Load page into webview swift 2 from java class - swift

Question

I am developing an App for the iPhone using Xwebview which enables me to download a page then interact with the javascript on the downloaded page.
All works, but if the internet connection drops, a default local page is loaded, informing the user there is no internet connection. The page displays a retry button that, when pressed checks, the internet connection: if the connection is made the app tries to connect again to the external page and load the page into the webview.
I cannot get this to work: the code downloads the page (I can see this in my session data) but I can't get that page to load back into the webview.
override func viewDidLoad() {
super.viewDidLoad()
login()
}
func login()
{
// *********** Get stored hashkey **************
let hashcode = getHashcode()
// ********** Check network connection *********
let netConnection = Connection.isConnectedToNetwork()
print("net connection: ", netConnection)
if netConnection == true
{
if hashcode != "00000"
{
print("local key found", hashcode)
// We dont have local key
let webview = WKWebView(frame: view.frame, configuration: WKWebViewConfiguration())
//webview.loadRequest(NSURLRequest(URL: NSURL(string: "about:blank")!))
view.addSubview(webview)
webview.loadPlugin(jsapi(), namespace: "jsapi")
let url:NSURL = NSURL(string: serverLocation + onlineLoginApi)!
let session = NSURLSession.sharedSession()
let request = NSMutableURLRequest(URL: url)
request.HTTPMethod = "POST"
request.cachePolicy = NSURLRequestCachePolicy.ReloadIgnoringCacheData
let paramString = "/?username=username&password=password"
request.HTTPBody = paramString.dataUsingEncoding(NSUTF8StringEncoding)
let task = session.downloadTaskWithRequest(request) {
(
let location, let response, let error) in
guard let _:NSURL = location, let _:NSURLResponse = response where error == nil else {
print("error")
return
}
let urlContents = try! NSString(contentsOfURL: location!, encoding: NSUTF8StringEncoding)
guard let _:NSString = urlContents else {
print("error")
return
}
print(urlContents)
}
task.resume()
// you must tell webview to load response
webview.loadRequest(request)
}
else{
print("local key found", hashcode)
// ********* Found local key go to site pass key over ************
let webview = WKWebView(frame: view.frame, configuration: WKWebViewConfiguration())
view.addSubview(webview)
webview.loadPlugin(jsapi(), namespace: "jsapi")
let req = NSMutableURLRequest(URL: NSURL(string:serverLocation + onlineLoginApi + "?hashcode=\(hashcode)")!)
req.HTTPMethod = "POST"
req.HTTPBody = "/?hashcode=\(hashcode)".dataUsingEncoding(NSUTF8StringEncoding)
NSURLSession.sharedSession().dataTaskWithRequest(req)
{ data, response, error in
if error != nil
{
//Your HTTP request failed.
print(error!.localizedDescription)
} else {
//Your HTTP request succeeded
print(String(data: data!, encoding: NSUTF8StringEncoding))
}
}.resume()
webview.loadRequest(req)
}
}
else{
// No connection to internet
let webview = WKWebView(frame: view.frame, configuration: WKWebViewConfiguration())
view.addSubview(webview)
webview.loadPlugin(jsapi(), namespace: "jsapi")
let root = NSBundle.mainBundle().resourceURL!
let url = root.URLByAppendingPathComponent("/www/error-no-connection.html")
webview.loadFileURL(url, allowingReadAccessToURL: root)
print("No internet connection")
}
}
class jsapi: NSObject {
// Reconnect button on interface
func retryConnection()
{
print("Reconnect clicked")
dispatch_async(dispatch_get_main_queue())
{
let netConnections = Connection.isConnectedToNetwork()
if netConnections == true {
let netalert = UIAlertView(title: "Internet on line", message: nil, delegate: nil, cancelButtonTitle: "OK")
netalert.show()
let url = self.serverLocation + self.onlineLoginApi
let hashcode = ViewController().getHashcode()
if(hashcode != "00000") {
let url = url + "?hashcode=\(hashcode)"
print("url: ", url)
}
ViewController().loadPagelive(url)
}
else{
let netalert = UIAlertView(title: "Internet off line", message: nil, delegate: nil, cancelButtonTitle: "OK")
netalert.show()
}
}
print("retryConnect end")
}
}

Answer 1

You try to perform the loadPagelive(url) on a new instance of your ViewController, not on the current one shown on the screen, that's why you don't see any update.
You should create a delegate or a completion block in order to execute code on you ViewController instance loaded on the screen: every time you do ViewController(), a new object is created.
You can try using the delegate pattern, which is simple to achieve. I will try to focus on the important part and create something that can be used with your existing code:
class ViewController: UIViewController {
let jsapi = jsapi() // You can use only 1 instance
override func viewDidLoad() {
super.viewDidLoad()
// Set your ViewController as a delegate, so the jsapi can update it
jsapi.viewController = self
login()
}
func loadPagelive(_ url: URL) {
// Load page, probably you already have it
}
}
class jsapi: NSObject {
weak var viewController: ViewController?
func retryConnection() {
// We check if the delegate is set, otherwise it won't work
guard viewController = viewController else {
print("Error: delegate not available")
}
[... your code ...]
// We call the original (and hopefully unique) instance of ViewController
viewController.loadPagelive(url)
}
}