［已解决］swift中判断两个NSDate的时间大小

有两个NSDate变量，需要判断时间大小：

var timestamp:NSDate

if newMessage.timestamp > curMessage.timestamp {

搜：

swift nsdate compare

NSDate Comparison using Swift – Stack Overflow

代码：

//: Playground – noun: a place where people can play

import UIKit

let timestamp1IntInMsec = 1449805150184
let timestamp2IntInMsec = 1449605150184
let timestamp3IntInMsec = 1449605150184

func parseDateFromTimestamp(timestampIntInMsec:Int) -> NSDate {
    print("timestampIntInMsec=\(timestampIntInMsec)")
    let timestampDoubleInSec:Double = Double(timestampIntInMsec)/1000
    print("timestampDoubleInSec=\(timestampDoubleInSec)")
    let parsedDate:NSDate = NSDate(timeIntervalSince1970: NSTimeInterval(timestampDoubleInSec))
    print("parsedDate=\(parsedDate)")

    return parsedDate
}

let timestamp1 = parseDateFromTimestamp(timestamp1IntInMsec)
let timestamp2 = parseDateFromTimestamp(timestamp2IntInMsec)
let timestamp3 = parseDateFromTimestamp(timestamp3IntInMsec)

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 { }

timestamp1 > timestamp2
timestamp1 < timestamp2

timestamp1 == timestamp2
timestamp3 == timestamp2

timestamp1 <= timestamp2
timestamp1 >= timestamp2

timestamp3 <= timestamp2

timestamp3 >= timestamp2

效果：

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［已解决］swift中判断两个NSDate的时间大小

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