Example in Swift of subclassing an ORKActiveStepViewController in Apple ResearchKit, then laying out a custom view

AppDelegate.swift

import UIKit
import ResearchKit


class DemoView: UIView {
    
}


class DemoStepViewController : ORKActiveStepViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        self.view.backgroundColor = UIColor(red:0.0, green:1.0, blue:0.0, alpha:1.0)
        
        let demoView = DemoView()
        demoView.setTranslatesAutoresizingMaskIntoConstraints(false)
        demoView.backgroundColor = UIColor(red:1.0, green:0.0, blue:0.0, alpha:1.0)
        self.customView = demoView
        self.customView?.superview!.setTranslatesAutoresizingMaskIntoConstraints(false)
        
        view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|-[demoView]-|", options: NSLayoutFormatOptions(0), metrics: nil, views: ["demoView": demoView]))
        view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|-[demoView]-|", options: NSLayoutFormatOptions(0), metrics: nil, views: ["demoView": demoView]))
    }
    
}


class DemoStep : ORKActiveStep {
    static func stepViewControllerClass() -> DemoStepViewController.Type {
        return DemoStepViewController.self
    }
}


@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        let activeStep = DemoStep(identifier: "ds_id")
        activeStep.title = "Demo Step"
        var endStep = ORKCompletionStep(identifier: "es_id")
        endStep.title = "Well done"
        endStep.text = "thank you"
        
        let task = ORKOrderedTask(identifier: "ts_id", steps: [activeStep,endStep])
        let taskViewController = ORKTaskViewController(task: task, taskRunUUID: nil)
        taskViewController.delegate = self
        taskViewController.outputDirectory = NSURL(fileURLWithPath: NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0] as! String, isDirectory: true)
        
        window?.rootViewController = taskViewController

        return true
    }
}


extension AppDelegate : ORKTaskViewControllerDelegate {
    
    func taskViewController(taskViewController: ORKTaskViewController, didFinishWithReason reason: ORKTaskViewControllerFinishReason, error: NSError?) {
        //Handle results with taskViewController.result
        taskViewController.dismissViewControllerAnimated(true, completion: nil)
    }
    
}