Xcode: "Reference to NSString is ambiguous"

Question

I don't understand how such a thing can happen: I have created an Xcode project (Xcode 6) and I imported some files from a previous project (a Storyboard, the Images.xcassets file and some .h and .m files)

Now when I import some of those headers in my code, each line using a NSString reports the error "Reference to NSString is ambiguous".

Is this a known issue, how to solve that?

@trojanfoe Some .h files that come from my previous project. — Gannicus, Sep 10 '15 at 09:46
What have you tried to do to resolve this? At the very least hold down the option key and choose Product > Clean Build Folder… — Jeffery Thomas, Sep 10 '15 at 10:17
http://stackoverflow.com/questions/31199442/reference-to-is-ambigous-error-in-xcode/41765279#41765279 — Mohit Tomar, Jan 20 '17 at 13:54

score 0 · Answer 1 · answered Sep 10 '15 at 10:48

0

Reason: Engineering Index is broken, Rebuild index

Workaround: Xcode -> Window -> Organizer -> select the project, find Derived Data, click on the back of Delete, and then restart XCode can.

answered Sep 10 '15 at 10:48

Colin

46
3

That solved the issue for about a minute but it appeared again. Same thing happen when I clean the project. – Gannicus Sep 10 '15 at 11:31
1. Clean the project 2. Deleting everything inside '~/Library/Developer/Xcode/DerivedData/ModuleCache/' (if button inside the organizer window did not work) 3. Clean once more 4. Build project – Colin Sep 10 '15 at 11:37

Xcode: "Reference to NSString is ambiguous"

1 Answers1

Linked