What you need before you start building

Building an iOS app requires three things: a Mac computer running macOS, Apple's development tools (which are free), and a plan for what your app will do. You cannot build iOS apps on Windows or Linux — Apple requires Xcode, which only runs on macOS. If you do not have a Mac, you will need to buy or borrow one, or use a cloud Mac service like MacStadium or Paperspace.

You also need to decide whether to build with Swift (Apple's modern programming language) or Objective-C (the older language still used in some existing apps). Swift is faster to learn and is what Apple recommends for new projects. Most tutorials and job postings now assume Swift, so that is the practical choice unless you are maintaining an existing Objective-C codebase.

Finally, you need an Apple Developer Account, which costs $99 per year. This account lets you test your app on real devices and submit it to the App Store. You can build and test in the simulator (a fake iPhone that runs on your Mac) for free, but you cannot publish without the paid account.

Key Takeaways

  • You need a Mac, Xcode (free), Swift knowledge, and an Apple Developer Account ($99/year) to build and publish iOS apps.
  • Start by learning Swift through Apple's free resources or paid courses, then build a small project to practice before attempting anything complex.
  • Xcode is the only tool you need — it includes the code editor, simulator, and everything required to test your app on your Mac.
  • The App Store review process takes one to three days, and Apple rejects apps that crash, copy other apps too closely, or violate their guidelines.
  • Most beginner apps fail because they try to do too much — start with a single clear feature and expand only after that works.

Learning Swift and setting up Xcode

Download Xcode from the Mac App Store — it is free and takes 10 to 15 minutes depending on your internet speed. When you open it for the first time, it will ask to install additional components. Let it finish. Xcode is large (over 40 GB) but you only install it once.

Before you open a blank project, spend time learning Swift. Apple publishes a free book called "The Swift Programming Language" on their website, and it covers everything from variables and loops to objects and error handling. If you prefer video, Stanford University offers a free course called "Developing Apps for iOS" that teaches Swift and Xcode together. Paid courses on Udemy or Coursera cost $10 to $50 and often move faster, but the free resources are complete.

Practice by building small programs in Xcode's playground feature — a space where you can write Swift code and see results instantly without building a full app. Write a program that calculates a tip, converts temperatures, or stores a list of tasks. These exercises teach you how Swift works before you deal with buttons, screens, and user interaction.

Building your first app with Storyboard or SwiftUI

Xcode offers two ways to build the visual part of your app: Storyboard (the older method, still widely used) and SwiftUI (Apple's newer approach). Storyboard uses a visual editor where you drag buttons and text fields onto a screen. SwiftUI uses code to describe what the screen looks like. Most tutorials for beginners use Storyboard because it is more visual, but SwiftUI is becoming the standard for new projects.

Start a new project in Xcode by going to File > New > Project. Choose "App" as the template. Name your project, set the organization identifier (usually your website domain reversed, like "com.yourname.appname"), and choose Storyboard or SwiftUI. If you are unsure, pick Storyboard — it is easier to see what you are building.

In Storyboard, you will see a blank screen called a View Controller. Drag a button from the Object Library (the panel on the right) onto the screen. Double-click the button to change its text. Drag a text label below it. Now connect these to your code: right-click the button and drag to your Swift file to create an action (a block of code that runs when someone taps the button). Write code inside that action to change the label's text when tapped.

This is the core pattern: design the screen in Storyboard, connect it to Swift code, and write the logic that makes it respond to taps and other interactions. Most beginner apps are just buttons, labels, and text fields connected to simple Swift functions.

Testing your app on the simulator and real devices

The simulator is a fake iPhone that runs on your Mac. Press the Play button in Xcode (or Command-R) to build and launch your app in the simulator. You can tap buttons, type text, and see exactly how your app behaves. The simulator is fast and free, and it is where you will spend most of your testing time.

To test on a real iPhone, connect it to your Mac with a USB cable. In Xcode, select your device from the dropdown menu at the top (instead of "iPhone 15 Simulator" or whatever simulator is listed). Press Play. Xcode will install your app on the phone and launch it. The first time you do this, you may need to trust the developer certificate on your phone — go to Settings > General > Device Management and tap your Apple ID to trust it.

