CODEWITHSUNDEEP
swiftnsdatanstimeinterval
Dror Chen
Dror Chen

Reputation: 51

Convert NSTimeInterval to NSData and back to NSTimeInterval

How do I convert an NSTimeInterval value to NSData?

Upvotes: 0

Views: 1857

Answers (3)

Leo Dabus
Leo Dabus

Reputation: 236508

Xcode 8.3.1 • Swift 3.1

var nowInterval = Date().timeIntervalSince1970                                  // 1491800604.362141
let data = Data(bytes: &nowInterval, count: MemoryLayout<TimeInterval>.size)    // 8 bytes
let timeInterval: Double = data.withUnsafeBytes{ $0.pointee }

let date = Date(timeIntervalSince1970: timeInterval)   // Apr 10, 2017, 2:03 AM"

Upvotes: 4

Tomas Camin
Tomas Camin

Reputation: 10096

You may also use NSKeyedArchiver:

    let time = NSTimeInterval(100)

    let archivedTime = NSKeyedArchiver.archivedDataWithRootObject(time)
    let unarchivedTime = NSKeyedUnarchiver.unarchiveObjectWithData(archivedTime) as! NSTimeInterval

Upvotes: 3

JAL
JAL

Reputation: 42489

NSTimeInterval is just a typealias of Double. You can archive it by copying the bytes like you would with any other Foundation type.

var time = NSTimeInterval(100) // 100.0

let timeData = NSData(bytes: &time, length: sizeof(NSTimeInterval))

var unarchivedTime = NSTimeInterval() // You need to initialize an empty NSTimeInterval object as a var in order to mutate it

timeData.getBytes(&unarchivedTime, length: sizeof(NSTimeInterval))

print(unarchivedTime) // 100.0

Upvotes: 3

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