How to fill a HTML form using Objective-C - ios

Question

I would like to load a web page (containing a form: username and password) in a UIWebView, but I would like the web page to be filled when the UIWebView is loaded. I read so much stuff and tried so many things, but nothing works.
here is my code :
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:#"https://login.live.com"]];
// Specify that it will be a POST request
request.HTTPMethod = #"POST";
// This is how we set header fields
[request setValue:#"application/xml; charset=utf-8" forHTTPHeaderField:#"Content-Type"];
[request setValue:#"username" forHTTPHeaderField:#"session[email]"];
// Convert your data and set your request's HTTPBody property
NSString *stringData = #"some data";
NSData *requestBodyData = [stringData dataUsingEncoding:NSUTF8StringEncoding];
request.HTTPBody = requestBodyData;
// Create url connection and fire request
NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self];
[self.webView loadRequest:request];

Answer 1

Let's say you have a form field defined like this:
<input type="text" id="mytext">
Then you can assign a value to this field as follows:
NSString *javascript = #"document.getElementById('mytext').value = 'new value'";
[webView stringByEvaluatingJavaScriptFromString:javascript];
The above code needs to run after your page has fully loaded. For example, you can make your view controller implement UIWebViewDelegate, declare the method - (void)webViewDidFinishLoad:(UIWebView *)webView and do it there.

Answer 2

EDITED: 20/03/2014 -: I added how to get the code from the UIWebView
If you want know when the page did finish loading, you should implement UIWebViewDelegate in your UIViewController:
Then you can detect when the page finish loading by implementing this method:
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
UIApplication* app = [UIApplication sharedApplication];
app.networkActivityIndicatorVisible = NO;
[_activityIndicator stopAnimating];
_activityIndicator.hidden = TRUE;
}
In you case, you want to modify the code when the page it's loaded, so in the method (void)webViewDidFinishLoad:(UIWebView *)webView you should do the next to get the code as a NSString:
NSURL *requestURL = [[yourWebView request] URL];
NSError *error;
NSString *page = [NSString stringWithContentsOfURL:requestURL encoding:NSASCIIStringEncoding error:&error];
For more details take a look to this answer.
I hope this help you.