日期/时间Swift中的自然语言近似 [英] Date/Time Natural Language Approximation in Swift

问题描述

我尝试使用Swift将UTC格式的日期从API转换为人类可读的近似格式。

我正在寻找类似以下的东西：

2015-07-14T13：51：05.423Z

到

大约两周前

在Swift中最好的方法是什么？虽然最好这可以直接格式化字符串，我明白这可能需要将字符串转换为NSDate对象。

任何帮助将非常感激。 b
$ b

编辑：我的问题已被标识为可能与另一个问题重复。下面的汤姆的解决方案是为Swift编写的，比创建一个新的方法更优雅。

解决方案

脚步。首先，将日期字符串转换为 NSDate ：

  let dateString = 2015-07-14T13：51：05.423Z
 
 let df = NSDateFormatter（）
 df.dateFormat =yyyy-MM-dd'T'HH：mm：ss.SSSZ 
 let date = df.dateFromString（dateString）
  

接下来，使用 NSDateComponentsFormatter

code>以获取所需的字符串：

  let formatter = NSDateComponentsFormatter（）
 formatter.unitsStyle = NSDateComponentsFormatterUnitsStyle .Full 
 formatter.includesApproximationPhrase = true 
 formatter.includesTimeRemainingPhrase = false 
 formatter.allowedUnits = NSCalendarUnit.WeekOfMonthCalendarUnit 
 
如果let pastDate = date {
 let dateRelativeString = formatter.stringFromDate（pastDate，toDate：NSDate（））
} 
  

7月28日，因此该字符串的结果是约2周。 allowedUnits 属性是一个位字段，因此您可以指定允许的单位类型数量。

I am attempting to convert a UTC formatted date from an API to a human-readable approximation format using Swift.

I'm looking for something like the following:

2015-07-14T13:51:05.423Z

to

About two weeks ago

What is the best approach to this in Swift? While optimally this could format strings directly, I understand that this will probably require casting the string to a NSDate object.

Any help would be greatly appreciated.

EDIT: My question had been identified as a possible duplicate of another question. Tom's solution below is written for Swift and much more elegant than creating a new method in regards to my situation.

解决方案

You need two steps. First, convert your date string to an NSDate:

let dateString = "2015-07-14T13:51:05.423Z"

let df = NSDateFormatter()
df.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ"
let date = df.dateFromString(dateString)

(If that's not an exact representation of the strings you get, you'll have to change the date format string to get this to convert).

Next, use NSDateComponentsFormatter to get your desired string:

let formatter = NSDateComponentsFormatter()
formatter.unitsStyle = NSDateComponentsFormatterUnitsStyle.Full
formatter.includesApproximationPhrase = true
formatter.includesTimeRemainingPhrase = false
formatter.allowedUnits = NSCalendarUnit.WeekOfMonthCalendarUnit

if let pastDate = date {
    let dateRelativeString = formatter.stringFromDate(pastDate, toDate: NSDate())
}

Today is July 28, so the result for that string is "About 2 weeks". The allowedUnits attribute is a bit field, so you can specify as many unit types as you want to allow.

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