Converting Hex String to NSData in Swift

Question

I got the code to convert String to HEX-String in objective-C.

- (NSString *) CreateDataWithHexString:(NSString*)inputString
{
NSUInteger inLength = [inputSt         


        

Answer 1

The code worked for me in Swift 3.0.2.

extension String {
    /// Expanded encoding
    ///
    /// - bytesHexLiteral: Hex string of bytes
    /// - base64: Base64 string
    enum ExpandedEncoding {
        /// Hex string of bytes
        case bytesHexLiteral
        /// Base64 string
        case base64
    }

    /// Convert to `Data` with expanded encoding
    ///
    /// - Parameter encoding: Expanded encoding
    /// - Returns: data
    func data(using encoding: ExpandedEncoding) -> Data? {
        switch encoding {
        case .bytesHexLiteral:
            guard self.characters.count % 2 == 0 else { return nil }
            var data = Data()
            var byteLiteral = ""
            for (index, character) in self.characters.enumerated() {
                if index % 2 == 0 {
                    byteLiteral = String(character)
                } else {
                    byteLiteral.append(character)
                    guard let byte = UInt8(byteLiteral, radix: 16) else { return nil }
                    data.append(byte)
                }
            }
            return data
        case .base64:
            return Data(base64Encoded: self)
        }
    }
}