UIWebView's scrolling after textfield focus - ios

Question

I have UIView and UIWebView on screen. When I click on text field in website, web view content is going up. How could I force UIView to move as well then?

Answer 1

You can subscribe to either the UIKeyboardWillShowNotification or the UIKeyboardDidShowNotification, and move your UIView when you receive the notification. This process is described here:
Text, Web, and Editing Programming Guide for iOS: “Moving Content That Is Located Under the Keyboard”

Answer 2

Maybe this helps: I didn't want the UIWebView to scroll at all, including when focusing on a textfield.
You have to be the delegate of the UIWebView:
_webView.scrollView.delegate = self;
And then add this method
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
scrollView.contentOffset = CGPointZero;
}

Answer 3

UIWebView has a callback:
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
This is triggered whenever a new URL request is about to load. From javascript, you could trigger a new request URL on the onfocus event of the tag, with a custom schema like:
window.location = "webViewCallback://somefunction";
Here's a script to put your custom event inside any html page to load.
You'll have to get the whole HTML before loading it to the UIWebView like this:
NSString *html = [NSString stringWithContentsOfURL:[NSURL URLWithString:#"your URL"] encoding:NSUTF8StringEncoding error:nil];
Then insert the following inside the HTML text in a appropriate place:
<script>
var inputs = document.getElementsByTagName('input');
for(int i = 0; i < inputs.length; i++)
{
if(inputs[i].type = "text")
{
inputs[i].onfocus += "javascript:triggerCallback()";
}
}
function triggerCallback()
{
window.location = "webViewCallback://somefunction";
}
</script>
Then, on the callback you should do something like this:
-(BOOL) webView:(UIWebView *)inWeb shouldStartLoadWithRequest:(NSURLRequest *)inRequest navigationType:(UIWebViewNavigationType)inType {
if ( [[inRequest URL] scheme] == #"webViewCallback" ) {
//Change the views position
return NO;
}
return YES;
}
That's it. Hope it helps.

Answer 4

Wow, I had the same problem few days ago, it was really annoying. I figured out that window.yPageOffset is changing, but as far as I know there aren't any events to bind when it changes. But maybe it will help you somehow. ;-)

Answer 5

I think you overwrote scrollViewDidScroll wrong.
You need to implement custom class for UIWevView and overwrite scrollViewDidScroll:
- (void) scrollViewDidScroll:(UIScrollView *)scrollView{
[super scrollViewDidScroll:scrollView];
[((id<UIScrollViewDelegate>)self.delegate) scrollViewDidScroll:scrollView];
}