The “Cannot find ‘\_\_\_’ in scope” error is a very common issue in Swift development, especially during the early stages of using Xcode and SwiftUI. Here are some systematic troubleshooting steps and solutions to help you quickly identify and fix the problem:

✅ 1. Check if the file is added to the correct Target

This is one of the most common causes!

✅ 2. Ensure the symbol (class/struct/function) is `public` or `internal` and within the same module

By default, Swift uses `internal` access level, meaning it’s visible only within the same module. If you’re using multiple modules (like those imported via Swift Package Manager), you may need to declare your symbol as `public`.

✅ 3. Has the file/module been properly imported?

If you're using a struct or class from another file, make sure the name is correct and the module is imported.

However, in the same project, `import` is usually not needed unless you’re working with a framework.

✅ 4. Compiler state stuck / Xcode bug

Sometimes the issue is due to Xcode being in a weird state. Cleaning the build folder or restarting Xcode may help.

✅ 5. Is there a typo or case sensitivity issue?

Swift is case-sensitive. Double-check that your type or symbol name is spelled exactly the same as its definition.

✅ 6. Group ≠ Folder

In Xcode, a “Group” does not necessarily reflect the actual folder in the file system. A file may appear in a Group but still be mislinked if the file path is incorrect.

✅ 7. Check if the issue is related to SwiftUI Previews

SwiftUI's preview area has some scope limitations. If you define a custom struct inside a preview and try to use it elsewhere (or vice versa), it may cause scope errors.

Hope this answer helps you.