iOS 8 - performSegueWithIdentifier loads view but doesn't show it the first time

I have a Tab Bar application, and one of the tabs, which contains a Table View, segues into a third view when a table cell is pressed. The view controller acts as a delegate for the UITableView, and I trigger the segue programatically as follows:

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    println("cell tapped, starting segue")
    performSegueWithIdentifier("showDetails", sender: self)
}

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    println("prep for segue")
    // TODO - more code here
}

Finally, I set up the following code to debug the problem with the third view:

class DetailsViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        println("did load")
    }
    override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)
        println("will appear")
    }
}

The problem is that when I press a table cell for the first time, the viewWillAppear function never gets called until I interact with the UI in some way (e.g. just a tap anywhere on the screen). The view that I want to segue into doesn't show up, as if the screen didn't get refreshed. However, when I tap the screen, the whole animation runs and I can segue as intended. This is my output when I tap a cell:

cell tapped, starting segue
prep for segue
did load

I tried to find solutions online, but all the issues I found it seems to just not work at all. In my case, it is working, but not immediately.

In case it helps, here's a screenshot of my storyboard: