PostHog integration for Swift (iOS/macOS)

This skill helps you add PostHog analytics to Swift (iOS/macOS) applications.

Workflow

Follow these steps in order to complete the integration:

1. basic-integration-1.0-begin.md - PostHog Setup - Begin ← Start here
2. basic-integration-1.1-edit.md - PostHog Setup - Edit
3. basic-integration-1.2-revise.md - PostHog Setup - Revise
4. basic-integration-1.3-conclude.md - PostHog Setup - Conclusion

Reference files

• references/EXAMPLE.md - Swift (iOS/macOS) example project code
• references/ios.md - Ios - docs
• references/identify-users.md - Identify users - docs
• references/basic-integration-1.0-begin.md - PostHog setup - begin
• references/basic-integration-1.1-edit.md - PostHog setup - edit
• references/basic-integration-1.2-revise.md - PostHog setup - revise
• references/basic-integration-1.3-conclude.md - PostHog setup - conclusion

The example project shows the target implementation pattern. Consult the documentation for API details.

Key principles

• Environment variables: Always use environment variables for PostHog keys. Never hardcode them.
• Minimal changes: Add PostHog code alongside existing integrations. Don't replace or restructure existing code.
• Match the example: Your implementation should follow the example project's patterns as closely as possible.

Framework guidelines

• Read configuration from environment variables via a PostHogEnv enum with a value computed property that calls ProcessInfo.processInfo.environment[rawValue] and fatalErrors if missing — cases should be projectToken = "POSTHOG_PROJECT_TOKEN" and host = "POSTHOG_HOST", set in the Xcode scheme's Run environment variables
• When adding SPM dependencies to project.pbxproj, create three distinct objects with unique UUIDs — a PBXBuildFile (with productRef), an XCSwiftPackageProductDependency (with package and productName), and an XCRemoteSwiftPackageReference (with repositoryURL and requirement). The build file goes in the Frameworks phase files, the product dependency goes in the target's packageProductDependencies, and the package reference goes in the project's packageReferences.
• Check the latest release version of posthog-ios at https://github.com/PostHog/posthog-ios/releases before setting the minimumVersion in the SPM package reference — do not hardcode a stale version
• If the project uses App Sandbox (macOS), add ENABLE_OUTGOING_NETWORK_CONNECTIONS = YES to the target's build settings so PostHog can reach its servers — do NOT disable the sandbox entirely

Identifying users

Identify users during login and signup events. Refer to the example code and documentation for the correct identify pattern for this framework. If both frontend and backend code exist, pass the client-side session and distinct ID using X-POSTHOG-DISTINCT-ID and X-POSTHOG-SESSION-ID headers to maintain correlation.

Error tracking

Add PostHog error tracking to relevant files, particularly around critical user flows and API boundaries.