Managing vertical scrolling in a UIWebView - ios

Question

I try to get a content editable UIWebView with a "normal" scrolling operation, so that when the text cursor is going to be hidden by the keyboard, the UIWebView scrolls to prevent that. I read the "Managing the Keyboard" document from iOS developer library and got no result, using the scrollView property of my UIWebView. I also found numerous tricks on the web, using ScrollView properties/methods or javascript commands but cannot obtain a normal scrolling operation, like any NSTextView does on MacOS for example. Do you know any solution to this problem?
[EDITED] Got the solution, and created a method fired by a NSTimer. To get the caret Y position, one should get the selection of the active element, and insert a dummy node. Then getting the node.offsetTop property gives the caretY. Do not forget the remove the node...

Answer 1

Ok, here is the way Apple does it in their examples (I no longer remember what project name that was):
1.You register for keyboard notifications(the keyboard send a notification every time it shows up or it gets hidden):
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(keyboardWasShown:)
name:UIKeyboardDidShowNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(keyboardWillBeHidden:)
name:UIKeyboardWillHideNotification object:nil];
2.Get the keyboard's size (you are interested in the height) and scroll if that point is not contained in the view:
- (void)keyboardWasShown:(NSNotification*)aNotification
{
NSDictionary* info = [aNotification userInfo];
CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
// If active text field is hidden by keyboard, scroll it so it's visible
CGRect aRect = self.view.frame;
aRect.size.height -= kbSize.height;
CGPoint point;
point = CGPointMake(0, activeTextField.frame.origin.y + activeTextField.frame.size.height);
if (!CGRectContainsPoint(aRect, point ))
{
CGPoint scrollPoint = CGPointMake(0.0, activeTextField.frame.origin.y+activeTextField.frame.size.height-kbSize.height);
[scrollView setContentOffset:scrollPoint animated:YES];
}
Don't forget do reverse things when hiding keyboard and remove the observers if you push to another view controller.
This example is used with text fields on a UIScrollView but I'm sure you can easily adapt it.
Personally if I also manage the web side, I prefer to create the webpages 320px wide, set my webView sizeToFit, add it on top of a UIScrollView and manage the scrolling from there. For textFields, I simply get the container for the selected textField using javascript and get it's coordinates.