Swift - iOS UTC 日期和时间设置为带有偏移的设备日期和时间格式

Question

我是 iOS 新手。

我以 UTC YYYY-mm-dd H:i:s 格式获取时间。我想根据设备区域格式化和偏移日期和时间。

代码

let utcdatestring  = cat.created
let localdate = Validator.UTCToLocal(date: utcdatestring, fromFormat: "yyyy-MM-dd HH:mm:ss", toFormat: Constants.dateformat)
let localtime = Validator.UTCToLocal(date: utcdatestring, fromFormat: "yyyy-MM-dd HH:mm:ss", toFormat: Validator.gettimeformat())

let locale = Locale.current.identifier
let formater = DateFormatter()
formater.dateFormat = "dd-MMM-yyyy"
formater.locale =  Locale(identifier: locale)
let showdate = formater.date(from: localdate)

let tformater = DateFormatter()
tformater.dateFormat = "hh:mm"
tformater.locale =  Locale(identifier: locale)
let showtime = tformater.date(from: localtime)

我在苹果documentation 上找到了一些方法，但不确定如何在我的代码中实现。

参考

let dateFormatter = DateFormatter()
dateFormatter.dateStyle = .medium
dateFormatter.timeStyle = .none
 
let date = Date(timeIntervalSinceReferenceDate: 118800)
 
// US English Locale (en_US)
dateFormatter.locale = Locale(identifier: "en_US")
print(dateFormatter.string(from: date)) // Jan 2, 2001
 
// French Locale (fr_FR)
dateFormatter.locale = Locale(identifier: "fr_FR")
print(dateFormatter.string(from: date)) // 2 janv. 2001
 
// Japanese Locale (ja_JP)
dateFormatter.locale = Locale(identifier: "ja_JP")
print(dateFormatter.string(from: date)) // 2001/01/02

问题：

如何将 UTC 日期和时间转换为带偏移量的设备日期和时间格式

Answer 1

let utcdatestring  = cat.created
let localdate = Validator.UTCToLocal(date: utcdatestring, fromFormat: "yyyy-MM-dd HH:mm:ss", toFormat: Constants.dateformat)
let localtime = Validator.UTCToLocal(date: utcdatestring, fromFormat: "yyyy-MM-dd HH:mm:ss", toFormat: Validator.gettimeformat())

let formater = DateFormatter()
formater.dateFormat = "dd-MMM-yyyy"
let showdate = formater.date(from: localdate)

let tformater = DateFormatter()
tformater.dateFormat = "hh:mm"
let showtime = tformater.date(from: localtime)

试试这样。我猜语言环境会自动设置