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I am working on an existing project where there are some blue folders that store some image references. If I create normal yellow folders, images are not read. So how do I create new blue folders?
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Blue is used to represent a "Folder Reference". There are two types of folders in Xcode: groups and folder references. You can use groups to organize files in your project without affecting their structure on the actual file system.
You can create a new group, with its own folder, directly in Xcode, but it's not at all obvious. Instead of choosing 'New Group', choose 'Add Files to “<Project>”'. Then, in the file picker dialog, click the New Folder button or press Command-Shift-N and type the name of the new folder/group.
It means they are not found on disk where your project believes they should be. Control-click and Show In Finder to see the folder location to locate the file and drag it back in to the project, and delete the bad reference.
Drag the folder to your project and make sure you select Create folder references for any added folders
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