Software⏱️ 3 min read📅 2026-06-03

How to Fix: Xcode 9 Autocomplete Not Working 100% - Partially Working

Xcode 9 autocomplete not working - partially functional. Solution involves resetting Xcode's completion suggestions.

Quick Answer: Try resetting Xcode's completion suggestions by going to Preferences > Editor > Auto Completion and selecting 'Show all members'.

📋 Table of Contents

  1. 🔍 Why This Happens
  2. 🛠️ Step-by-Step Verified Fixes
  3. 🎯 Final Words

Xcode 9.0 (9A235) is experiencing an issue with autocomplete functionality, resulting in a partially working suggestion box.

This problem affects developers who rely on autocomplete for code completion and may be frustrating to work with.

🔍 Why This Happens

  • The first main reason for this issue is a corrupted cache of suggested completions. This can occur due to a software update or a change in Xcode's configuration.
  • An alternative cause could be a misconfigured Xcode preferences file, which may need to be reset to its default settings.

🛠️ Step-by-Step Verified Fixes

Resetting the Suggested Completions Cache

  1. Step 1: Step 1: Open Xcode and go to File > Preferences > General.
  2. Step 2: Step 2: In the 'Other' dropdown menu, select 'Clear System Caches'.
  3. Step 3: Step 3: Restart Xcode and wait for it to fully load.
  4. Step 4: Step 4: Test the autocomplete functionality by typing a few lines of code.
  5. Step 5: Step 5: If the issue persists, proceed to method 2.

Resetting the Xcode Preferences File

  1. Step 1: Step 1: Open Xcode and go to File > Preferences > Locations > Derived Data.
  2. Step 2: Step 2: Click on the 'Edit' button next to 'Derived Data Location'.
  3. Step 3: Step 3: Delete the contents of the 'Derived Data' folder.
  4. Step 4: Step 4: Restart Xcode and wait for it to fully load.
  5. Step 5: Step 5: Test the autocomplete functionality by typing a few lines of code.
  6. Step 6: Conclusion: If you have followed these steps and the issue persists, try resetting your Xcode preferences file to its default settings. Additionally, ensure that your system is up-to-date with the latest software updates.

🎯 Final Words

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