Swift 3 Check Two times against each other help

Question

Created Jan ’17

Replies 6

Boosts 0

Views 6.4k

Participants 4

Hi,

I'm trying to compare two times against each other for a checkTimer method. I've got the functionality right, it's the 24 hour issue that's causing a problem.

The functionality should be that if the current time is greater than the userDefault time then return true. The Bug exists where it's the next day. Am I better comparing two dates against each other or is there a simpler way.

My method

func checkTimer() -> Bool {
      
        let time = Int(currentTime())!
      
        print(time)
      
        let storedTime = Int(UserDefaults.standard.integer(forKey: "LastAccessTime"))
      
        if time >= storedTime {
            print("Enough time has passed \(storedTime)")
            return true
        }
      
        print("Not enough time has passed \(storedTime)")
        return false
      
    }
  
    func currentTime() -> String {
        let currentTime = Date()
        let formatter = DateFormatter()
        formatter.dateFormat = "Hmm"
        let time = formatter.string(from: currentTime)
        return "\(time)"
    }

Thanks!

Boost

Answer 1

QuinceyMorris OP

Jan ’17

You have to be more explicit about what you want — "time" is too ambiguous.

A Date value is actually a date/time. If you want to compare the current date/time with the date/time at which something was last accessed, you should use the Date values, and not try to convert to strings or Ints. (Note: You can store a Date value in user defaults.) Such Date values are independent of time zone, daylight savings time, etc.

If you mean a time of day, for example if you want to make a new backup of a file every day at a certain time, you're going to have to work a bit harder to deal with time zones, etc.

0

Answer 2

DTS Engineer OP

Apple

Jan ’17

If you mean a time of day, for example if you want to make a new backup of a file every day at a certain time, you're going to have to work a bit harder to deal with time zones, etc.

Which we covered over in this thread.

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Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

0

Answer 3

JayCo OP

Jan ’17

Hey,

Essentially I wish to minimise an API call to 1 hour intervals. If an hour has passed then allow the API call.

0

Answer 4

JayCo OP

Jan ’17

Hey,

I thought out the time process again and came to a much simpler way. I'm getting the current time from Date so this should solve any time issues. If the device travels back in time then I will catch it by < 1 hour period.

Thanks

0

Answer 5

QuinceyMorris OP

Jan ’17

So let's try a simpler version of your function:

func checkTimer() -> Bool { 
     let time = Date () 
     print(time) 
     if let storedTime = UserDefaults.standard.object(forKey: "LastAccessTime")) as? Date, time >= storedTime { 
          print("Enough time has passed \(storedTime)") 
          return true 
     } 
     print("Not enough time has passed \(storedTime)") 
     return false 
}

Note that I've used an "if let" construct to check if the last access time exists in user defaults, and a Swift 3 "if XXX, YYY {…}" construct to test for both conditions XXX (last access time exists) and YYY (it's in the past) simultaneously.

Is this the functionality you're looking for?

0

Answer 6

goldsdad OP

Jan ’17

Maybe the Timer class will help - https://developer.apple.com/reference/foundation/timer

0