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Simpler categories when using OSLog


Organised logging in Swift that can be searched is simple thanks to the built-in os_log. By storing our categories as an extension on OSLog we can access them using a short syntax.

This makes categories so much easier to specify and helps with auto-completion!

extension OSLog {
    static let logAuthentication = OSLog(
        subsystem: "com.myapp.App",
        category: "Auth"
    static let logDatabase = OSLog(
        subsystem: "com.myapp.App",
        category: "Database"
    static let logNetwork = OSLog(
        subsystem: "com.myapp.App",
        category: "Network"

os_log("User signed in: %@", log: .logAuthentication, type: .default, email)
os_log("Chat messages sync complete", log: .logNetwork, type: .info)
os_log("Chat messages saved successfully", log: .logDatabase, type: .debug)

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Andrew Lord

A software developer and tech leader from the UK. Writing articles that focus on all aspects of Android and iOS development using Kotlin and Swift.