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User Defaults

Make Xcode’s Assistant aware of your ViewModels, Views, etc

defaults write com.apple.dt.Xcode IDEAdditionalCounterpartSuffixes -array-add "ViewModel" "View" "Screen"

You can check the current value of this default using defaults read com.apple.dt.Xcode IDEAdditionalCounterpartSuffixes.

Source: Peter Friese

Prevent restoring the last open project

This is useful if you have a project that crashes Xcode on launch, if you want to run multiple Xcode versions for different projects, or if you always want to choose the project to open.

defaults write com.apple.dt.Xcode ApplePersistenceIgnoreState -bool YES

Source: Txai Wieser

Show project build times in the activity viewer

This shows the build time duration directly in the activity viewer every time you build.

defaults write com.apple.dt.Xcode ShowBuildOperationDuration -bool YES

Source: Txai Wieser

Enable Internal Debug Menu

Xcode has a secret internal debug menu. To enable it:

defaults write com.apple.dt.Xcode ShowDVTDebugMenu -bool YES
sudo touch /Applications/Xcode.app/Contents/Developer/AppleInternal/Library/Xcode/AppleInternal.plist

You can also enable a similar menu for the iOS simulator.

⚠️ Use with caution. ⚠️

Source: Khoa, @onmyway133