Swift：如何使用时间格式将String转换为字符串 [英] Swift : how to convert String to string with time format

问题描述

我的字符串值包含格式为HH：mm的时间（16:50）

I have string values include time with formatted "HH:mm" (16:50)

我必须将此值转换为hh：mm 格式（04:50）作为SWIFT中的字符串

i have to convert this value to "hh:mm" format (04:50) as a string in SWIFT

我尝试了NSDateFormatter

i have tried NSDateFormatter like

let time_format = NSDateFormatter() 
time_format.dateFormat = "hh:mm"
var date_from_str = time_format.dateFromString("my string time value")
var str_from_date = time_format.stringFromDate (date_from_str) 

但它不起作用..
请告诉任何解决方案。

but its not working.. Please tell any solution.

推荐答案

您需要2 NSDateFormatter s，一个用于 dateFromString ，一个用于 stringFromDate

You need 2 NSDateFormatters, one for dateFromString, one for stringFromDate

let inFormatter = NSDateFormatter()
inFormatter.locale = NSLocale(localeIdentifier: "en_US_POSIX")
inFormatter.dateFormat = "HH:mm"

let outFormatter = NSDateFormatter()
outFormatter.locale = NSLocale(localeIdentifier: "en_US_POSIX")
outFormatter.dateFormat = "hh:mm"

let inStr = "16:50"
let date = inFormatter.dateFromString(inStr)!
let outStr = outFormatter.stringFromDate(date)
println(outStr) // -> outputs 04:50

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