Apple Health Frameworks

Nov 29 2022 · Swift 5, iOS 15, Xcode 13

Part 3: Take Advantage of CareKit & ResearchKit

12. Extract OCKOutcomeValue from ORKTaskResult

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Previous episode: 11. Make an ActiveTask Using ResearchKit. Next episode: 13. Create OCKDataSeriesConfiguration

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Part 3, Episode 13, Extract OCKOutcomeValue from ORKTaskResult

In this episode, I want to show you how to store the ORKTaskResult by creating OCKOutcomeValue.

 static func checkInSurveyOutcome(_ result: ORKTaskResult) -> [OCKOutcomeValue]? {
    let response = result.results?
      .compactMap({ $0 as? ORKStepResult })
      .first(where: { $0.identifier == IdentifierModel.checkinForm.rawValue }),
    let scaleResults = response.results?
      .compactMap({ $0 as? ORKScaleQuestionResult }),
    let musclePainAnswer = scaleResults
      .first(where: { $0.identifier == IdentifierModel.checkinMuscle.rawValue })?
    let headacheAnswer = scaleResults
      .first(where: { $0.identifier == IdentifierModel.checkinHeadache.rawValue })?
    let tirednessAnswer = scaleResults
      .first(where: { $0.identifier == IdentifierModel.checkinTiredness.rawValue })?
    let feverAnswer = scaleResults
      .first(where: { $0.identifier == IdentifierModel.checkinFever.rawValue })?
    let nauseaAnswer = scaleResults
      .first(where: { $0.identifier == IdentifierModel.checkinNausea.rawValue })?
  else {
    assertionFailure("Failed to extract answers from check in survey!")
    return nil

    var musclePainValue = OCKOutcomeValue(Double(truncating: musclePainAnswer))
    musclePainValue.kind = IdentifierModel.checkinMuscle.rawValue

    var headacheValue = OCKOutcomeValue(Double(truncating: headacheAnswer))
    headacheValue.kind = IdentifierModel.checkinHeadache.rawValue

    var tirednessValue = OCKOutcomeValue(Double(truncating: tirednessAnswer))
    tirednessValue.kind = IdentifierModel.checkinTiredness.rawValue

    var feverValue = OCKOutcomeValue(Double(truncating: feverAnswer))
    feverValue.kind = IdentifierModel.checkinFever.rawValue

    var nauseaValue = OCKOutcomeValue(Double(truncating: nauseaAnswer))
    nauseaValue.kind = IdentifierModel.checkinNausea.rawValue

    return [musclePainValue, headacheValue, tirednessValue, feverValue, nauseaValue]
 static func rangeOfMotionSurveyOutcome(_ result: ORKTaskResult) -> [OCKOutcomeValue]? {
      let motionResult = result.results?
        .compactMap({ $0 as? ORKStepResult })
        .compactMap({ $0.results })
        .flatMap({ $0 })
        .compactMap({ $0 as? ORKRangeOfMotionResult })
        .first else {
      assertionFailure("Failed to parse range of motion result")
      return nil
    var range = OCKOutcomeValue(motionResult.range)
    range.kind = #keyPath(ORKRangeOfMotionResult.range)
    return [range]