Swift 转换时间之前 [英] Swift convert time to time ago

问题描述

在 Swift5 中，我们有 RelativeDateTimeFormatter

In Swift5, we have RelativeDateTimeFormatter

Swift5 之前:

我正在尝试转换时间，我想做的是:

I'm trying to convert time to time ago, what i wanna do is:

从 1 到 15 秒它会说刚才"

from 1 to 15 seconds it will say " Just now "

从 60 分钟到 119 分钟，它会说一小时前"

from 60 minutes to 119 minutes it will say " an hour ago "

从 24 小时到 47 小时它会说昨天"

from 24 hours to 47 hours it will say " Yesterday "

从 7 天到 7 天 23 小时它会说一周前"

from 7 days to 7 days and 23 hours it will say " a week ago "

我不确定我的计数是否有错，请随时为我修复

I'm not sure about my counting if am i wrong feel free to fix it for me

这是代码

    extension NSDate {

    struct Date {
        static let timeFormatter: NSDateFormatter = {
            let df = NSDateFormatter()
            df.calendar = NSCalendar(calendarIdentifier: NSCalendarIdentifierGregorian)
            df.dateFormat = "h:mm a"
            return df
            }()
    }
    var time: String { return Date.timeFormatter.stringFromDate(self) }

    var year:    Int { return NSCalendar.autoupdatingCurrentCalendar().component(.Year,   fromDate: self) }
    var month:   Int { return NSCalendar.autoupdatingCurrentCalendar().component(.Month,  fromDate: self) }
    var day:     Int { return NSCalendar.autoupdatingCurrentCalendar().component(.Day,    fromDate: self) }
    var hour:     Int { return NSCalendar.autoupdatingCurrentCalendar().component(.Hour,    fromDate: self) }
    var minute:     Int { return NSCalendar.autoupdatingCurrentCalendar().component(.Minute,    fromDate: self) }
    var second:     Int { return NSCalendar.autoupdatingCurrentCalendar().component(.Second,    fromDate: self) }


    struct DateComponents {
        static let formatter: NSDateComponentsFormatter = {
            let dcFormatter = NSDateComponentsFormatter()
            dcFormatter.calendar = NSCalendar(identifier: NSCalendarIdentifierISO8601)!
            dcFormatter.unitsStyle = .Full
            dcFormatter.maximumUnitCount = 1
            dcFormatter.zeroFormattingBehavior = .Default
            dcFormatter.allowsFractionalUnits = false
            dcFormatter.allowedUnits = [.Year, .Month, .Weekday, .Day, .Hour, .Minute, .Second]
            return dcFormatter
            }()
    }

    var elapsedTime: String {


        if isecond(NSDate()) {
            return "Just now"

        }

        if ishour(NSDate()) {
           return "an hour ago"

        }
        if isyesterday(NSDate()) {
            return "Yesterday"
        }
        if isweek(NSDate()) {

            return "a week ago"
        }




        return (DateComponents.formatter.stringFromTimeInterval(NSDate().timeIntervalSinceDate(self)) ?? "") + " ago"
    }
    func isyesterday(date: NSDate) -> Bool {
        return  NSCalendar.autoupdatingCurrentCalendar().isDate(self, inSameDayAsDate: date.yesterday)
    }
    var yesterday: NSDate {
        return  NSCalendar.autoupdatingCurrentCalendar().dateWithEra(1, year: year, month: month, day: day-1, hour: 0, minute: 0, second: 0, nanosecond: 0)!
    }



    func isweek(date: NSDate) -> Bool {
        return  NSCalendar.autoupdatingCurrentCalendar().isDate(self, inSameDayAsDate: date.weekago)
    }
    var weekago: NSDate {
        return  NSCalendar.autoupdatingCurrentCalendar().dateWithEra(1, year: year, month: month, day: day-7, hour: 0, minute: 0, second: 0, nanosecond: 0)!
    }

    func isecond(date: NSDate) -> Bool {
        return  NSCalendar.autoupdatingCurrentCalendar().isDate(self, inSameDayAsDate: date.secondsago)
    }
    var secondsago: NSDate {
        return  NSCalendar.autoupdatingCurrentCalendar().dateWithEra(1, year: year, month: month, day: 0, hour: 0, minute: 0, second: second-15, nanosecond: 0)!
    }

    func ishour(date: NSDate) -> Bool {
        return  NSCalendar.autoupdatingCurrentCalendar().isDate(self, inSameDayAsDate: date.hourago)
    }
    var hourago: NSDate {
        return  NSCalendar.autoupdatingCurrentCalendar().dateWithEra(1, year: year, month: month, day: 0, hour: hour-1, minute: minute-1, second: 0, nanosecond: 0)!
    }
}

