Modern Swift Formatting & SwiftUI Indentation Standards
Writing idiomatic Swift for iOS, macOS, watchOS, and server-side Swift requires clear structural clarity. Between heavy reliance on trailing closures, deep declarative SwiftUI ViewBuilder hierarchies, guard-let unwrapping, and async actors, unformatted code degrades readability quickly. Enforcing Apple-standard 4-space indentation ensures consistent rendering across Xcode, VS Code, and terminal diffs.
Standard 4-Space Indentation
Apple's official Swift conventions standardize on 4 spaces per nesting level. Hard tabs are avoided to guarantee identical cross-platform visual alignment.
Declarative SwiftUI Hierarchies
SwiftUI relies on chained modifiers and nested stacks (VStack, HStack, ZStack). Proper indentation provides immediate visual feedback on container boundaries and subview ownership.
Swift Style Guidelines: Official Standards vs. Common Habits
| Construct | Unformatted / Irregular | Beautified Swift Standard | Convention Rule |
|---|---|---|---|
| SwiftUI View Body | var body: some View { VStack { Text("Hello") } } | var body: some View { VStack { Text("Hello") } } | 4 spaces per nested view stack and property wrapper body. |
| Guard-Else Early Exit | guard let id = user.id else { return } | guard let id = user.id else { return } | Opening brace stays on the same line as else. |
| Trailing Closure | items.map({ item in item.name }) | items.map { item in item.name } | Omit parentheses when final argument is a trailing closure. |
Frequently Asked Questions
What indentation style does this Swift formatter follow?
By default, it follows Apple's official Swift API design guidelines and swift-format standards, utilizing 4 spaces per indentation level without hard tabs.
Does it format SwiftUI view bodies and trailing closures correctly?
Yes. It balances nested delimiter hierarchies ({, }, (, ), [, ]), aligning nested ViewBuilders (VStack, HStack, List), modifiers, and closures cleanly.
Is my proprietary Swift source code sent to a remote server?
No. The formatting engine operates 100% locally in your browser using JavaScript lexical parsing. Zero code or diagnostic telemetry is sent over the network.