Pull-to-refresh in UICollectionViewController

Question

I want to implement pull-down-to-refresh in a UICollectionViewController under iOS 6. This was easy to achieve with a UITableViewController, like so:

Answer 1

I was looking for the same solution, but in Swift. Based on the above answer, I have done the following:

let refreshCtrl = UIRefreshControl()
    ...
refreshCtrl.addTarget(self, action: "startRefresh", forControlEvents: .ValueChanged)
collectionView?.addSubview(refreshCtrl)

Not forgetting to:

refreshCtrl.endRefreshing()