将 NSTimeInterval 转换为 NSData 并返回 NSTimeInterval

Question

如何将 NSTimeInterval 值转换为 NSData？

Answer 1

NSTimeInterval 只是 Double 的类型别名。您可以像使用任何其他 Foundation 类型一样通过复制字节来存档它。

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

Answer 2

您也可以使用 NSKeyedArchiver:

    let time = NSTimeInterval(100)

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

Answer 3

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{ [=10=].pointee }

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

将 NSTimeInterval 转换为 NSData 并返回 NSTimeInterval

Convert NSTimeInterval to NSData and back to NSTimeInterval

swift

nsdata

nstimeinterval