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 basic understanding of Swift, which is Apple's programming language. You do not need to buy expensive software — everything you need comes from Apple at no cost. What you do need is time to learn the fundamentals and patience to work through the parts that confuse you.
If you are using a Windows computer, you cannot develop iOS apps directly on that machine. You would need to either switch to a Mac or use a cloud-based service that lets you rent Mac time remotely. Most people starting out find a Mac the simpler path, even if it means borrowing one initially.
The learning curve is real. You will spend weeks understanding how iOS apps are structured before you build anything that works. This is normal. Every developer who has shipped an app went through this same phase.
Key Takeaways
- Download Xcode (Apple's free development environment) on a Mac, then learn Swift through Apple's official tutorials or third-party courses before writing your first app.
- Start with a simple project — a to-do list or a calculator — to understand how views, buttons, and data storage work together in iOS.
- Test your app constantly on a simulator (built into Xcode) and on a real iPhone if possible, because simulators do not catch every bug.
- Before submitting to the App Store, you must enroll in the Apple Developer Program (costs $99 per year) and follow Apple's review guidelines, which reject apps that crash, mislead users, or copy existing apps too closely.
- The App Store review process takes three to five business days, and Apple will reject your app if it violates their rules — read the guidelines before you submit.
Installing Xcode and setting up your workspace
Xcode is Apple's integrated development environment — the single program where you write code, design your app's layout, and test it. Open the Mac App Store, search for Xcode, and click Install. The download is large (around 12 gigabytes) and takes time, so start this while you do something else.
Once Xcode finishes installing, open it and create a new project. Xcode will ask you what kind of app you want to build — choose iOS and then App. Name your project something simple like "MyFirstApp". Xcode creates a folder with all the files you need to start.
Inside that folder you will see a file ending in .swift — this is where your code goes. You will also see a file called Main.storyboard, which is where you design what your app looks like on screen. Both matter. The .swift file is your instructions; the storyboard is your blueprint.
Learning Swift and understanding the basics
Swift is the language you use to tell iOS what to do. Apple provides free tutorials called "Develop in Swift" on their website, and they are genuinely good — they start from zero and build up. You can also use free resources like Codecademy or paid courses on Udemy, but start with Apple's official material because it is written specifically for iOS development.
Focus on these concepts first: variables (containers that hold information), functions (blocks of code that do one thing), and classes (blueprints for how your app is organized). You do not need to understand everything about Swift before you start building. You need enough to read code and make small changes.
The fastest way to learn is to build something immediately. Do not spend three months studying Swift in isolation. After one week of basics, start your first tiny project — a button that changes color when you tap it, or a text field that displays what you type. Confusion during building is where real learning happens.
Building your first app with a simple project
Start with a project that has one screen and one clear purpose. A to-do list app is ideal: it has a text field where you type a task, a button that adds it to a list, and a display of all your tasks. This teaches you how data flows through an app without overwhelming you.
In Xcode, drag a text field onto your storyboard (the visual design area). Then drag a button below it. Then drag a table view, which is the iOS component that displays lists. Each of these elements needs to be connected to your Swift code so that tapping the button actually does something.
This connection happens through something called an outlet. In Xcode, you hold Control and drag from the button on your storyboard into your Swift file. Xcode creates a line of code that links them. Then you write a function that runs when the button is tapped — this function reads what is in the text field, adds it to your list, and tells the table view to refresh and show the new task.
Test constantly. Click the Play button in Xcode to run your app in the simulator (a fake iPhone on your screen). Type something, tap the button, and watch what happens. If nothing happens, you have a bug. If it crashes, read the error message — it usually tells you exactly what went wrong.
Testing on the simulator and on real devices
The Xcode simulator is fast and convenient, but it does not catch every problem. Some bugs only show up on a real iPhone. To test on a real device, plug an iPhone into your Mac with a USB cable, select it from the device menu in Xcode, and click Play. Your app installs on the phone and runs there instead of in the simulator.
Test the things that matter: Does the app crash when you do something unexpected? Does it work on different iPhone sizes? Does it respond quickly or does it freeze? Does it use too much battery? The simulator is good for the first two; a real phone is essential for the last two.
If your app crashes, Xcode shows you the line of code that caused it. Read that line and the lines around it. Most crashes happen because you tried to use something that does not exist or you divided by zero. The error message is your guide.
Preparing your app for the App Store
Before you can submit anything to the App Store, you must enroll in the Apple Developer Program. Go to developer.apple.com, click Account, and sign up. It costs $99 per year. Apple charges this to prevent spam and to fund their support systems.
Once you are enrolled, read Apple's App Store Review Guidelines. These are the rules your app must follow. Apps get rejected for crashing, for being too similar to existing apps, for misleading users about what they do, or for collecting data without permission. Spend an hour reading these guidelines — it saves you from building something that will be rejected.
In Xcode, go to Product > Archive. This packages your app into a file that the App Store can read. Then open the Organizer window and click Distribute App. Xcode walks you through uploading to App Store Connect, which is Apple's portal for managing your apps.
Fill in your app's name, description, screenshots, and category. Write a clear description that explains what your app does in one sentence. Choose a category that matches what your app actually does. Upload at least two screenshots showing your app in use.
Understanding the App Store review process
After you submit, Apple's review team looks at your app. This takes three to five business days. They test it on real devices, check that it follows the guidelines, and verify that it does what you said it does.
If your app passes, it goes live on the App Store and people can download it. If it is rejected, Apple sends you an email explaining why. Common rejections are: the app crashes on startup, the app does not do anything useful, the app is too similar to an existing app, or the app collects location data without asking permission first.
If you get rejected, fix the problem and resubmit. You do not lose your $99 — you can submit as many times as you need. Most developers get rejected at least once. It is not a failure; it is part of the process.
What to do after your app is live
Once your app is on the App Store, people can find it, download it, and leave reviews. Read those reviews. If someone says your app crashes, that is information you need. If someone says a feature does not work, fix it and submit an update.
Updates go through the same review process as your original app, but they usually get reviewed faster. You can submit updates as often as you need to fix bugs or add features.
Track how many people download your app and how long they use it. App Store Connect shows you these numbers. If nobody is downloading it, that is information too — it might mean your description is unclear, your screenshots do not show what the app does, or your app solves a problem nobody has.
Frequently Asked Questions
Do I need an iPhone to develop iOS apps?
No, you can develop and test entirely in the Xcode simulator on your Mac. However, testing on a real iPhone catches bugs the simulator misses, especially around performance and battery use. If you do not own an iPhone, borrow one from a friend for testing before you submit to the App Store.
How long does it take to build a simple app?
A basic app like a to-do list or a calculator takes two to four weeks if you are learning Swift at the same time. If you already know Swift, it takes three to five days. The time depends on how much you already understand and how much you get stuck.
What happens if my app gets rejected by Apple?
Apple sends you an email explaining why. You fix the problem, resubmit, and it goes back into the review queue. Rejection is not permanent — it just means your app did not meet the guidelines yet. Read the rejection reason carefully and fix exactly that problem.
Can I make money from my iOS app?
Yes. You can charge money upfront (users pay before downloading), charge a subscription (users pay monthly or yearly), or show ads inside your app. Apple takes 30 percent of upfront and subscription revenue. You set the price and Apple handles the payment.
What if I want to build an app but do not know how to code?
You have two options: learn to code (which takes months but is possible), or use a no-code app builder that lets you design an app visually without writing Swift. No-code builders are faster but less flexible — you can only build what the tool allows. Most serious app developers learn to code.