objective c - ios webview loadHTML string with link css -

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i load html string in link local css file lies in docment folder,

...<head><link href="a.css">...</head>...

then call webview.loadhtml:htmlstring baseurl:docurl; css loaded ok. change a.css 's body {background:url(b.gif);} //previous a.gif, pop webview's view controller, , re-push new 1 in webview load same html string link same css body's background image has been changed. comes problem: times webview load changed background, while times load old image though css changed! , maybe realloc view controller times, maybe load right one! can teach me how fix it? lot!


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