ResearchKit dashboard controller with activity completion pie chart

DashboardViewController.swift

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

import UIKit
import ResearchKit

class DashboardViewController: UITableViewController, ORKPieChartViewDataSource {

    @IBOutlet weak var pieChartView: ORKPieChartView!

    override func viewDidLoad() {
        super.viewDidLoad()

        activityCompletionPercentage = 80

        pieChartView.dataSource = self

        pieChartView.title = NSLocalizedString("Daily Activity Completion", comment: "")
        pieChartView.showsTitleAboveChart = true

        let dateFormatter = NSDateFormatter()
        dateFormatter.dateStyle = .LongStyle
        pieChartView.text  = dateFormatter.stringFromDate(NSDate())
    }


    // MARK: Pie chart data source

    func numberOfSegmentsInPieChartView(pieChartView: ORKPieChartView) -> Int {
        return 2
    }

    enum PieChartSegment: Int {
        case Completed, Remaining
    }

    var activityCompletionPercentage: CGFloat = 0

    func pieChartView(pieChartView: ORKPieChartView, valueForSegmentAtIndex index: Int) -> CGFloat {
        switch PieChartSegment(rawValue: index)! {
        case .Completed:
            return activityCompletionPercentage
        case .Remaining:
            return 100 - activityCompletionPercentage
        }
    }

    func pieChartView(pieChartView: ORKPieChartView, colorForSegmentAtIndex index: Int) -> UIColor {
        switch PieChartSegment(rawValue: index)! {
        case .Completed:
            return UIColor.orangeColor()
        case .Remaining:
            return UIColor.lightGrayColor()
        }
    }

    func pieChartView(pieChartView: ORKPieChartView, titleForSegmentAtIndex index: Int) -> String {
        switch PieChartSegment(rawValue: index)! {
        case .Completed:
            return NSLocalizedString("Completed", comment: "")
        case .Remaining:
            return NSLocalizedString("Remaining", comment: "")
        }
    }
}

Here’s what the dashboard looks like: