computer science

IOS 18

IOS 18 is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand IOS 18 rather than just read about it. In short: iOS 18 is the eighteenth major release of Apple's iOS operating system for the iPhone. It was announced on June 10, 2024, at the 2024 Worldwide Developers Conference (WWDC), and made publicly available on September 16, 2024, as a free software update for supported iOS devices.

Key takeaways

IOS 18 belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect IOS 18 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of IOS 18 from memory before moving on to harder problems.

Reference excerpt

iOS 18 is the eighteenth major release of Apple's iOS operating system for the iPhone. It was announced on June 10, 2024, at the 2024 Worldwide Developers Conference (WWDC), and made publicly available on September 16, 2024, as a free software update for supported iOS devices. It is the direct successor to iOS 17 and was announced alongside iPadOS 18, macOS Sequoia, watchOS 11, visionOS 2, and tvOS 18. iOS 18 is the last version of iOS that features a flat design style, as that design style was replaced with Liquid Glass in its successor, iOS 26, which was released on September 15, 2025.

Features

Apple Intelligence

The Apple Intelligence platform is available in iOS 18.1 and beyond, on the iPhone 15 Pro and iPhone 15 Pro Max models as well as the iPhone 16 and iPhone 16 Pro models. Apple Intelligence adds artificial intelligence (AI) capabilities and large language model integrations to Siri and other operating system functions, such as the Photos app and image creation tools. Apple's Intelligence features are set to be introduced gradually across several forthcoming updates. These features were not included in the initial release of the iPhone 16 models.

Calculator

iOS 18's calculator introduces Math Notes, a new feature that allows users to perform and track calculations on separate sheets, solve mathematical equations, and plot functions on graphs. With integrated handwriting recognition, Math Notes automatically evaluates user input and displays the results in their own handwriting. The redesigned Calculator app, now shared between iOS and iPadOS, marks the first time an official calculator has been available for iPad.

Messages

iOS 18 supports Rich Communication Services (RCS) on supported conversations, including support for read receipts and higher-quality multimedia sharing across various platforms. As with SMS, it is designated with green message bubbles and buttons to distinguish it from blue iMessage conversations. Availability of RCS messaging varies by carrier availability and compatibility. Apple previously refused the adoption of RCS in iOS. In 2022, after being questioned about RCS potentially coming to iPhone to increase compatibility with Android, Tim Cook said that iPhone users were not expressing interest in RCS and instead suggested that a solution would be to switch to an iPhone to use iMessage. The person who asked the question followed up, explaining that they use an iPhone while their mom uses an Android phone, to which Tim Cook jokingly replied "Buy your mom an iPhone" to large controversy. The quote was later cited in an anti-trust lawsuit against Apple Inc. filed by the United States Department of Justice. iOS 18.4 added RCS support for more carriers. In iMessage, animated effects can be applied to any letter, word, or phrase, and text formatting such as bold, italic, underline, and strikethrough can be applied to any part of the text as well. Both can be used simultaneously but cannot be used with the same selected text, however.

Photos

iOS 18 includes a significant redesign of the Photos app. Slideshows known as collections are now automatically generated and visible at the top of the screen. Support for encoding and decoding the ISO 21496-1 gain map standard for HDR images was added, which allows for cross-platform HDR compatibility while remaining backwards compatible with SDR displays. This redesign has led to backlash from many users who find it too confusing and is said to be the most controversial change in iOS 18.

Home screen iOS 18 allows users to customize the icon color as well as the icon position and size on the home screen. A toggle to activate dark mode icons for first-party apps and many third party ones was implemented. Previous iOS versions arranged icons on a preset grid, but now users can place them anywhere. In iOS 18, app widgets and some apps can now be enlarged or reduced as desired. Many system icons were given gradients or had them removed. In iOS 18, applications can now be locked or hidden. Locked apps require passcode or biometric authentication to run. Hidden apps are moved to a designated "Hidden" folder in the App Library; accessing that folder requires passcode or biometric authentication. Hidden apps do not show in other places on the phone such as Siri Suggestions and the Settings app. In iOS 18.1, a new feature was introduced which enables users to edit the iPhone home screen through iPhone Mirroring.

Control Center

iOS 18 comes with a redesign to the Control Center, allowing for multiple pages of controls, resizable buttons, and third-party controls.

Passwords

Apple introduced the Passwords app, a password manager aimed at simplifying password management for websites, applications, Wi-Fi, and verification codes. This new app is heavily inspired by and replaces the Passwords section that was previously found in Settings, with the addition of Wi-Fi passwords. All existing passwords and codes in Settings are automatically moved to the Passwords app upon updating.

recoveryOS iOS 18 includes recoveryOS for the iPhone 16 series that allows users to restore firmware wirelessly from another iPhone 16. While all iPhone devices running iOS 18 are able to recover and restore firmware for an iPhone 16 device, wireless firmware recovery can only work between iPhone 16 devices.

Others

With iOS 18.1, iOS allows the detection and display of battery health information of a non-Apple battery. On devices with an OLED display, there is a bulge animation when a hardware button is pressed. With iOS 18.2, users are able to share a link with others or airlines to track the location of AirTags or other accessories in the Find My app. Reports from law enforcement suggested that a new security feature was added that would reboot iPhones after 72 hours of inactivity to make it harder to break into, which researchers were able to confirm while looking at the code for iOS 18.1. iOS 18.2 allowed app developers such as Truecaller to add real-time Caller ID and spam-blocking. With iOS 18.5, Apple introduced the 2025 Pride wallpaper. This update also fixed several security vulnerabilities.

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with IOS 18

Start with the simplest possible case. Write down what IOS 18 claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to IOS 18 before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about IOS 18 ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of IOS 18

In research: IOS 18 appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses IOS 18 in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: IOS 18 is common in secondary-school and first-year university syllabi. It links to neighbouring topics 2024 software, Applications of artificial intelligence, IOS, so understanding it makes those chapters shorter.
In everyday life: Look for IOS 18 outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study IOS 18 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what IOS 18 means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain IOS 18 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is IOS 18 in simple terms?

Why does IOS 18 matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study IOS 18?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on IOS 18.