Question

我正在尝试使用HealthKit读取数据，但在运行此代码时仍然遇到同样的问题：

func readAge() -> ( age:Int?)
{
    var error:NSError?
    var age:Int?

    // 1. Request birthday and calculate age
    if let birthDay = healthKitStore.dateOfBirthWithError(&error)
    {
        let today = NSDate()
        let calendar = NSCalendar.currentCalendar()
        let differenceComponents = NSCalendar.currentCalendar().components(.YearCalendarUnit, fromDate: birthDay, toDate: today, options: NSCalendarOptions(0) )
        age = differenceComponents.year
    }
    if error != nil {
        print("Error reading Birthday: \(error)")
    }

    return (age)
}

它给了我错误：Value of type HKHealthStore has no type dateOfBirthWithError

我无法说明为什么这不起作用，因为我已经看到了几乎完全相同的代码在其他地方工作。

Answer 1

使用Swift 2，你可以这样做：

func readAge() -> ( age:Int?)
{
   var error:NSError?
    var age:Int?

    do {
      let birthDay = try healthKitStore.dateOfBirth()
      let today = NSDate()
      let calendar = NSCalendar.currentCalendar()
      let differenceComponents = NSCalendar.currentCalendar().components(NSCalendarUnit.Year, fromDate: birthDay, toDate: today, options: NSCalendarOptions(rawValue: 0))
      age = differenceComponents.year
    } catch let error as NSError {
      print(error.localizedDescription)
    }

    return (age)
}

Answer 2

在Swift 2.0中，采用错误输出参数的方法的处理方式与Swift 1.0和Objective-C不同。方法名称仅为dateOfBirth，它会抛出NSError，您可以使用try语句处理该文件。

HKHealthStore类型的值没有类型dateOfBirthWithError

2 个答案: