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Charles Wiltgen
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ContinuousClock().timer(interval:) does not exist — compile-verified against the SDK. AsyncTimerSequence ships in swift-async-algorithms, not the standard library; examples now import AsyncAlgorithms and the section states the package dependency, iOS 16 floors, and that .repeating(every:) defaults to SuspendingClock (corroborated against the package source). Companion reference docs page carried the same phantom API in its Example Prompts and What's Covered index — fixed.
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Timer Patterns Reference
Complete API reference for iOS timer mechanisms — Timer, DispatchSourceTimer, Combine Timer.publish, AsyncTimerSequence, and Task.sleep.
When to Use This Reference
Use this reference when:
- Looking up specific timer API syntax or parameters
- Understanding DispatchSourceTimer lifecycle state machine
- Choosing the right timer API for your use case
- Checking platform availability for timer APIs
- Debugging timer behavior with LLDB commands
Example Prompts
- "What's the API for Timer.publish in Combine?"
- "How do I schedule a DispatchSourceTimer with leeway?"
- "What RunLoop modes are available for Timer?"
- "How do I run a repeating async timer with AsyncTimerSequence?"
- "What's the platform availability for AsyncTimerSequence?"
What's Covered
- Timer API (scheduledTimer, tolerance, RunLoop modes, invalidate lifecycle)
- DispatchSourceTimer API (makeTimerSource, schedule, activate, suspend/resume/cancel, state machine)
- Combine Timer (Timer.publish, autoconnect, RunLoop mode parameter)
- AsyncTimerSequence (swift-async-algorithms package, ContinuousClock/SuspendingClock, structured concurrency)
- Task.sleep patterns (one-shot delays vs repeating timers)
- LLDB timer inspection commands
- Platform availability matrix
Documentation Scope
This page documents the axiom-integration skill — the API reference Claude uses for timer syntax and lifecycle details.
For decision trees and crash prevention: See Timer Safety Patterns for when to use which timer API and how to prevent DispatchSourceTimer crashes.
Related
- Timer Safety Patterns – Decision trees, crash patterns, SafeDispatchTimer wrapper (use this for "which timer should I use?" questions)
- Energy Optimization – Timer as energy subsystem (tolerance, coalescing)
- Memory Debugging – Timer retain cycle as leak pattern
Resources
Skills: axiom-integration, axiom-performance