iOS: call obj-c methods using javascript in a UIWebview

Question

I am writing a function that collaborates with a JS web page. I use UIWebView to contain the webpage and then situation has become complicated when I want the web page to commun

Answer 1

Yes it does feel hacky and is a little laggy but you need to do it with the UIWebViewDelegate

function init()
{
  $('input').on('click', function(e) { answerBoxShouldBeginEditing(e); });
}

function answerBoxShouldBeginEditing(e)
{
  var object = e.toElement;

  var answer = $(object).attr('name');
  var request = 'engine:' + answer;

  var iframe = document.createElement('IFRAME');
  iframe.setAttribute('src', request);
  document.documentElement.appendChild(iframe);
  iframe.parentNode.removeChild(iframe);
  iframe = null;
}

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
  NSString *requestString = [[request URL] absoluteString];
  if ([requestString hasPrefix:@"engine:"]) {

    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Hello" message:nil delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [alert show];
    return NO;
  }
  return YES;
}