A method to retrieve byte array and bit array from Data in Swift 3

bytes_handler.swift

// Using UInt8 as Byte
typealias Byte = UInt8
enum Bit: Int {
    case zero, one
}

extension Data {
    var bytes: [Byte] {
        var byteArray = [UInt8](repeating: 0, count: self.count)
        self.copyBytes(to: &byteArray, count: self.count)
        return byteArray
    }
}

extension Byte {
    var bits: [Bit] {
        let bitsOfAbyte = 8
        var bitsArray = [Bit](repeating: Bit.zero, count: bitsOfAbyte)
        for (index, _) in bitsArray.enumerated() {
            // Bitwise shift to clear unrelevant bits
            let bitVal: UInt8 = 1 << UInt8(bitsOfAbyte - 1 - index)
            let check = self & bitVal
            
            if check != 0 {
                bitsArray[index] = Bit.one
            }
        }
        return bitsArray
    }
}

// Example
let originString = "hello world"
let strData = originString.data(using: .utf8)!
print(strData.bytes)
print(strData.bytes.first?.bits)

is it possible return bits array to bytes ?