Language focus

AI code review for Swift

Swift code spans SwiftUI views, UIKit controllers, and server packages where value semantics and actor isolation decide correctness. CodeCritic reviews your diff with attention to concurrency boundaries, optional force-unwraps, and ARC cycles that build cleanly yet crash on edge inputs.

iOS & macOSSwiftUISwift concurrencyPaste or GitHub PRFree tier
GitHub code review

Online paste review · All languages

Review focus

What we look for in Swift changes

The Swift compiler enforces much of concurrency; it cannot catch every `@MainActor` assumption violated by a background callback or a `Task` that outlives its view. The model focuses on those lifecycle gaps.

  • Concurrency: data races across actors, `nonisolated` escapes, detached tasks without cancellation, and `await` missing on throwing async boundaries.
  • Optionals and force unwraps: `!` after refactors, implicitly unwrapped outlets paired with new nil paths, and `try!` masking recoverable errors.
  • SwiftUI state: `@State` owned by the wrong view, missing `Identifiable` stability, environment objects recreated per navigation, and animations fighting state updates.
  • Memory and ARC: strong reference cycles in closures, delegates not marked weak, and Combine pipelines retained after view dismissal.
  • Codable and networking: decoding failures swallowed, date strategies mismatched with server formats, and trust-all certificate delegates left in production builds.
  • UIKit bridges: storyboard segues passing unchecked data, keychain items accessible after backup restore, and background task expiration handlers not calling `setTaskCompleted`.

AI review does not replace App Store privacy review, penetration testing, or Instruments profiling. Use it as a fast second pass; feature owners still approve merge.

Stacks

Common Swift codebases we see

SwiftUI apps

Navigation stack state loss, sheet presentation without dismissal guards, and accessibility labels missing on custom controls.

UIKit & hybrid

Coordinator leaks, child view controller containment mistakes, and SwiftUI `UIViewControllerRepresentable` update cycles causing layout thrash.

Packages & server

Public API breaking changes without availability attributes, Foundation networking on Linux differing from Apple platforms, and Vapor middleware ordering.

Workflow

Run a Swift review in minutes

Paste a view, view model, or service type to validate signal, then connect GitHub when the team wants PR-level automation.
  1. 1

    Paste or connect a repo

    Sign up, open a new review, and paste a SwiftUI view, coordinator, or Vapor handler. Connect GitHub to target PRs with Swift changes.

  2. 2

    Let detection set context

    CodeCritic reads imports and property wrappers so findings reference SwiftUI, UIKit, or server frameworks you actually ship.

  3. 3

    Triage by severity

    Issues arrive grouped with short explanations. Fix concurrency, data loss, and crash paths before style suggestions.

  4. 4

    Scale to PR comments

    Enable GitHub integration so the same engine comments on pull requests your team already merges through.

How to use it

Swift review without drowning in noise

Paste a coherent slice: a view with its view model, or a network client with the model types it decodes - not a lone protocol with no adopters.

Keep SwiftLint and compiler warnings-as-errors in CI. CodeCritic targets reasoning: "this task survives view teardown" beats line length.

Note minimum OS version and strict concurrency settings in the PR when pasting code that uses newer Swift features behind availability checks.

GitHub integration keeps feedback on the diff your team already discusses in review comments.

Paid tiers add API automation when every push to a shared package should trigger the same scan.

Reproduce crash and concurrency findings on device or simulator - AI can miss Objective-C selectors bridged into Swift without obvious annotations.

Details: Integrations, Limitations, Pricing.

Code patterns

Swift examples worth reviewing

Small slices from real PRs. Paste similar units in the browser or run on the GitHub diff that contains them.

Force unwrap URL

let url = URL(string: userInput)!

Sample findings

Typical Swift review output

Blocking

Trap on malformed URL

Force unwrap crashes the app when userInput is not a valid URL. Return optional or validation error instead.

Before

URL(string: userInput)!

Suggested direction

guard let url = URL(string: userInput) else { throw ValidationError.invalidURL }

Illustrative patterns from real review categories. Your output depends on diff size, language, and context.

Before you merge Swift

  • Context size: Include view models and coordinators when UI changes depend on navigation or async loading state.
  • Concurrency: Verify new async entry points respect actor isolation and cancel when views disappear.
  • Secrets: Ensure API keys live in Keychain or xcconfig, not hardcoded strings or logged URLs.
  • Human owner: Assign a reviewer who knows the release channel and entitlement changes the diff touches.

FAQ

Swift code review FAQ

Yes. Reviews run on Swift source across Apple platforms and server packages. Include framework imports for UI-specific feedback.

Try AI code review on your Swift

Start free in the browser, then connect GitHub when the team wants reviews on every pull request.

How it works