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I faced the same problem, after I updated xcode to version 13.2.1 I had a problem with autocomplete. I tried reinstalling xcode but it didn't work for me. I remembered that I had previously enabled code build acceleration (defaults write com.apple.dt.XCBuild EnableSwiftBuildSystemIntegration 1), which was introduced with xcode 13.2. I disabled this method, via the command line and it helped me, autocomplete reappeared. In my case, autocomplete did not work only in projects that I create with xcode 13.2.1. In the projects that were created earlier, everything worked fine. If you encounter a similar problem, try writing to the command line and reloading xcode. defaults write com.apple.dt.XCBuild EnableSwiftBuildSystemIntegration 0