Autofill Username and Password WKWebview Swift 3 Xcode - xcode

Question

I am trying to make an app in Swift 3 using the WKWebView class to go to a website and autofill in the Username and password. I have tried search for days and only find answers using Obj-C and old versions of swift.
I tried using the solution proposed here Autofill Username and Password UIWebView Swift
However this did not work for me in Swift 3. Here is my example code:
import Foundation
import UIKit
import WebKit
class spot: UIViewController, UIWebViewDelegate {
#IBOutlet weak var container: UIView!
var webView: WKWebView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
webView = WKWebView()
container.addSubview(webView)
}
override func viewDidAppear(_ animated: Bool) {
let frame = CGRect(x:0, y:0, width:container.bounds.width, height:container.bounds.height)
webView.frame = frame
// Insert URL below to change launched page
let urlStr = "https://login.salesforce.com/"
let url = NSURL(string: urlStr)!
let request = NSURLRequest(url: url as URL)
webView.load(request as URLRequest)
}
func webViewDidFinishLoad(_ webView: UIWebView!) {
let savedUsername = UserDefaults.standard.string(forKey: "USERNAME")
let savedPassword = UserDefaults.standard.string(forKey: "PASSWORD")
if savedUsername == nil || savedPassword == nil {return}
if ( countElements(savedUsername!) != 0 && countElements(savedPassword!) != 0) {
let loadUsernameJS = "var inputFields = document.querySelectorAll(\"input[name='username']\"); \\ for (var i = inputFields.length >>> 0; i--;) { inputFields[i].value = \'\(savedUsername)\';}"
let loadPasswordJS = "var inputFields = document.querySelectorAll(\"input[name='password']\"); \\ for (var i = inputFields.length >>> 0; i--;) { inputFields[i].value = \'\(savedPassword)\';}"
self.webView.stringByEvaluatingJavaScriptFromString(loadUsernameJS)
self.webView.stringByEvaluatingJavaScriptFromString(loadPasswordJS)
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}

Answer 1

One thing is very important here, the id (getElementById), double check that you are using correct id, which is used in your web form.
func webViewDidFinishLoad(_ webView: UIWebView) {
if (email == "" || password == "") {return}
// fill data
let fillForm = String(format: "document.getElementById('email').value = '\(email)';document.getElementById('pass').value = '\(password)';")
webView.stringByEvaluatingJavaScript(from: fillForm)
}

Answer 2

I know its a bit late but here is my code for how I have made it work. That said the server was expecting the string as I constructed it, but I am hoping you have the info on how your particular server is expecting the URLRequest to be constructed.
#IBOutlet weak var loadingWebPage: UIActivityIndicatorView!
override func viewDidLoad() {
super.viewDidLoad()
let savedUsername = UserDefaults.standard.string(forKey: "USERNAME")
let savedPassword = UserDefaults.standard.string(forKey: "PASSWORD")
let urlStr = "https://login.salesforce.com/"
myWebView = WKWebView()
myWebView.uiDelegate = self
myWebView.navigationDelegate = self
setUrlString = "\(urlStr)?username=\(savedUsername)&password=\(savedPassword)"
}
override func viewWillAppear(_ animated: Bool) {
view.addSubview(myWebView)
myWebView.translatesAutoresizingMaskIntoConstraints = false
let width = NSLayoutConstraint(item: myWebView, attribute: .width, relatedBy: .equal, toItem: view, attribute: .width, multiplier: 1.0, constant: 0)
let height = NSLayoutConstraint(item: myWebView, attribute: .height, relatedBy: .equal, toItem: view, attribute: .height, multiplier: 1.0, constant: -70)
let top = NSLayoutConstraint(item: myWebView, attribute: .top, relatedBy: .equal, toItem: view, attribute: .top, multiplier: 1.0, constant: 70)
view.addConstraints([width,height,top])
self.myWebView.addSubview(loadingWebPage)
let myURL = URL(string: setUrlString)
let myRequest = URLRequest(url: myURL!)
myWebView.load(myRequest)
}
Hope this helps.