类型HKHealthStore的值没有dateOfBirthWithError类型。

Question

我试图使用HealthKit读取数据，但在运行以下代码时仍然会遇到相同的问题：

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

我不知道为什么这不起作用，因为我在其他地方看到了几乎完全相同的代码。

Answer 1

在SWIFT2.0中，获取错误参数的方法与SWIFT1.0和Objective的处理方法不同。方法名只是dateOfBirth，它抛出一个NSError，您可以用try语句来处理它。

Answer 2

使用Swift 2，您可以这样做：

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)
}