How can I print the content of a variable of type Data using Swift?

Question

All I am looking to do is take a string and get its hex value. I've been following this post. Here is the code I have in my playground:

let str = "Say Hello to My Little Friend"
let data = str.data(using: String.Encoding.utf16)
print("\(data!)")

However, my code just prints:

"60 bytes\n"

How can I print the hex value? For reference, it should be:

5361792048656c6c6f20746f204d79204c6974746c6520467269656e64

score 55 · Answer 1 · answered Oct 17 '16 at 14:02

55

Since Data is a Sequence of UInt8, you could map each byte to a string and then join them:

data.map { String(format: "%02x", $0) }.joined()

answered Oct 17 '16 at 14:02

kennytm

2

I like this better than the accepted answer because it gives the programmer complete control of the output format. – JeremyP Oct 17 '16 at 14:31
2

var dataMap = data.map { String(format: "%02x", $0)}.joined(); print("\(dataMap)") – utarid Jul 29 '18 at 15:51

vadian · Accepted Answer · 2018-08-20T12:12:30.940

36

Just

print(data! as NSData)

PS: Your expected hex is .utf8

edited Aug 20 '18 at 12:12

answered Oct 17 '16 at 13:54

vadian

2 Answers2