Dismiss Popover after touch

In your button action on the FinalViewController, have you tried:

@IBAction func dismissMe() {
//this should tell the popover to tell the main view controller to dismiss it.
    self.presentingViewController!.presentingViewController!.dismissViewControllerAnimated(false, completion: nil)
}

I have already answer same problem over here.
There scenario is different but solution is same

You have to write code for dismiss presented view controller on completion of current view controller.
Write below code on your dismissVIew method of LastViewController.swift

 var tmpController :UIViewController! = self.presentingViewController;

        self.dismissViewControllerAnimated(false, completion: {()->Void in
            println("done");
            tmpController.dismissViewControllerAnimated(false, completion: nil);
        });

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