iOS swift 5: HEX ASCII 字串轉換為Int

HEX ASCII 字串轉換為Int
 解決方案來源:
  Swift Int 轉 16進位字串、16進位字串轉 Int
  Swift native functions to have numbers as hex strings

 func MyFunA()
 {
  let sStr1 = "7FFF"
  let nInt = strHex2Int(sStr1)
  print( nInt)
  let sStr2 = Int2strHex( nInt).uppercased() // 轉大寫
  print( sStr2)
 }
 
 func strHex2Int(_ strHex:String) -> Int
 { /* 16進位字串轉Int */
  let nInt = Int(strHex, radix: 16)
  return nInt!
 }

 func Int2strHex(_ int:Int)-> String
 { /* Int轉16進位字串 */
  let sStr = String(int, radix: 16)
  return sStr
 }