As far as how to use unwind segues in StoryBoard...
Step 1)
Go to the code for the view controller that you wish to unwind to and add this:
Objective-C
- (IBAction)unwindToViewControllerNameHere:(UIStoryboardSegue *)segue {
//nothing goes here
}
Be sure to also declare this method in your .h file in Obj-C
Swift
@IBAction func unwindToViewControllerNameHere(segue: UIStoryboardSegue) {
//nothing goes here
}
Step 2)
In storyboard, go to the view that you want to unwind from and simply drag a segue from your button or whatever up to the little orange "EXIT" icon at the top right of your source view.
There should now be an option to connect to "- unwindToViewControllerNameHere"
That's it, your segue will unwind when your button is tapped.