存储的时间戳和当前日期之间的差异

Difference between timestamp stored and current date

我已经将我制作的应用程序链接到 Firebase 数据库。

应用程序在按下按钮时将时间作为 timeIntervalSinceReferenceDate 发送给 Firebase。该值的示例是 - 498898978852.928.

我希望这个数字能够区分用户是否在 48 小时前按下了同一个按钮。

有没有办法测量 48 小时的时间段,或者我应该使用其他方法?

我正在使用 swift 2 和 Xcode 7!

您正在使用 unix timeStamp*1000,当转换为 Int 时,它被用作时间戳,但由于您将使用它进行时间操作。用它来存储你的时间戳:-

let timeStamp = NSDate.timeIntervalSinceReferenceDate // Like this only

在您的 class 范围之外扩展 NSDate

extension NSDate {

 func daysFromTheDate(date: NSDate) -> Int {
    return NSCalendar.currentCalendar().components(.Day, fromDate: date, toDate: self, options: []).day
}
}

class  yourViewController : UIViewController,.. {
 ...
  }

声明:-

 let date1 = NSDate() // Declare the variable globally

然后在你的 .observe 事件 firebase 函数中使用这个:-

 var retrieved_timeStamp = ... // timeStamp that you retrieve from firebase
 var date = NSDate(timeIntervalSinceReferenceDate: timeInterval(retrieved_timeStamp)) 
 print(date1.daysFromTheDate(from: date as NSDate))

检查条件

if date1.daysFromTheDate(from: date as NSDate) >= 2{

         //48 or more hours have passed now, Do the Job. Bingo!..       

    }

有关进一步的日期操作,请查找:- Difference between two NSDates

Swift 3.如果你正在使用Swift 2,使用NSDate

//the first button press, this is a double but assume it's a timeInterval
let firstPress = 498898978.928 

let date = Date()

let secondPress = date.timeIntervalSinceReferenceDate //the second button press

let diffInSeconds = secondPress - firstPress //total time difference in seconds

let hours = diffInSeconds/60/60 //hours=diff in seconds / 60 sec per min / 60 min per hour

if hours < 48 {
     print("less then 48 hours difference")
} else {
     print("greater/equal to 48 hours difference")
}