swift nsdate interval
Finding the difference in time between two NSDates Swift – Stack Overflow
可以用：
let interval:NSTimeInterval = curTimestamp.timeIntervalSinceDate(prevTimestamp!) |
最后完整的代码如下：
//: Playground – noun: a place where people can play import UIKit extension NSDate { //2015 func Year() -> Int { let curCalendar:NSCalendar = NSCalendar.currentCalendar() let componentYear:Int = curCalendar.component(NSCalendarUnit.Year, fromDate: self) return componentYear } //11 func Month() -> Int { let curCalendar:NSCalendar = NSCalendar.currentCalendar() let componentMonth:Int = curCalendar.component(NSCalendarUnit.Month, fromDate: self) return componentMonth } //28 func Day() -> Int { let curCalendar:NSCalendar = NSCalendar.currentCalendar() let componentDay:Int = curCalendar.component(NSCalendarUnit.Day, fromDate: self) return componentDay } //10 func Hour() -> Int { let curCalendar:NSCalendar = NSCalendar.currentCalendar() let componentHour:Int = curCalendar.component(NSCalendarUnit.Hour, fromDate: self) return componentHour } //39 func Minute() -> Int { let curCalendar:NSCalendar = NSCalendar.currentCalendar() let componentMinute:Int = curCalendar.component(NSCalendarUnit.Minute, fromDate: self) return componentMinute } //18 func Second() -> Int { let curCalendar:NSCalendar = NSCalendar.currentCalendar() let componentSecond:Int = curCalendar.component(NSCalendarUnit.Second, fromDate: self) return componentSecond } //get short style date time string //11/28/15, 10:51 AM func toStringShort() -> String { let dateFormatter:NSDateFormatter = NSDateFormatter() dateFormatter.dateStyle = NSDateFormatterStyle.ShortStyle dateFormatter.timeStyle = NSDateFormatterStyle.ShortStyle let shortStyleStr:String = dateFormatter.stringFromDate(self) return shortStyleStr } //get medium style date time string //Nov 28, 2015, 10:51:33 AM func toStringMedium() -> String { let dateFormatter:NSDateFormatter = NSDateFormatter() dateFormatter.dateStyle = NSDateFormatterStyle.MediumStyle dateFormatter.timeStyle = NSDateFormatterStyle.MediumStyle let mediumStyleStr:String = dateFormatter.stringFromDate(self) return mediumStyleStr } //get long style date time string //November 28, 2015 at 10:51:33 AM GMT+8 func toStringLong() -> String { let dateFormatter:NSDateFormatter = NSDateFormatter() dateFormatter.dateStyle = NSDateFormatterStyle.LongStyle dateFormatter.timeStyle = NSDateFormatterStyle.LongStyle let longStyleStr:String = dateFormatter.stringFromDate(self) return longStyleStr } //get full style date time string //Saturday, November 28, 2015 at 10:51:33 AM China Standard Time func toStringFull() -> String { let dateFormatter:NSDateFormatter = NSDateFormatter() dateFormatter.dateStyle = NSDateFormatterStyle.FullStyle dateFormatter.timeStyle = NSDateFormatterStyle.FullStyle let fullStyleStr:String = dateFormatter.stringFromDate(self) return fullStyleStr } //get date formatted string //2015/11/28 10:48:12 func toString(dateFormat:String) -> String { let dateFormatter:NSDateFormatter = NSDateFormatter() dateFormatter.dateFormat = dateFormat let formattedDatetimeStr:String = dateFormatter.stringFromDate(self) return formattedDatetimeStr } //parse input date time string into NSDate //input: 2015/11/28 12:01:02 and yyyy/MM/dd HH:mm:ss //output: Optional(2015-11-28 04:01:02 +0000) static func fromString(datetimeStr:String, dateFormat:String) -> NSDate? { let