Exit scene when clicking outside of modal view

Trying to exit the modal view to go back to the previous scene prior to selecting the modal view. Example attached below:

Originally I used some code from github to exit and return to the previous scene via button.

How can I select the greyed out part to exit instead?

Add a UITapGestureRecognizer to the gray view and set it up to a method that dismisses the view controller. E.g:

let tap = UITapGestureRecognizer(target: self, action: "close:")
grayView.addGestureRecognizer(tap)

Put this in your viewDidLoad() for example. Then make the action that responds to the tap, in the global scope of the view controller:

func close(tap: UITapGestureRecognizer) {
    self.presentingViewController?.dismissViewControllerAnimated(true, completion: nil)
}

If you want the view to behave differently, you can try something like this:

func close(tap: UITapGestureRecognizer) {
    let view = tap.view!
    UIView.animateWithDuration(0.5, animations: { () -> Void in
        view.backgroundColor = UIColor.clearColor()
        }) { (success) -> Void in
            self.presentingViewController?.dismissViewControllerAnimated(true, completion: nil)
    }
}

You´ll maybe have to experiment with the duration of the animation to get it right.