如何记住UIWebView的滚动位置

Question

In Safari, when you

1. Visit a very long page, eg w3c.org, scroll down to somewhere in the page
2. Kill Safari
3. Open Safari again, it will automatically remember your last position within a page

How to do this in UIWebView ? Or is it possible?

Thanks.

Answer 1

The simplest way I can think of to achieve this would be to save the web views contentOffset.y and then set it back to what you saved the next time it is loaded.

Saving this into NSUserDefaults will allow the value to be restored even if the app is killed, or even if an update is installed.

[[NSUserDefaults standardUserDefaults] setFloat:myWebView.scrollView.contentOffset.y forKey:@"offsetKey"];
[[NSUserDefaults standardUserDefaults] synchronize];

Then to restore:

- (void)webViewDidFinishLoad:(UIWebView *)webView
{
    [myWebView.scrollView setContentOffset:CGPointMake(0, [[NSUserDefaults standardUserDefaults] floatForKey:@"offsetKey"]) animated:YES];
}

^^Untested, let me know how it works for you.