Some files not showing in Xcode project navigator

Question

I added two files and a core data model to my Xcode project yesterday, and after saving I went off, but came back this morning to find they are not there. When I look in the project files, they are still there, but they, are not showing in the project navigator.

When I build and run the app it doesn't crash (As in when I go on the views with one of those files, it recognises the file.)

Is this a common problem and is there a way to fix this?

Thanks in advance, any help is much appreciated

Edit: I do get this error though:

Failed to load model named [Project_name]
CoreData: error:  Failed to load model named [Project_name]

Answer 1

Ok I figured it out, and will post here in case anyone else has the same problems.

1) Using Finder, take the files out of your project.

2) Then drag them from finder into the project navigator, and do any actions needed e.g. making groups e.t.c. to restore the state it was in before.

3) Save the project, close it and reopen it to check that everything is all good.

Answer 2

Just a little more to add is that when you drag and drop the files in the Xcode project also remember to tick and add the dependencies related to that file as Xcode itself Will add all the dependencies with it.

**

Do not directly put anything in the folder and open As Xcode will not add files in that way

**, you have to have Xcode open and then drag and drop so that it can add other files related to that file.