Mac上无法运行任意Xcode项目，报错“Lost connection to My Mac”求助

Hey, I’ve seen quite a few developers reporting this exact issue lately—especially with certain builds of Xcode 15.x. It’s super frustrating when it happens with every project, so let’s go through some tested fixes that have resolved it for others:

• Restart Xcode and your Mac
  I know it sounds cliché, but background process conflicts are often the culprit here. Fully quit Xcode (right-click its Dock icon and select Quit, don’t just minimize it), restart your Mac, then reopen your project and try running it again.

• Clear Xcode’s developer tool caches
  Corrupted cached data can break debugging connections. Open Terminal and run these commands one by one:

  xcodebuild -alltargets clean
  rm -rf ~/Library/Developer/Xcode/DerivedData
  rm -rf ~/Library/Caches/com.apple.dt.Xcode
  

  After running these, restart Xcode and attempt to build your project again.

• Verify privacy and security permissions
  Sometimes restricted permissions block the debug connection. Open System Settings → Privacy & Security:

  • Go to Full Disk Access and make sure Xcode is checked.
  • Navigate to Developer Tools and confirm Xcode has permission to run developer tools.

• Update Xcode to the latest stable version
  Apple regularly patches connectivity bugs in Xcode updates. Open the App Store, go to the Updates tab, or check Xcode’s Settings → General → Software Update to install the latest release.

• Reset the debug session
  If your project is still running in the background, follow the error prompt’s suggestion: go to Debug → Attach to Process and select your project’s process. If that fails, open Activity Monitor, search for your project name, force quit all related processes, then try running the project again.

If none of these steps work, try creating a brand new empty Xcode project and running it. If the error still occurs, it might be a system-level issue—consider updating your macOS to the latest version or doing a clean reinstall of Xcode.

内容的提问来源于stack exchange，提问作者Karim Masoud