swift – 比较NSDate

概述我想比较两个NSDates,但每个日期显示为“早于”今天的日期.有任何想法吗？ let compareResult = self.todaysDate.compare(self.date)if compareResult == NSComparisonResult.OrderedDescending {println("Today is later than date2")} else { 我想比较两个NSDates,但每个日期显示为“早于”今天的日期.有任何想法吗？

let compareResult = self.todaysDate.compare(self.date)if compareResult == NSComparisonResult.OrderedDescending {println("Today is later than date2")} else {println("Future")}

获得“今日日期”

let todaysDate = NSDate()let calendar = NSCalendar.currentCalendar()    let components = calendar.components(.CalendarUnitHour | .CalendarUnitMinute | .CalendarUnitMonth | .CalendarUnitYear | .CalendarUnitDay,fromDate: todaysDate)let hour = components.hourlet minutes = components.minutelet month = components.monthlet year = components.yearlet day = components.dayprintln(todaysDate)

这个印刷品是：

2014-11-12 14:48:48 +0000

而“日期”的印刷品是：

2014-10-24 07:24:41 +0000

这是在Parse.com服务器上.

谢谢

解决方法 我想也许你正在解释比较倒退的结果.看一下这个.每个断言通过：

let today = NSDate()let tomorrow = today.dateByAddingTimeInterval(24 * 60 * 60)let yesterday = today.dateByAddingTimeInterval(-24 * 60 * 60)assert(today.compare(tomorrow)  == .OrderedAscending)     // today < tomorrowassert(today.compare(yesterday) == .OrderedDescending)    // today > yesterdayassert(today.compare(today)     == .OrderedSame)          // today == today

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