Xcode Interface Builder - "correct" way to delete/rename miswired IBoutlets / IBactions
Use the Connections inspector to break the connection. Then you can modify/delete the object and/or the code without having to worry.
The accepted answer is fine, but there are a few ways to do the same thing.
Method One
Right click the view in the storyboard and then click the little x by the referencing outlet.
Method Two
Right click the view name in the Document Outline. Then click the little x by the referencing outlet.
Method Three
Select the view on the storyboard and then click the Connections Inspector. Then you can click the little x to remove an outlet reference.
Extra References in Code
If you are getting outlet connections in code that you didn't add yourself see this answer.
You can find unused IBOutlets in the file in which they're declared by looking in the "gutter" of the source editor for an "unfilled hole".
