Sign any message with the user’s private key and verify the signature on Ethereum

I'm trying to explore Ethereum and creating a app which let user sign message and validate the message. I'm using web3swift framework for this and what I have tried so far is as follows -

    let web3Rinkeby = Web3.InfuraRinkebyWeb3()
    let msgStr = "This is my first Ethereum App";
    let data = msgStr.data(using: .utf8)
    let signMsg = web3Rinkeby.wallet.signPersonalMessage(data!, account: address);

    print(signMsg);

but I'm not sure if this is right and how to validate any message as well. Please help.

from Sign any message with the user’s private key and verify the signature on Ethereum