I started working with xcode a few days ago, and today I tried to connect a textview from the main storyboard to the viewcontroller, but I figured out that its not working.
For me, the solution was to click on the "View" item in the dropdown menu that shows all the subviews for the controller.
Simply clicking on the controller image on the storyboard does not appear to properly "select" the controller for drag and drop abilities, the base view must be selected.