ios - 在没有更多上下文的情况下使表达式类型不明确

Question

我正在尝试请求授权以使用健康应用数据。

我收到以下错误:

FirstViewController.swift:44:9: Expression type '(typesToShare: _, readTypes: Set<HKSampleType>?, completion: (_, _) -> Void)' (aka '(typesToShare: _, readTypes: Optional<Set<HKSampleType>>, completion: (_, _) -> ())') is ambiguous without more context

44:9，其中 typesToShare:nil

let healthStore: HKHealthStore? = {
        if HKHealthStore.isHealthDataAvailable() {
            return HKHealthStore()
        } else {
            return nil
        }
    }()

    let dateOfBirthCharacteristic = HKCharacteristicType.characteristicTypeForIdentifier(
        HKCharacteristicTypeIdentifierDateOfBirth)

    let biologicalSexCharacteristic = HKCharacteristicType.characteristicTypeForIdentifier(
        HKCharacteristicTypeIdentifierBiologicalSex)

    let bloodTypeCharacteristic = HKCharacteristicType.characteristicTypeForIdentifier(
        HKCharacteristicTypeIdentifierBloodType)

    let dataTypesToRead: Set<HKSampleType>? = NSSet(objects:
        dateOfBirthCharacteristic!, biologicalSexCharacteristic!, bloodTypeCharacteristic!) as? Set<HKSampleType>

    let dataTypesToShare: Set<HKSampleType>? = NSSet() as? Set<HKSampleType>

    // Making the request
    let healthData = healthStore?.requestAuthorizationToShareTypes
    (typesToShare: nil,
     readTypes: dataTypesToRead,
     completion: { (success, error) -> Void in
                                            if success {
                                                println("success")
                                            } else {
                                                println(error.description)
                                            }
    })

我是 iOS 新手，之前从未使用过 HealthKit。我该如何修复它？

Answer 1

我也是 healthKit 的新手，但尝试在 typesToShare 参数中的 nil 位置使用 dataTypesToShare 变量。并且更好地以与 dataTypesToRead 相同的方式创建 dataTypesToShare 。并且这个函数不会返回任何内容。您可以尝试使用闭包来获得完成 block 成功。

      func authorizeHealthKit(completion: ((success:Bool, error:NSError!) -> Void)!)
{   
healthStore?.requestAuthorizationToShareTypes
    (typesToShare: nil,
     readTypes: dataTypesToRead,
     completion: { (success, error) -> Void in
                                            if success {
                                                println("success")
                                            } else {
                                            println(error.description)
                                        }
})
}