swift: hexdecimal string to double

Question

Im reading accelerometer data from an ibeacon that appears in the following string format:

x hex string value: "0160"
y hex string value: "ff14"
z hex string value: "0114"

Im expecting to see these values as double values ranging from 0g to 1g. How would you convert these hex strings into doubles in swift?

Do you really get those strings, or is that the hexadecimal representation of binary data from the beacon? — Martin R, Oct 31 '18 at 11:16
https://stackoverflow.com/questions/27189338/swift-native-functions-to-have-numbers-as-hex-strings ? — Larme, Oct 31 '18 at 13:29

score 3 · Accepted Answer · edited Oct 31 '18 at 11:15

3

Get the integer value from hex string with Int(_:radix:)

let string = "ff14"
let hexValue = Int(string, radix: 16)!

and divide by 65535 (16 bit) to get values between 0.0 and 1.0

let result = Double(hexValue) / 65535

edited Oct 31 '18 at 11:15

Martin R

answered Oct 31 '18 at 11:10

vadian

1 Answers1