Swift Convert Integer to 2 character Hex String

Question

I am trying to get a two character hex value from an integer:

let hex = String(format:"%2X", 0)
print ("hex = \(hex)")

hex = "0"

How can I format String to result in always 2 characters, in this case I would want

hex = "00"

Answer 1

You can add a padding 0 before the formatter string:

let hex = String(format:"%02X", 0)

Result:

let hex = String(format:"%02X", 0) // 00
let hex = String(format:"%02X", 15) // 0F
let hex = String(format:"%02X", 16) // 10