Improving the usability

So far, the app works and does what it is supposed to do, but we can still improve it. We should give the user the opportunity to return to the first screen and repeat the procedure with another video. Return to InitialViewController and add the following method that will reload the videos while returning to this view controller:

    @IBAction func unwindToMainView(segue:UIStoryboardSegue) {
        self.initAssets()
    }

Now, go to the storyboard and control-drag from the RecorderViewController icon to its exit icon, as shown in the following screenshot:

After releasing the mouse button, select the unwindToMainView: option. A new component with the Unwind segue to Scene Exit Placeholder phrase will appear on the document's outline. Click on it and go to its attribute inspector. In the Identifier field, set it to exitrecorder, as you can see in the following screenshot:

Now we can unwind to the main screen. To do it, we just need to return to the merge method and call...