HTML Content fit in UIWebview without zooming out

Question

I am making use of the UIWebView to render some HTML. However, although the width of my webview is 320 my HTML is still shown full width and can be scrolled hor

Answer 1

Here's what you do:

In your UI controller that owns the web view, make it a UIWebViewDelegate. Then where you set the URL to load, set the delegate as the controller:

NSString *urlAddress = @"http://dl.dropbox.com/u/50941418/2-build.html";
NSURL *url = [NSURL URLWithString:urlAddress];
NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
[webView loadRequest:requestObj];  
webView.delegate = self;

And finally implement the webViewDidFinishLoad: to correctly set the zoom level:

This option will applicable from iOS 5.0 and >

- (void)webViewDidFinishLoad:(UIWebView *)theWebView
{
  CGSize contentSize = theWebView.scrollView.contentSize;
  CGSize viewSize = theWebView.bounds.size;

  float rw = viewSize.width / contentSize.width;

  theWebView.scrollView.minimumZoomScale = rw;
  theWebView.scrollView.maximumZoomScale = rw;
  theWebView.scrollView.zoomScale = rw;  
}

I hope this helps...

Option B, you can try to alter the HTML (this example does the job but is less than perfect from an HTML parsing standpoint. I just wanted to illustrate my point. It does work for your example, and probably most cases. The inset of 40 can probably be detected programmatically, I didn't try to research that.

NSString *urlAddress = @"http://dl.dropbox.com/u/50941418/2-build.html";
NSURL *url = [NSURL URLWithString:urlAddress];

NSString *html = [NSString stringWithContentsOfURL:url encoding:[NSString defaultCStringEncoding] error:nil];
NSRange range = [html rangeOfString:@"<body"];

if(range.location != NSNotFound) {
  // Adjust style for mobile
  float inset = 40;
  NSString *style = [NSString stringWithFormat:@"<style>div {max-width: %fpx;}</style>", self.view.bounds.size.width - inset];
  html = [NSString stringWithFormat:@"%@%@%@", [html substringToIndex:range.location], style, [html substringFromIndex:range.location]];
}

[webView loadHTMLString:html baseURL:url];

Answer 2

Swift 3:

Use this extension to resize contents of webview according to size of a webview.

extension UIWebView {
    ///Method to fit content of webview inside webview according to different screen size
    func resizeWebContent() {
        let contentSize = self.scrollView.contentSize
        let viewSize = self.bounds.size
        let zoomScale = viewSize.width/contentSize.width
        self.scrollView.minimumZoomScale = zoomScale
        self.scrollView.maximumZoomScale = zoomScale
        self.scrollView.zoomScale = zoomScale
    }
}

How to invoke?

webViewOutlet.resizeWebContent()