Bytes to Data

let bytes: UInt8 = [0x01, 0x10]
let data = Data.init(bytes: bytes)

Data to Bytes

let bytes = [UInt8](data)

Hex String to Data

extension String { 

func hexadecimal() -> Data? { 
var data = Data(capacity: characters.count / 2) 
let regex = try! NSRegularExpression(pattern: "[0-9a-f]{1,2}", options: .caseInsensitive) 
regex.enumerateMatches(in: self, range: NSMakeRange(0, utf16.count)) { match, flags, stop in 
let byteString = (self as NSString).substring(with: match!.range) 
var num = UInt8(byteString, radix: 16)! 
data.append(#, count: 1) 
} 
guard data.count > 0 else { return nil } 
return data 
} 
} 

Data to Hex String

extension Data { 

func hexadecimal() -> String { 
return map { String(format: "%02x", $0) } 
.joined(separator: "") 
} 
} 

hexString轉(zhuǎn)Data的用法:

let hexString = "68656c6c 6f2c2077 6f726c64" 
let data:Data = (String.hexadecimal(hexString)())!