How can I scroll programmatically to the bottom in a UIWebView?

Question

I know a similar question has been asked before but it seemed never been answered. I have a UIWebView and add some content by string. I use UIWebView because I add some imag

Answer 1

This is how you can scroll down Animated:

- (void)webViewDidFinishLoad:(UIWebView *)webView
{
        CGPoint bottomOffset = CGPointMake(0, self.myWebView.scrollView.contentSize.height - self.myWebView.scrollView.bounds.size.height);
        [self.myWebView.scrollView setContentOffset:bottomOffset animated:YES];
}

Answer 2

SWIFT 4.x

This is how you can scroll down Animated:

func webViewDidFinishLoad(_ webView: UIWebView) {
    var scrollHeight: CGFloat = webView.scrollView.contentSize.height - webView.bounds.size.height
    if (0.0 > scrollHeight) {
        scrollHeight = 0.0
    }
    webView.scrollView.setContentOffset(CGPoint.init(x: 0.0, y: scrollHeight), animated: true)
}

Answer 3

in iOS 5+ you could call the following method from your -(void)webViewDidFinishLoad:(UIWebView *)webView

- (void)webViewScrollToBottom:(UIWebView *)webView
{
    CGFloat scrollHeight = webView.scrollView.contentSize.height - webView.bounds.size.height;
    if (0.0f > scrollHeight)
        scrollHeight = 0.0f;
    webView.scrollView.contentOffset = CGPointMake(0.0f, scrollHeight);
}

Answer 4

This is fairly simple. First, you'll need to obtain height of the webpage:

NSInteger height = [[webView stringByEvaluatingJavaScriptFromString:@"document.body.offsetHeight;"] intValue];

Now you have the height of the document stored in the height variable. To scroll to bottom you have to use javascript again:

NSString* javascript = [NSString stringWithFormat:@"window.scrollBy(0, %d);", height];   
[webView stringByEvaluatingJavaScriptFromString:javascript];

Of course you need to call them in proper moment. That is

– webViewDidFinishLoad:(UIWebView *)webView

method of your webview delegate.

Hope this was helpful, Pawel