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swiftui-debugging

Diagnose SwiftUI performance issues like unnecessary re-renders and slow body evaluations.

114|8|Updated Mar 4, 2025
Search Tags:#performance#debugging#optimization#lazy loading#swiftui#view rendering
One-click install
npx skills add https://github.com/gustavscirulis/snapgrid --skill swiftui-debugging-gustavscirulis
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: swiftui-debugging
Source: https://github.com/gustavscirulis/snapgrid/tree/main/.claude/skills/skills/performance/swiftui-debugging
Command: npx skills add https://github.com/gustavscirulis/snapgrid --skill swiftui-debugging-gustavscirulis

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill helps diagnose and resolve performance bottlenecks in SwiftUI applications, such as unnecessary view re-renders, slow body evaluations, and view identity problems.

Core Features & Use Cases

  • Identify Re-renders: Pinpoint which state changes cause excessive view updates using Self._printChanges().
  • Optimize Scrolling: Improve list and grid performance by identifying lazy loading mistakes.
  • Fix View Identity: Resolve issues where views lose state or animate unexpectedly due to incorrect identity management.
  • Use Case: Your SwiftUI app's scrolling list is janky and unresponsive. Use this Skill to analyze why views are re-rendering too often and how to optimize their loading.

Quick Start

Use the swiftui-debugging skill to diagnose why a specific SwiftUI view is re-rendering too often.

Frequently Asked Questions about swiftui-debugging

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
Why does my SwiftUI view re-render excessively when state changes?▼

SwiftUI view re-rendering is caused by unnecessary state updates. You can identify the exact trigger by using `Self._printChanges()` to log why a view's body is re-evaluated.

How do I fix janky scrolling performance in SwiftUI lists and grids?▼

SwiftUI scrolling jank usually stems from lazy loading mistakes. Analyze view rendering with Instruments to pinpoint slow body evaluations and optimize how views load.

How do I resolve SwiftUI view identity problems causing unexpected animations or lost state?▼

SwiftUI view identity problems occur when views lose state or animate unexpectedly. Fixing this requires analyzing view lifecycle and ensuring correct identity management during updates.

Do I need to understand ObservableObject and @Observable to debug SwiftUI performance?▼

Debugging SwiftUI performance requires understanding observation mechanisms like @Observable and ObservableObject. These mechanisms dictate how state changes propagate and trigger view updates.

What is the best way to diagnose slow body evaluations in SwiftUI applications?▼

Diagnosing slow SwiftUI body evaluations involves using debugging tools like Instruments and `Self._printChanges()` to measure rendering times and identify performance bottlenecks.

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