Swift: How to convert a String to UInt8 array?

Question

How do you convert a String to UInt8 array?

var str = \"test\"
var ar : [UInt8]
ar = str

Answer 1

swift 4

 func stringToUInt8Array(){

     let str:String = "Swift 4"
     let strToUInt8:[UInt8] = [UInt8](str.utf8)

     print(strToUInt8)
 }