Swift 2.0日历组件错误 [英] Swift 2.0 calendar components error

问题描述

您好我在swift 2.0中遇到此错误

Hi I get this error in swift 2.0

无法使用类型'的参数列表调用'components'（NSCalendarUnit，fromDate：NSDate？，toDate：NSDate？ ，options：nil）'

Cannot invoke 'components' with an argument list of type '(NSCalendarUnit, fromDate: NSDate?, toDate: NSDate?, options: nil)'

var hoy = dataFormatter.stringFromDate(NSDate())
        var despues = dataFormatter.stringFromDate(fecha)
        var calHoy = dataFormatter.dateFromString(hoy)
        var calcDesp = dataFormatter.dateFromString(despues)
        let cal = NSCalendar.currentCalendar()
        let unit:NSCalendarUnit = .Day
        let components = cal.components(unit, fromDate: calcDesp, toDate: calHoy, options: nil) 

推荐答案

从Swift 2开始， NS_OPTIONS （例如 NSCalendarOptions ）作为 OptionSetType
映射到Swift，它提供类似集合的接口。特别是，无选项
现在可以指定为 [] 而不是 nil ：

As of Swift 2, NS_OPTIONS (such as NSCalendarOptions) are mapped to Swift as a OptionSetType which offers a set-like interface. In particular, "no options" can now be specified as [] instead of nil:

let components = cal.components(unit, fromDate: calcDesp!, toDate: calHoy!,
                               options: []) 

另见 Swift 2.0-Binary Operator|"无法应用于两个UIUserNotificationType操作数
以及最近添加的如何在Swift中创建NS_OPTIONS样式的位掩码枚举？以获取更多信息。

See also Swift 2.0 - Binary Operator "|" cannot be applied to two UIUserNotificationType operands and the recently added answers to How to create NS_OPTIONS-style bitmask enumerations in Swift? for more information.

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