斯威夫特ResearchKit HealthKit QuestionStep

Question

我目前正在开发一个基于ResearchKit框架(在objective中编写)的医学研究应用。我目前正在尝试用一个HealthKit问题来创建一个调查。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]

但是，第一行将导致一个错误：

无法找到接受类型为“(ORKHealthKitCharacteristicTypeAnswerFormat:String)”的参数列表的“ORKHealthKitCharacteristicTypeAnswerFormat”初始化器

Answer 1

您需要将标识符转换为HKObjectType，这是初始化程序的预期参数类型。