Problem to understand how to retrieve signature

[luesp15]

HI,
having used web3.js on the web, I'm using these libraries in the hope of finding the same functions.
However, I'm having trouble finding the equivalent for this code:

const hash = Web3.utils.soliditySha3(...message)
const signature = Web3.eth.accounts.sign(hash, privateKey).

My message is an array of String and Int.

I've tried with this :

let web3Rinkeby = Web3.InfuraRinkebyWeb3()
// discarded this part since I already have an address

    let keystore = try! EthereumKeystoreV3(password: "")
    let keystoreManager = KeystoreManager([keystore!])
    web3Rinkeby.addKeystoreManager(keystoreManager)
    let address = keystoreManager.addresses![0]
//

let data = message.data(using: .utf8)
let ethAddress = EthereumAddress(from: address)!
let signMsg = web3Rinkeby.wallet.signPersonalMessage(data!, account: ethAddress, password: "");

But the signature I receive at the end is nil.
Do you have any idea how I can do it? Considering that I already have a valid address and the privateKey.