Convert following code in to swift language

I am working on one project and need to take refrence from react code. But I don't know react. Can anyone help me to convert following code in to swift language.?It would be great if anyone can help me out.

stringToFloat(stringData){    buf = Buffer.from(stringData, 'ascii');    hex_string = buf.toString('hex');    float_num = Buffer(hex_string,'hex').readFloatLE(0);    return float_num;  }