这是我在我的应用程序中得到的:

here what i got in my app :

一小时前"、刚才"等的引号没有显示，只有昨天"，我不确定是不是只有 7 天到 23 小时！

the quotes which is "an hour ago" , " Just now", etc not showing, only " Yesterday" and i'm not sure if it is from 7 days to 23 hours only!

这是我的第一个问题链接:Swift 如何转换 Parse createdAt time ago?

and here is my first question link : Swift How to convert Parse createdAt time to time ago?

请帮我修复代码，感谢@Leo Dabus 提供代码.

Please help me to fix the code, thanks to @Leo Dabus for the code.

推荐答案

我将更新 Truongky 对 SWIF 3 的回答:

I'll just update the Truongky's answer for Swif 3:

extension Date {

func getElapsedInterval() -> String {

    let interval = Calendar.current.dateComponents([.year, .month, .day], from: self, to: Date())

    if let year = interval.year, year > 0 {
        return year == 1 ? "(year)" + " " + "year ago" :
            "(year)" + " " + "years ago"
    } else if let month = interval.month, month > 0 {
        return month == 1 ? "(month)" + " " + "month ago" :
            "(month)" + " " + "months ago"
    } else if let day = interval.day, day > 0 {
        return day == 1 ? "(day)" + " " + "day ago" :
            "(day)" + " " + "days ago"
    } else {
        return "a moment ago"

    }

}
}

如果您更喜欢可本地化的响应而不是仅使用英文，则此代码可以完成工作

extension Date {
func getElapsedInterval() -> String {

    var calendar = Calendar.current
    calendar.locale = Locale(identifier: Bundle.main.preferredLocalizations[0]) 
// IF THE USER HAVE THE PHONE IN SPANISH BUT YOUR APP ONLY SUPPORTS I.E. ENGLISH AND GERMAN
// WE SHOULD CHANGE THE LOCALE OF THE FORMATTER TO THE PREFERRED ONE 
// (IS THE LOCALE THAT THE USER IS SEEING THE APP), IF NOT, THIS ELAPSED TIME 
// IS GOING TO APPEAR IN SPANISH

    let formatter = DateComponentsFormatter()
    formatter.unitsStyle = .full
    formatter.maximumUnitCount = 1
    formatter.calendar = calendar

    var dateString: String?

    let interval = calendar.dateComponents([.year, .month, .weekOfYear, .day], from: self, to: Date())

    if let year = interval.year, year > 0 {
        formatter.allowedUnits = [.year] //2 years
    } else if let month = interval.month, month > 0 {
        formatter.allowedUnits = [.month] //1 month
    } else if let week = interval.weekOfYear, week > 0 {
        formatter.allowedUnits = [.weekOfMonth] //3 weeks
    } else if let day = interval.day, day > 0 {
        formatter.allowedUnits = [.day] // 6 days
    } else {
        let dateFormatter = DateFormatter()
        dateFormatter.locale = Locale(identifier: Bundle.main.preferredLocalizations[0]) //--> IF THE USER HAVE THE PHONE IN SPANISH BUT YOUR APP ONLY SUPPORTS I.E. ENGLISH AND GERMAN WE SHOULD CHANGE THE LOCALE OF THE FORMATTER TO THE PREFERRED ONE (IS THE LOCALE THAT THE USER IS SEEING THE APP), IF NOT, THIS ELAPSED TIME IS GOING TO APPEAR IN SPANISH
        dateFormatter.dateStyle = .medium
        dateFormatter.doesRelativeDateFormatting = true

        dateString = dateFormatter.string(from: self) // IS GOING TO SHOW 'TODAY'
    }

    if dateString == nil {
        dateString = formatter.string(from: self, to: Date())
    }

    return dateString!
}

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