ResearchKit - example of ORKOrderedTask for ORKTaskViewController with ORKCompletionStep

RKOrderedTaskVC.swift

//
//  HomeVC.swift
//  LoginKit
//
//  Created by Bishal Ghimire on 2/24/16.
//  Copyright © 2016 Bishal Ghimire. All rights reserved.
//

import UIKit
import ResearchKit

class HomeVC: UIViewController {
    
    @IBOutlet weak var gettingStartedButton: UIButton!
    
    @IBAction func gettingStartedAction(sender: UIButton) {
        self.sayHellowToTheWorld()
    }
    
    func sayHellowToTheWorld() {
        // Step  - 1
        let stepStart = ORKInstructionStep(identifier: "step1")
        stepStart.title = "Hello World!"
        
        let stepQuestion1 = ORKQuestionStep(identifier: "QuestionNo1")
        stepQuestion1.title = "Are you an iOS developer ?"
        let yesNoAnswerFormat = ORKAnswerFormat.booleanAnswerFormat()
        stepQuestion1.answerFormat = yesNoAnswerFormat
        
        let stepEnd = ORKCompletionStep(identifier: "step2")
        stepEnd.title = "That is it ! :] Thanks"
        
        let task = ORKOrderedTask(identifier: "ourFirstTask", steps: [stepStart, stepQuestion1, stepEnd])
        
        let taskVC = ORKTaskViewController(task: task, taskRunUUID: nil)
        taskVC.delegate = self
        presentViewController(taskVC, animated: true, completion: nil)
    }

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
    
    override func layoutSublayersOfLayer(layer: CALayer) {
        super.layoutSublayersOfLayer(layer)
    }
    
    @IBAction func surveyTapped(sender: AnyObject) {
        let taskViewController = ORKTaskViewController(task: SurveyTask, taskRunUUID: nil)
        taskViewController.delegate = self
        presentViewController(taskViewController, animated: true, completion: nil)
    }
    
}

extension HomeVC: ORKTaskViewControllerDelegate {
    
    func taskViewController(taskViewController: ORKTaskViewController, didFinishWithReason reason: ORKTaskViewControllerFinishReason, error: NSError?) {
        self.dismissViewControllerAnimated(true, completion: nil)
        let buttonTitle: String?
        switch reason {
        case .Completed:
            buttonTitle = "Completed"
        case .Discarded:
            buttonTitle = "Discarded"
        case .Failed:
            buttonTitle = "Failed"
        case .Saved:
            buttonTitle = "Saved"
        }

        gettingStartedButton.setTitle(buttonTitle, forState: .Normal)
        
        let allResults = taskViewController.result.results
        for stepResults in allResults! as! [ORKStepResult]  {
            print("---")
            for result in stepResults.results! {
                // ORKBooleanQuestionResult
                if result.identifier == "QuestionNo1" {
                    print("found question No 1")
                }
                print(result)
            }
        }
    }
    
}