Ios Swift 2.0:无法将NSDateComponents转换为NSCalendarUnit

以下是接收问题代码的代码行：

let CompetitionDayDifference = userCalendar.components (dayCalendarUnit, fromDate: currentDate!, toDate: competitionDay, options: nil)

发行代码：

let CompetitionDayDifference = userCalendar.components (dayCalendarUnit, fromDate: currentDate!, toDate: competitionDay, options: nil)

无法将NSDateComponents类型的值转换为预期参数 NSCalendarUnit型

附加代码：

let userCalendar = NSCalendar.currentCalendar()


let competitionDate = NSDateComponents()
competitionDate.year = 2015
competitionDate.month = 6
competitionDate.day = 21
competitionDate.hour = 08
competitionDate.minute = 00
let competitionDay = userCalendar.dateFromComponents(competitionDate)!


// Here we compare the two dates
competitionDay.timeIntervalSinceDate(currentDate!)


let dayCalendarUnit = calendar.components([NSCalendarUnit.Day, NSCalendarUnit.Hour, NSCalendarUnit.Minute], fromDate: date)

//here we change the seconds to hours,minutes and days
let CompetitionDayDifference = userCalendar.components (dayCalendarUnit, fromDate: currentDate!, toDate: competitionDay, options: [])

---

根据错误，您的

dayCalendarUnit

是一个NSDateComponents类型的变量。您应该传递一个

NSCalendarUnit

。从Swift 2.0开始，您也无法传递选项参数的

nil

，因此您需要传递一个空选项集：

let CompetitionDayDifference = userCalendar.components(NSCalendarUnit.Day, fromDate: currentDate!, toDate: competitionDay, options: [])

---

如果希望有人帮助您，您可能需要包含整行代码以及所用变量的声明/定义语句。可能是的副本。@MartinR顺便说一句，他似乎在为第一个参数传递错误的类型（除了选项问题之外），如果您想向最终用户显示这段经过的时间，您可以跳过一些内容，直接转到

NSDateComponentsFormatter

，例如

let formatter=NSDateComponentsFormatter（）；formatter.unitsStyle=.Full；formatter.allowedUnits=[.Day、.Hour、.Minute]；让string=formatter.stringFromDate（firstDate，toDate:secondDate）