No Assistant Results

Question

I am having an issue where the code associated with some of my View Controllers is not showing up in the Assistant Editor window to the right of the Storyboard. It says "No Assistant Results" where the swift code should be.

Things I have tried (There are many things):

• Cleaning project
• Deleting DerivedData
• Creating new, identical View Controllers to see if the issue was just in those particular views.(the same issue occurred)
• Deleting and Reinstalling Xcode
• Restarting my Computer.

NOTE: I also am getting a warning at the top of the editor: Internal Error has occurred, source Editor functionality is limited.

Answer 1

Ok, I've had this problem before. I couldn't remember how I solved this so I searched on Google and found this question. But this time, nothing helped me. These are the things I did. I believe the last one solved this.

1. Clear Derived Data. Go to Terminal and enter this: rm -rf ~/Library/Developer/Xcode/DerivedData
2. Quit the whole Xcode.
3. Close all tabs of Xcode and make sure to view some class files instead of Interface builder and go try again viewing assistant results.
4. Remove the assigned class to the View Controller nib you think causes the problem, then assign the class again. Boom! Solved!

Answer 2

This method worked for me: (Xcode 10.2)

1- Select the broken ViewController on the StoryBoard

2- In Identity Inspector, change the item in Class to another class (any class)

3- Change the Class back to related class

4- Save and close the project

5- Reopen the project