Detect when I scroll my UIWebView at top of the page

Question

Hello

I would like to add an URL/google bar on top of my webview, and access it by scrolling up my web page exactly as Safari do. To do this, I would detect when the user is scrolling the page, and more over when the scroll reaches the top.

But I really don't know how.

An idea ? Thanx a lot.

Martin

Answer 1

Yep, you want to implement the UIScrollViewDelegate for your UIWebView.

Answer 2

Hi ,

You can use the following methods to solve your problem.

For getting the pageOffset:

int pageYOffset = [[webViewObj stringByEvaluatingJavaScriptFromString:@"window.pageYOffset"] intValue];

For getting the total scroll height of a webpage:

int scrollHeight = [[webViewObj stringByEvaluatingJavaScriptFromString:@"document.documentElement.scrollHeight"] intValue];

For scrolling the webpage to a particular offset:

[webViewObj stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@"document.body.scrollTop = %d",scrollHeight ]];