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使用 Instruments 进行性能分析

使用 SwiftUI 工具查找性能热点。

使用 Instruments 进行性能分析 是 CoddyKit 上的免费 SwiftUI Academy 课时。这是第 4 节课，共 4 节。你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。这是 SwiftUI Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 SwiftUI Academy 课程共包含 4 节课。

本课时的部分内容尚未翻译，以英文显示。

Measure Before You Tune

Guessing where an app is slow wastes time. Instruments is Apple's profiler that shows you exactly what is costing frames.

Open Instruments from Xcode

Choose Product, Profile in Xcode. It builds a release-style binary and launches Instruments attached to your running app.

Pick a Template

Instruments offers templates like Time Profiler, Animation Hitches, and SwiftUI. Each focuses on a different kind of slowdown.

The SwiftUI Instrument

The SwiftUI instrument records how often each view's body runs and how long updates take, perfect for redraw hunting.

Spot Frequent Body Calls

Look for views with a surprisingly high body count. Those are recomputing too often and are prime targets to scope down.

Hunt Hitches

The Animation Hitches tool flags frames that arrive late. Each hitch is a visible stutter your users actually feel.

Time Profiler for Hot Spots

The Time Profiler samples the call stack to show which functions burn the most CPU during a slow interaction.

Watch the Main Thread

UI must stay on the main thread. If profiling shows heavy work there, move it to a background task to free up frames.

Profile a Release Build

Always measure a release build. Debug builds add checks that distort timings and can hide the real performance picture.

Test on a Real Device

The simulator uses your Mac's power. Profile on an actual device, ideally an older one, to see true user performance.

Change, Then Re-Measure

Profiling is a loop: find a hot spot, make one fix, then re-measure to confirm it helped before moving on.

Quick Check

Which build should you profile for accurate performance numbers?

Recap: Profiling with Instruments

You learned to profile with Instruments, find frequent body calls and hitches, and re-measure each fix on a real device. 🔍

常见问题解答

「使用 Instruments 进行性能分析」课时是免费的吗？

是的 — 「使用 Instruments 进行性能分析」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 SwiftUI Academy 课程的其余内容，请升级到 CoddyKit PRO。 SwiftUI Academy 课程共包含 4 节课。

「使用 Instruments 进行性能分析」这节课中我会学到什么？

使用 SwiftUI 工具查找性能热点。你通过在浏览器中直接运行的动手代码来练习 SwiftUI Academy，全天候 AI 导师会在你学习这节课的过程中回答你的问题。

学习 SwiftUI Academy 需要有经验吗？

无需任何先前经验。CoddyKit 上的 SwiftUI Academy 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。这是第 4 节课，共 4 节。

「使用 Instruments 进行性能分析」课时需要多长时间？

大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。

我能在这节 SwiftUI Academy 课中编写并运行代码吗？

能。每节 SwiftUI Academy 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。

此课程中的所有课时

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