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Hexadecimal string from NSDate
import Foundation
extension NSData {
var hexadecimalString: String {
var result = ""
enumerateByteRangesUsingBlock { (pointer, range, _) in
let pointerToBytes = UnsafePointer<UInt8>(pointer)
let bytes = UnsafeBufferPointer(start: pointerToBytes, count: range.length)
for v in bytes {
result.appendContentsOf(String(format:"%02x", v))
return result
let d = NSData(bytes: [0xDE, 0xAD, 0xBE, 0xEF] as [UInt8], length: 4)
let c = d.hexadecimalString // deadbeef
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