【Swift】日期比较函数 记录下 Comparing date in Swift

Add this code to your project and comparing dates is easier than ever

扩展NSDATE

//swift 3.0.2

extension NSDate
{
    func isGreaterThanDate(dateToCompare : NSDate) -> Bool
    {
        var isGreater = false
        if self.compare(dateToCompare as Date) == ComparisonResult.orderedDescending
        { isGreater = true }
        return isGreater
    }
    
    func isLessThanDate(dateToCompare : NSDate) -> Bool
    {
        var isLess = false
        if self.compare(dateToCompare as Date) == ComparisonResult.orderedAscending
        { isLess = true }
        return isLess
    }
    
    func addDays(daysToAdd : Int) -> NSDate
    {
        let secondsInDays : TimeInterval = Double(daysToAdd) * 60 * 60 * 24
        let dateWithDaysAdded : NSDate = self.addingTimeInterval(secondsInDays)
        return dateWithDaysAdded
    }
    
    func addHours(hoursToAdd : Int) -> NSDate
    {
        let secondsInHours : TimeInterval = Double(hoursToAdd) * 60 * 60
        let dateWithHoursAdded : NSDate = self.addingTimeInterval(secondsInHours)
        return dateWithHoursAdded
    }
}

t’s easy to use. Here’s a couple of examples

在.SWIFT调用就行了，EASY的很！

var today = NSDate()
var oneHourFromNow = today.addHours(1)
if today.isGreaterThanDate(oneHourFromNow) {
  println("Something is terrebly wrong.")
}
var aWeekFromNow = today.addDays(7)

原文链接：http://myxcode.net/2015/08/30/comparing-dates-in-swift/