比较NSDate [英] Comparing NSDate

问题描述

我想比较两个NSDates，但每个日期显示为早于 todays日期。任何想法？

 让compareResult = self.todaysDate.compare（self.date）
 
 if compareResult == NSComparisonResult.OrderedDescending {
 println（Today is late than date2）
} else {
 println（Future）
} 
  
 
 
 
要获得todaysDate
 
 
 
  let todaysDate = NSDate（）
 let calendar = NSCalendar.currentCalendar（）
 let components = calendar.components（.CalendarUnitHour | .CalendarUnitMinute | .CalendarUnitMonth | .CalendarUnitYear | .CalendarUnitDay ，fromDate：todaysDate）
 let hour = components.hour 
 let minutes = components.minute 
 let month = components.month 
 let year = components.year 
 let day = components.day 
 println（todaysDate）
  
此打印件是：
  2014-11-12 14:48:48 +0000 
  
并且date的打印是：
  2014-10-24 07:24:41 +0000 
  
这是在Parse.com服务器。
 
 
 
感谢
解决方案
如果您要支持 == ，< ，> ， <= 或> = 为 NSDate 在这个地方声明：
  public func ==（lhs：NSDate，rhs：NSDate） Bool {
 return lhs === rhs || lhs.compare（rhs）== .OrderedSame 
} 
 
 public func<（lhs：NSDate，rhs：NSDate） - > Bool {
 return lhs.compare（rhs）== .OrderedAscending 
} 
 
 extension NSDate：Comparable {} 
  
实施 == 和<  c $ c> Comparable 推断其他比较运算符。
 
 
 
用法：
  let date1 = NSDate（）
 let date2 = NSDate（）
 
 println（date2> date1）// true 
 println < date1）// true 
 println（date2 == date2）// true 
  
 
I would like to compare two NSDates however every date shows as being "Earlier" than todaysDate. Any ideas?
let compareResult = self.todaysDate.compare(self.date)

if compareResult == NSComparisonResult.OrderedDescending {
println("Today is later than date2")
} else {
println("Future")
}
To get "todaysDate"
let todaysDate = NSDate()
let calendar = NSCalendar.currentCalendar()
    let components = calendar.components(.CalendarUnitHour | .CalendarUnitMinute | .CalendarUnitMonth | .CalendarUnitYear | .CalendarUnitDay, fromDate: todaysDate)
let hour = components.hour
let minutes = components.minute
let month = components.month
let year = components.year
let day = components.day
println(todaysDate)
This print is:
2014-11-12 14:48:48 +0000
and the print for "date" is:
2014-10-24 07:24:41 +0000
This is on a Parse.com server.

Thanks
解决方案
If you want to support ==, <, >, <=, or >= for NSDates, you just have to declare this somewhere:
public func ==(lhs: NSDate, rhs: NSDate) -> Bool {
    return lhs === rhs || lhs.compare(rhs) == .OrderedSame
}

public func <(lhs: NSDate, rhs: NSDate) -> Bool {
    return lhs.compare(rhs) == .OrderedAscending
}

extension NSDate: Comparable { }
Implementing == and < lets Comparable infer the other comparison operators.

Usage:
let date1 = NSDate()
let date2 = NSDate()

println(date2 > date1) // true
println(date2 < date1) // false
println(date2 == date2) // true


                        
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