.
  3. Click “Next,” then provide a project name, organization name, and identifier. Choose Swift as the language and select the user interface you prefer (SwiftUI or UIKit).
  4. Click “Next” and choose a location to save your project.
  5. Click “Create” to set up your new project.

3. What is the difference between SwiftUI and UIKit, and which one should I use for my first app?


  • SwiftUI: Introduced in 2019, SwiftUI is a modern, declarative framework for building user interfaces across all Apple platforms. It allows you to create UIs with less code and provides live previews of your UI design.
  • UIKit: This is the traditional framework used for building iOS apps, providing a wide range of components and a well-established API. It requires a more imperative programming style.

For beginners, SwiftUI is recommended due to its simplicity and modern approach. However, if you are working on a more complex project or need features not yet available in SwiftUI, UIKit might be a better choice.

4. How do I run my app on a physical device?

Answer: To run your app on a physical device:

  1. Connect your iOS device to your Mac using a USB cable.
  2. In Xcode, select your project in the Project Navigator.
  3. Choose your connected device from the device selector at the top of the Xcode window.
  4. Go to the “Signing & Capabilities” tab in your project settings, and ensure that your Apple ID is selected as the team.
  5. Click the “Run” button (a play icon) in the Xcode toolbar.
  6. Xcode will build your app and install it on your device. If this is the first time you are running the app, you might need to trust the developer profile on your device under Settings > General > Device Management.

5. How do I add a basic user interface to my app using SwiftUI?

Answer: To add a basic user interface using SwiftUI:

  1. Open the ContentView.swift file in your Xcode project.
  2. Use the SwiftUI syntax to define your UI. For example, to create a simple view with a text label and a button:

import SwiftUI


struct ContentView: View {

var body: some View {

VStack {

Text(“Hello, World!”)




Button(action: {

print(“Button tapped!”)

}) {

Text(“Tap Me”)










struct ContentView_Previews: PreviewProvider {

static var previews: some View {




  1. Use the live preview feature in Xcode by clicking the resume button (a play icon) in the Canvas, which appears on the right side of the editor, to see your UI updates in real-time.

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