Testing on a real device is important because the simulator does not perfectly match real hardware. Apps sometimes run fast in the simulator but slow on an actual phone. The simulator also cannot test features like the camera, location, or push notifications — you need a real device for those. If you do not have an iPhone, the simulator is enough to learn, but you will need a real device before submitting to the App Store.

Submitting your app to the App Store

Before you submit, your app must not crash, must follow Apple's Human Interface Guidelines (their design rules), and must do what your description says it does. Read the guidelines on Apple's website — they cover things like how buttons should look, how navigation should work, and what features require user permission.

To submit, you need an App Store Connect account (part of your Apple Developer Account). Go to appstoreconnect.apple.com, sign in, and click "My Apps." Create a new app by filling in the app name, bundle ID (matches what you set in Xcode), and category. Upload screenshots of your app running, write a description, set a price (free or paid), and upload your app binary (the compiled version of your code).

Xcode can upload the binary for you. Go to Product > Archive, wait for it to finish, then click "Distribute App." Choose "App Store Connect" and follow the prompts. Xcode will upload your app to Apple's servers. Within one to three days, Apple's review team will test it. They will either approve it (and it goes live on the App Store) or reject it with a reason. Common rejections are crashes, misleading descriptions, or copying another app too closely.

If your app is rejected, fix the problem and resubmit. You can submit as many times as needed. Most first apps are rejected at least once — this is normal and not a reflection on you.

Common mistakes beginners make

The biggest mistake is trying to build too much at once. New developers often start with an idea for a complex app with many features, a database, and user accounts. They get stuck halfway through and never finish. Instead, build the smallest version that demonstrates your idea — a calculator, a to-do list, a weather display. Get that working, submit it, and add features in the next version.

The second mistake is not testing on a real device. The simulator is convenient, but real iPhones behave differently. An app that feels fast in the simulator might be slow on an older phone. Test on the actual device you are targeting, or at least on a device similar to it.

The third mistake is ignoring Apple's guidelines. Read them before you design your app. If your app uses the camera, location, or contacts, you must ask the user for permission — Apple will reject it if you do not. If your app has a login screen, it must work without requiring a specific email or password that only you know. These rules exist to protect users, and Apple enforces them strictly.

Resources to keep learning

After your first app, you will want to learn more advanced topics: how to store data, how to fetch information from the internet, how to handle different screen sizes, and how to make your app faster. Apple's documentation is free and detailed — search "Swift documentation" or "UIKit documentation" (UIKit is the framework that powers most of the visual parts of iOS apps). Ray Wenderlich publishes free tutorials on iOS development that are clear and up-to-date. Hacking with Swift is another free resource with written tutorials and video courses.

Join communities like r/iOSProgramming on Reddit or the Swift Forums on Apple's website. Other developers answer questions and share code. When you get stuck, these communities are faster than searching Google.

Frequently Asked Questions

Can I build iOS apps without a Mac?

No. Xcode only runs on macOS, and Apple does not offer an alternative. You can use a cloud Mac service like MacStadium if you do not want to buy a Mac, but you will still need to rent one.

How long does it take to build a simple app?

A very simple app (a button that changes text, a calculator, a timer) takes one to two weeks if you already know Swift. If you are learning Swift at the same time, expect two to three months of part-time work. The time depends on how much you already know and how much time you spend each week.

Do I have to pay the $99 developer fee every year?

Yes, if you want to publish on the App Store or test on real devices. The fee renews every 12 months from the date you first paid it. You can build and test in the simulator for free without paying, but you cannot publish or use a real iPhone.

What happens if Apple rejects my app?

Apple sends you a reason for the rejection. Common reasons are crashes, misleading descriptions, or violating their guidelines. You fix the problem, resubmit, and Apple reviews it again. There is no limit to how many times you can resubmit. Most rejections are fixable in a few hours.

Should I learn SwiftUI or Storyboard?

SwiftUI is the future and is what Apple recommends for new projects. Storyboard is still used in many existing apps and is easier to learn visually. If you are just starting, Storyboard is a safer choice because more tutorials use it. Once you understand the basics, learning SwiftUI is straightforward.