dateFormatter:NSDateFormatter = NSDateFormatter() dateFormatter.dateFormat = dateFormat let parsedDatetime:NSDate? = dateFormatter.dateFromString(datetimeStr) return parsedDatetime } //from milli second timestamp to NSDate static func fromTimestampMsec(timestampInt64InMsec:Int64) -> NSDate { // print("timestampInt64InMsec=\(timestampInt64InMsec)") //timestampInt64InMsec=1449805150184 let timestampDoubleInSec:Double = Double(timestampInt64InMsec)/1000 // print("timestampDoubleInSec=\(timestampDoubleInSec)") //timestampDoubleInSec=1449805150.184 let parsedDate:NSDate = NSDate(timeIntervalSince1970: NSTimeInterval(timestampDoubleInSec)) // print("parsedDate=\(parsedDate)") //parsedDate=2015-12-11 03:39:10 +0000 return parsedDate } } func generateTimestampStr(prevTimestamp:NSDate?, curTimestamp:NSDate) -> String { //let timestampStr = timestamp.toString("yy/MM/dd HH:mm:ss") // let timestampStr = timestamp.toString("HH:mm:ss") var curTimestampStr:String = "" if prevTimestamp == nil { curTimestampStr = curTimestamp.toString("yyyy/MM/dd HH:mm") return curTimestampStr } let prevOneDayInterval:NSTimeInterval = NSTimeInterval(-60*60*24) let fiveMinutesInterval:NSTimeInterval = NSTimeInterval(5*60) /* 上下两条时间差在5分钟以内，不显示时间 上下两条差1天以内，显示发送时间，不用日期 上下两条差3天以内，显示昨天/前天+发送时间 上下两条差3天以上，显示日期+发送时间 */ let today:NSDate = NSDate() print("today=\(today)") let yestoday:NSDate = today.dateByAddingTimeInterval(prevOneDayInterval) print("yestoday=\(yestoday)") let dayBeforeYestoday:NSDate = yestoday.dateByAddingTimeInterval(prevOneDayInterval) print("dayBeforeYestoday=\(dayBeforeYestoday)") let interval:NSTimeInterval = curTimestamp.timeIntervalSinceDate(prevTimestamp!) if interval < fiveMinutesInterval { //within 5 minutes, not show timestamp curTimestampStr = "" } else { if curTimestamp.Year() == today.Year() { //same year if (curTimestamp.Month() == today.Month()) && (curTimestamp.Day() == today.Day()) { //today curTimestampStr = curTimestamp.toString("HH:mm") } else if (curTimestamp.Month() == yestoday.Month()) && (curTimestamp.Day() == yestoday.Day()) { curTimestampStr = curTimestamp.toString("昨天 HH:mm") } else if (curTimestamp.Month() == dayBeforeYestoday.Month()) && (curTimestamp.Day() == dayBeforeYestoday.Day()) { curTimestampStr = curTimestamp.toString("前天 HH:mm") } else { curTimestampStr = curTimestamp.toString("MM/dd HH:mm") } } else { //not same year curTimestampStr = curTimestamp.toString("yyyy/MM/dd HH:mm") } } print("prevTimestamp=\(prevTimestamp), curTimestamp=\(curTimestamp) -> curTimestampStr=\(curTimestampStr)") return curTimestampStr } //let prevTimestamp = NSDate.fromString("2015/11/28 12:01:02", dateFormat: "yyyy/MM/dd HH:mm:ss")! //let curTimestamp = NSDate.fromString("2016/01/01 12:01:02", dateFormat: "yyyy/MM/dd HH:mm:ss")! let prevTimestamp = NSDate.fromString("2015/01/28 12:01:02", dateFormat: "yyyy/MM/dd HH:mm:ss")! let curTimestamp = NSDate.fromString("2015/02/15 11:37:02", dateFormat: "yyyy/MM/dd HH:mm:ss")! generateTimestampStr(nil, curTimestamp:curTimestamp) //generateTimestampStr(prevTimestamp, curTimestamp:curTimestamp) //var today:NSDate = NSDate() ////let yestoday:NSDate = today.dateByAddingTimeInterval(-3600*24*365) //let yestoday:NSDate = today.dateByAddingTimeInterval(-3600*24) //let dayBeforeYestoday = yestoday.dateByAddingTimeInterval(-3600*24) |
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