Unable to connect IBOutlet from storyboard to UIView subclass

Question

I am able to right-click and drag from my custom UIView subclass file to the storyboard elements to connect them, but unable to do so the other way around. I believe this is

Answer 1

1: Assign the class to viewController.

2: Clean your project with Shift-Alt-Cmd-K.

3: First quit Xcode and clear the derived data. going to: ~/Library/Developer/Xcode/DerivedData