iOS webview 加载html字符串，设置字体和图片自适应

NSString *content = [content stringByReplacingOccurrencesOfString:@"&quot" withString:@"'"];

    content = [content stringByReplacingOccurrencesOfString:@"<" withString:@"<"];

    content = [content stringByReplacingOccurrencesOfString:@">" withString:@">"];

    content = [content stringByReplacingOccurrencesOfString:@""" withString:@"\""];

    NSString *htmls = [NSString stringWithFormat:@" \n"

                      " \n"

                      " \n"

                      " \n"

                      " \n"

                      ""

                      "%@"

                      ""

                      "",content];

    [_webView loadHTMLString:htmls baseURL:nil];