swift3 webview with post request - swift3

Question

I am running a school project and I am new from swift3.
By searching, I know how to pass a data from one view to anther:
Passing data from a tableview to webview
In the post above, he is using http get request to pass data to website, then reload the webivew:
let URL = NSURL(string: "https://www.example.com?data=\(passData)")
webView.loadRequest(NSURLRequest(url: URL! as URL) as URLRequest)
I see some useful links like about code with http post request in here:
HTTP Request in Swift with POST method. In a result, the code can print out the http response.
My question is that, how to implement a webview with sending a http post reuqest, like id, name, etc, instead of get method.
In anther words: I want to reload the webview(like example.com) and that website will contain the value I sent via http post request.
example.com:
$id = $_POST['id'];
echo $id;
Thanks.

Answer 1

Just create a URLRequest for POST as shown in the second link, and pass it to the webView:
var request = URLRequest(url: URL(string: "http://www.example.com/")!)
request.httpMethod = "POST"
let postString = "id=\(idString)"
request.httpBody = postString.data(using: .utf8)
webView.loadRequest(request) //if your `webView` is `UIWebView`
(Consider using WKWebView rather than UIWebView.)
You may need idString to be escaped if it contains some special characters.
By the way, the two line code:
let URL = NSURL(string: "https://www.example.com?data=\(passData)")
webView.loadRequest(NSURLRequest(url: URL! as URL) as URLRequest)
does not seem to be a good Swift 3 code. It can be written as:
let url = URL(string: "https://www.example.com?data=\(passData)")!
webView.loadRequest(URLRequest(url: url))