如何设置 DateComponentFormatter 的本地而不是当前？

Question

情况

我有一个函数，它使用DateComponentFormatter's 函数fun string(from: Date, to: Date)根据两个日期之间的时差返回一个格式化的字符串，它工作得很好。但是我想始终以英语返回这个格式化的字符串（当前根据设备的本地格式进行格式化）。

问题

你如何DateComponentFormatter像你可以用DateFormatter's做的那样设置's 本地？如果你不能，你将如何进行？

代码：

import Foundation

func returnRemainingTimeAsString(currentDate: Date, nextDate: Date)->String {

  let dateComponentsFormatter = DateComponentsFormatter()
  dateComponentsFormatter.unitsStyle = DateComponentsFormatter.UnitsStyle.full
  dateComponentsFormatter.allowedUnits = [.day, .hour, .minute, .second]
  dateComponentsFormatter.maximumUnitCount = 1

  let differenceAsString = dateComponentsFormatter.string(from: currentDate, to: nextDate)!

  return differenceAsString
}

let currentDate = Date()
let futureDate = currentDate.addingTimeInterval(3604)
returnRemainingTimeAsString(currentDate: currentDate, nextDate: futureDate)

// prints 1 hour (if devices local is English) or 1 hora (if Spanish),
// and I want it to return always 1 hour.

Answer 1

DateComponentsFormatter有一个calendar属性。

获取当前日历，设置其语言环境并将日历分配给格式化程序。

let dateComponentsFormatter = DateComponentsFormatter()
var calendar = Calendar.current
calendar.locale = Locale(identifier: "en_US_POSIX")
dateComponentsFormatter.calendar = calendar
dateComponentsFormatter.unitsStyle = .full
...