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iOS獲取webView的內容高度

- (void)webViewDidFinishLoad:(UIWebView *)webView

{

CGFloat height = [[webView stringByEvaluatingJavaScriptFromString:@"document.body.offsetHeight"] floatValue];

    CGRect frame = webView.frame;

    webView.frame = CGRectMake(frame.origin.x, frame.origin.y, frame.size.width, height);

}