Have you ever created a project and then deleted for whatever reason. You decide to create a project with the same name and you notice that the application has the same code as the application deleted? Maybe you notice your hard driveis filling extremely quickly. The culprit could be Xcode 4's derived data folder. I am going to provide you with a step-by-step guide to delete some old projects in this folder.
Step 1. Open Up Finder and select Go in the menubar, then click "Go To Folder...":
Step 2. After selecting "Go To Folder..." enter ~/Library in the pane that appears:
Step 3. Navigate to the Developer folder then Xcode then Derived Data
Step 4. Delete any folders of old projects you no longer need. Be sure not to delete any projects that you still need.
Note: If you are looking for the .app debug file Xcode creates for your application it will also be in the Xcode 4 derived data folder.
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