UIWebView and local css file

Question

I want to style a web page meant for the desktop so that it is presentable on a UIWebView on iPhone. I do not have access to the web server from which the pages originate. I would like to do this by changing the href attribute of the <link> stylesheet element programmatically.

I do the following with my IBOutlet UIWebView *webView.

NSString *cssPath = [[NSBundle mainBundle] pathForResource:@"MyStyleSheet" 
                                                    ofType:@"css"];
NSString *js = @"document.getElementsByTagName('link').setAttribute('href','";
NSString *js2 = [js stringByAppendingString:cssPath];
NSString *finalJS = [js2 stringByAppendingString:@"');"];

//check element structure
NSString *res = [webView stringByEvaluatingJavaScriptFromString:finalJS]; 

This does not work. Using the [webView stringByEvaluatingJavaScriptFromString:] message and making a change to the backgroundColor of the body does indeed work - done as an exercise to see if I was using the call correctly.

Am I barking up the wrong tree?

Answer 1

You can load CSS from local project directory

NSString *path = [[NSBundle mainBundle] bundlePath];
NSURL *baseURL = [NSURL fileURLWithPath:path];
[webView loadHTMLString:htmlString baseURL:baseURL];

detail info check this site : http://iphoneincubator.com/blog/windows-views/uiwebview-revisited

Answer 2

Unfortunately UIWebView doesn't provide an API for intercepting and modifying the requests that it makes while loading a resource. This means that any approach you try will be hack-ish to a certain extent.

The first approach I would try is:

• Provide your own UIWebViewDelegate delegate on the view.
• Implement -webView:shouldStartLoadWithRequest:navigationType: and return NO when you spot the CSS requests being made.
• Once the view has finished loading the main resource, use -stringByEvaluatingJavaScriptFromString: to inject JavaScript into the page that dynamically loads/sets the stylesheet that you want to use.

In the JavaScript I would create an entirely new <link> element/node on the document instead of trying to modify the existing one.

Answer 3

Your code should work, if you choose index 0 of the found elements:

    NSString *js = @"document.getElementsByTagName('link')[0].setAttribute('href','";
    NSString *js2 = [js stringByAppendingString:cssPath];
    NSString *finalJS = [js2 stringByAppendingString:@"');"];
    [webview stringByEvaluatingJavaScriptFromString:finalJS];

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