Swift ResearchKit HealthKit问题步骤

Question

我目前正在swift中开发一款基于ResearchKit框架(用objective-c编写(的医学研究应用程序。我目前正在尝试创建一个带有HealthKit问题的调查。我现在的代码是：

    let genderAnswerFormat = ORKHealthKitCharacteristicTypeAnswerFormat(characteristicType: HKCharacteristicTypeIdentifierBiologicalSex)
    let genderQuestionStepTitle = "What is your gender?"
    let genderQuestionStep = ORKQuestionStep(identifier: "genderQuestionStep", title: genderQuestionStepTitle, answer: genderAnswerFormat)
    steps += [genderQuestionStep]

然而，第一行导致错误：

找不到接受类型为"(characteristicType:String("的参数列表的"ORKHealthKitCharacteristicTypeAnswerFormat"的初始值设定项

Answer 1

您需要将标识符转换为HKObjectType，这是初始值设定项的预期参数类型。