objective-c - 如何将 NSUUID 转换为 NSData

Question

我需要NSData从不vendorIdentifier转换为NSString清除字节的情况下获取。如何NSUUID使用getUUIDBytes:to转换NSData？

Answer 1

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

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

Answer 2

使用它来获取vendorIdentifieras Data(Swift 4)：

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

请记住，如文档UIDevice.current.identifierForVendor所述，请注意不要为零。

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原始答案（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 3

斯威夫特 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)