Swift NSDate比较

Question

我需要安排通知。如果使用dateFromData时间组件的当前日期日期组件的日期早于当天，我想将其更改为第二天。这是我到目前为止所拥有的。无论我如何设置，日期比较都不起作用。它要么总是改变它，要么永远不改变它。

var dateComps = calendar.components(NSCalendarUnit.YearCalendarUnit | NSCalendarUnit.MonthCalendarUnit | NSCalendarUnit.DayCalendarUnit | NSCalendarUnit.HourCalendarUnit | NSCalendarUnit.MinuteCalendarUnit, fromDate: NSDate())

dateComps.hour = calendar.component(NSCalendarUnit.HourCalendarUnit, fromDate: dateFromData)
dateComps.minute = calendar.component(NSCalendarUnit.MinuteCalendarUnit, fromDate: dateFromData)


    if fireDate.compare(NSDate()) == NSComparisonResult.OrderedDescending {
        //change day to next day

        dateComps.day += 1
        println("Change day")
    }else{
        println("Do not change day")
    }




    let notifactionOfAmountOfWork = UILocalNotification()
        notifactionOfAmountOfWork.category = "normalNotifactionCatagory"

    notifactionOfAmountOfWork.fireDate = calendar.dateFromComponents(dateComps)

Answer 1

您的firstDate如何定义？以下程序有效，我刚尝试过。你可以改变comps1.day和comps2.day让它达到两个条件。

import UIKit

let calendar1 = NSCalendar.currentCalendar()
let comps1 = NSDateComponents()
comps1.day = 7
let date1 = calendar1.dateByAddingComponents(comps1, toDate: NSDate(), options: NSCalendarOptions.allZeros)

let calendar2 = NSCalendar.currentCalendar()
let comps2 = NSDateComponents()
comps2.day = 0
let date2 = calendar2.dateByAddingComponents(comps2, toDate: NSDate(), options: NSCalendarOptions.allZeros)


if date1?.compare(date2!) == NSComparisonResult.OrderedDescending
{
    println("date1 is after date 2")
}else{
    println("date1 is before date 2")
}