ResearchKit onboarding controller managing consent.

OnboardingViewController.swift

//
//  OnboardingViewController.swift
//  MyStudyApp
//
//  Created by Vincent Tourraine on 2/8/16.
//  Copyright © 2016 Shazino. All rights reserved.
//

import UIKit
import ResearchKit


class OnboardingViewController: UIViewController, ORKTaskViewControllerDelegate {

    let ConsentReviewStepIdentifier = "ConsentReviewStep"
    let consentDocument = ORKConsentDocument()
    
    @IBAction func joinButtonTapped(sender: UIButton) {
        consentDocument.title = NSLocalizedString("Research Health Study Consent Form", comment: "")

        let section1 = ORKConsentSection(type: .Overview)
        section1.summary = NSLocalizedString("Section 1 Summary", comment: "")
        section1.content = NSLocalizedString("Section 1 Content...", comment: "")

        let section2 = ORKConsentSection(type: .DataGathering)
        section2.summary = NSLocalizedString("Section 2 Summary", comment: "")
        section2.content = NSLocalizedString("Section 2 Content...", comment: "")

        let section3 = ORKConsentSection(type: .Privacy)
        section3.summary = NSLocalizedString("Section 3 Summary", comment: "")
        section3.content = NSLocalizedString("Section 3 Content...", comment: "")

        consentDocument.sections = [section1, section2, section3]

        let signature = ORKConsentSignature(forPersonWithTitle: "Participant", dateFormatString: nil, identifier: "ConsentDocumentParticipantSignature")
        consentDocument.addSignature(signature)
        
        let consentStep = ORKVisualConsentStep(identifier: "VisualConsentStep", document: consentDocument)

        let reviewConsentStep = ORKConsentReviewStep(identifier: ConsentReviewStepIdentifier, signature: signature, inDocument: consentDocument)

        let passcodeStep = ORKPasscodeStep(identifier: "Passcode")
        passcodeStep.text = "Now you will create a passcode to identify yourself to the app and protect access to information you've entered."

        let completionStep = ORKCompletionStep(identifier: "CompletionStep")
        completionStep.title = NSLocalizedString("Welcome aboard.", comment: "")
        completionStep.text = NSLocalizedString("Thank you for joining this study.", comment: "")

        let orderedTask = ORKOrderedTask(identifier: "Join", steps: [consentStep, reviewConsentStep, /*healthDataStep,*/ passcodeStep, completionStep])
        let taskViewController = ORKTaskViewController(task: orderedTask, taskRunUUID: nil)
        taskViewController.delegate = self

        presentViewController(taskViewController, animated: true, completion: nil)
    }

    // MARK: Task view controller delegate

    func taskViewController(taskViewController: ORKTaskViewController, didFinishWithReason reason: ORKTaskViewControllerFinishReason, error: NSError?) {
        print("Task run UUID: \(taskViewController.taskRunUUID.UUIDString)")

        switch reason {
        case .Completed:
            let result = taskViewController.result
            if let stepResult = result.stepResultForStepIdentifier(ConsentReviewStepIdentifier),
                let signatureResult = stepResult.results?.first as? ORKConsentSignatureResult {
                    signatureResult.applyToDocument(consentDocument)

                    consentDocument.makePDFWithCompletionHandler { (data, error) -> Void in
                        let tempPath = NSTemporaryDirectory() as NSString
                        let path = tempPath.stringByAppendingPathComponent("signature.pdf")
                        data?.writeToFile(path, atomically: true)
                        print(path)
                    }

            }

        default:
            break
        }
    }
}