如何将NSUUID转换为NSData

Question

我需要从NSData获得vendorIdentifier而不转换为NSString，清除字节。如何用NSUUID转换getUUIDBytes:到NSData？

Answer 1

NSUUID *vendorIdentifier = [[UIDevice currentDevice] identifierForVendor];
uuid_t uuid;
[vendorIdentifier getUUIDBytes:uuid];

NSData *vendorData = [NSData dataWithBytes:uuid length:16];

Answer 2

用这个来获得vendorIdentifier作为Data（Swift 4）：

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

请记住，正如UIDevice.current.identifierForVendor所说，要防止documentation为零。

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原始答案（Swift 2版）：

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

Answer 3

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)