uiwebview zoom programmatically

Question

I want to change the UIWebView zoom level programmatically.

I have tried these but they are not worked for me ;

    UIScrollView *sv = [theWebView.subviews objectAtIndex:0];
 [sv setZoomScale:50 animated:YES];

also,

  [theWebView stringByEvaluatingJavaScriptFromString:@"document.body.style.zoom = 5.0;"];

Any idea?

Answer 1

This is the only way I could find to accomplish it: (specify your own sizes if you wish, i was attempting to zoom out after typing into a form field)

UIScrollView *sv = [[webViewView subviews] objectAtIndex:0];
[sv zoomToRect:CGRectMake(0, 0, sv.contentSize.width, sv.contentSize.height) animated:YES];

Answer 2

I would use:

UIScrollView * sv = self.theWebview.scrollView;

[sv setZoomScale:50];

where self is the viewController containing the webView.

Your problem could be the size of your zoomScale exceeds the size of sv.maximumZoomScale.