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How not to drown in someone else's code: an introduction to code style Swift
\n\nImagine: you open a colleague's pull request, and there — let userName sits next to let UserName, indentation jumps from 2 to 8 spaces, and curly braces are either on the same line or on a new one. Sound familiar? If your team writes in Swift, sooner or later you'll face chaos. Or maybe you already have.
Working in a team is not about "what's convenient for me," but about "what's clear for everyone." Code style and conventions for Swift are not bureaucracy, but a lifeline. They save hours on code reviews, reduce the number of bugs, and make code readable even after six months. In this article, I'll tell you which rules actually work, show examples in Swift, and give you a checklist for implementation in your team. Let's go!
\n\nWhy without code style Swift turns into hell
\n\nSwift is a young but strict language. It pushes you toward neatness: optionals, generics, protocols. But without agreements within the team, even perfect syntax won't save you. Here are three reasons why Swift code style is necessary for every project:
\n\n- \n
- Onboarding speed. A new developer spends days not learning the logic, but figuring out "where things are." \n
- Code review. Instead of discussing architecture, you argue about spaces. Sound familiar? \n
- Technical debt. Different styles mean different logic. One day it will blow up in production. \n
The good news: Swift conventions have already been invented. You just need to agree and automate.
\n\nNaming: Swift Naming Convention
\n\nSwift is a language with a clear philosophy: "clarity over brevity." This means getUserData() is bad, but fetchUserProfile() is good. Let's break down the main rules of Swift naming convention.
Variables and constants
\n\nUse camelCase starting with a lowercase letter. Name entities so they are clear without a comment:
\n\n// Bad\nlet n = "Alice"\nlet u = 25\n\n// Good\nlet userName = "Alice"\nlet userAge = 25\n\n// Excellent (with type)\nlet isActiveUser: Bool = true\nFor boolean variables, add prefixes like is, has, should — this is a Swift best practice.
Functions and methods
\n\nFunctions should read like a sentence. Verb + noun is the golden rule:
\n\n// Bad\nfunc change() { }\nfunc processData() { }\n\n// Good\nfunc updateUserProfile() { }\nfunc validateEmailAddress() { }\n\n// With parameters — even more readable\nfunc configureButton(withTitle title: String, color: UIColor) { }\nNote: the first parameter is often omitted when calling, but for readability it's better to specify it explicitly. This is part of the Swift code style guide from Apple.
\n\nTypes and protocols
\n\nClasses, structs, enums — PascalCase. Protocols too, but try to make them adjective names:
\n\nclass UserManager { }\nstruct UserProfile { }\nenum NetworkError { }\n\nprotocol Configurable { }\nprotocol DataPersistable { }\nFormatting: breathe evenly
\n\nThe topic of holy wars — indentation, braces, spaces. Let's set the record straight. For Swift code style, I recommend sticking to the SwiftLint standard (more on that later).
\n\nCurly braces
\n\nApple recommends placing the opening brace on the same line (K&R style). The closing brace goes on a new line:
\n\n// Correct\nif isLoggedIn {\n showDashboard()\n} else {\n showLoginScreen()\n}\n\n// Incorrect\nif isLoggedIn\n{\n showDashboard()\n}\nException — closures. There, braces can be on one line if the code is short:
\n\nlet sortedUsers = users.sorted { $0.age < $1.age }\n
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