swift 显示友好时间

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需求：

swift开发，想显示如「24秒前」、「15分钟前」、「今天 14:15」这样的时间称呼。

直接上代码

func friendlyTime(dateTime: String) -> String {        let dateFormatter = NSDateFormatter()    dateFormatter.locale = NSLocale(localeIdentifier: "zh_CN")    dateFormatter.setLocalizedDateFormatFromTemplate("yyyy-MM-dd HH:mm:ss")    if let date = dateFormatter.dateFromString(dateTime) {        let delta = NSDate().timeIntervalSinceDate(date)                if (delta <= 0) {            return "刚刚"        }        else if (delta < 60) {            return "\(Int(delta))秒前"        }        else if (delta < 3600) {            return "\(Int(delta / 60))分钟前"        }        else {            let calendar = NSCalendar.currentCalendar()            let unitFlags = NSCalendarUnit.CalendarUnitYear | NSCalendarUnit.CalendarUnitMonth | NSCalendarUnit.CalendarUnitDay | NSCalendarUnit.CalendarUnitHour | NSCalendarUnit.CalendarUnitMinute            let comp = calendar.components(unitFlags, fromDate: NSDate())            let currentYear = String(comp.year)            let currentDay = String(comp.day)                        let comp2 = calendar.components(unitFlags, fromDate: date)            let year = String(comp2.year)            let month = String(comp2.month)            let day = String(comp2.day)            var hour = String(comp2.hour)            var minute = String(comp2.minute)            if comp2.hour < 10 {                hour = "0" + hour            }            if comp2.minute < 10 {                minute = "0" + minute            }                        if currentYear == year {                if currentDay == day {                    return "今天 \(hour):\(minute)"                } else {                    return "\(month)月\(day)日 \(hour):\(minute)"                }            } else {                return "\(year)年\(month)月\(day)日 \(hour):\(minute)"            }        }    }    return ""}

调用

var dateTime = "2014-12-25 23:07:12"friendlyTime(dateTime)

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