Swift2 我在Swift 2中出错了；类型'；NSCalendarUint'；没有成员'；年历单位'&引用；？

我尝试使用HealthKit读取数据，但在运行此代码时不断遇到一些问题：

do {
    let birthDay = try healthKitStore.dateOfBirth()
    let today = NSDate()
    let calendar = NSCalendar.currentCalendar()
    let differenceComponents = NSCalendar.currentCalendar().components(.YearCalendarUnit, fromDate: birthDay, toDate: today, options: NSCalendarOptions(0) )
    age = differenceComponents.year
} catch {
    print("Error reading Birthday: \(error)")
}

错误是

类型“NSCalendarUint”没有成员“YearCalendarUnit”

NSCalendarUnit

是一种结构类型。

⌥-单击

NSCalendar

并向下滚动。在页面底部，您将看到

NSCalendarUnit

选项设置类型

所有值都已更改为更方便的值，如

.Year

，

.Day

，

.Hour

let differenceComponents = NSCalendar.currentCalendar().components(NSCalendarUnit.Year, fromDate: birthDay, toDate: today, options: NSCalendarOptions(rawValue: 0))