swift 3.0 数据到字符串？

Question

func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {}

我想要deviceToken串

但是:

let str = String.init(data: deviceToken, encoding: .utf8)

str 是 nil

swift 3.0

如何让 data 变成 string ？

Registering for Push Notifications in Xcode 8/Swift 3.0?不工作，答案是几个月前，我已经试过了:

并打印:

Answer 1

我是来寻找 Swift 3 Data to String 问题的答案的，但从来没有得到好的答案。经过一番鬼混之后，我想到了这个:

var testString = "This is a test string"
var somedata = testString.data(using: String.Encoding.utf8)
var backToString = String(data: somedata!, encoding: String.Encoding.utf8) as String!