如何将NSUUID转换为NSData

Question

我需要从NSData中获得vendorIdentifier，而不需要转换为NSString，清除字节。如何使用NSUUID将getUUIDBytes:转换为NSData

Answer 1

使用它作为vendorIdentifier作为Data (Swift 4)：

var uuidBytes = UIDevice.current.identifierForVendor!.uuid
let uuidData = NSData(bytes: &uuidBytes, length: 16) as Data

记住，要防止UIDevice.current.identifierForVendor像文档所说的那样为零。

原文(Swift 2版本)：

var uuidBytes: [UInt8] = [UInt8](count: 16, repeatedValue: 0)
UIDevice.currentDevice().identifierForVendor!.getUUIDBytes(&uuidBytes)
let uuidData = NSData(bytes: &uuidBytes, length: 16)

Answer 2

Swift 3版本：

let vendorId = UIDevice.current.identifierForVendor!
let uuidBytes = Mirror(reflecting: vendorId.uuid).children.map { $0.1 as! UInt8 }
let data = Data(bytes: uuidBytes)