Axiom iOS Hang Diagnostics FAQs

Question 1

What defines a hang in an iOS app?

Accepted Answer

A hang is specifically defined as a period where the main runloop cannot process events for more than 1 second, making the app completely unresponsive to user input.

Question 2

Does this skill cover animation stutters?

Accepted Answer

While it focuses on hangs (delays over 1s), it provides a clear distinction between hangs, hitches (animation stutters), and lag, ensuring you use the correct tool for each performance issue.

Question 3

Which tool should I use to fix a blocked main thread?

Accepted Answer

For a blocked thread (low CPU usage during a hang), System Trace is the preferred tool as it reveals thread states, lock contention, and semaphore waits.

Question 4

How does this skill help with Xcode Organizer reports?

Accepted Answer

It provides a systematic workflow to interpret aggregated call stacks from production, helping you determine if your code is performing too much work or waiting on a blocked resource.

Question 5

What is the iOS Watchdog and why does it kill my app?

Accepted Answer

The system watchdog monitors app responsiveness during key transitions like launch or backgrounding; if the main thread is blocked beyond a specific limit (e.g., 20s for launch), the system terminates the process.

Axiom iOS Hang Diagnostics

主要功能

使用场景

Axiom iOS Hang Diagnostics

主要功能

使用场景