需求：混合应用UIWebView打开html后，UIWebView有左右滚动条，要去掉左右滚动效果；
方法：通过js截获UIWebView中的html，然后修改html标签内容；
实例代码：
服务器端html
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
<title>网曝四川省一考场时钟慢半小时 老师称这就是命</title></head<body>网曝四川省一考场时钟慢半小时 老师称这就是命</body></html>
这样显示的结果网页的最小宽度会是device-width；但有时候不需要这个宽度，就需要修改width=device-width为width=myWidth;
客户端代码
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
//修改服务器页面的meta的值
NSString *meta = [NSString stringWithFormat:@"document.getElementsByName(\"viewport\")[0].content = \"width=%f, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no\"", webView.frame.size.width];
[webView stringByEvaluatingJavaScriptFromString:meta];
}
这样问题就可以解决了
新增代码：
//给网页增加utf-8编码
[webView stringByEvaluatingJavaScriptFromString:
@"var tagHead =document.documentElement.firstChild;"
"var tagMeta = document.createElement(\"meta\");"
"tagMeta.setAttribute(\"http-equiv\", \"Content-Type\");"
"tagMeta.setAttribute(\"content\", \"text/html; charset=utf-8\");"
"var tagHeadAdd = tagHead.appendChild(tagMeta);"];
//给网页增加css样式
[webView stringByEvaluatingJavaScriptFromString:
@"var tagHead =document.documentElement.firstChild;"
"var tagStyle = document.createElement(\"style\");"
"tagStyle.setAttribute(\"type\", \"text/css\");"
"tagStyle.appendChild(document.createTextNode(\"BODY{padding: 20pt 15pt}\"));"
"var tagHeadAdd = tagHead.appendChild(tagStyle);"];
//拦截网页图片 并修改图片大小
[webView stringByEvaluatingJavaScriptFromString:
@"var script = document.createElement('script');"
"script.type = 'text/javascript';"
"script.text = \"function ResizeImages() { "
"var myimg,oldwidth;"
"var maxwidth=380;" //缩放系数
"for(i=0;i <document.images.length;i++){"
"myimg = document.images[i];"
"if(myimg.width > maxwidth){"
"oldwidth = myimg.width;"
"myimg.width = maxwidth;"
"myimg.height = myimg.height * (maxwidth/oldwidth);"
"}"
"}"
"}\";"
"document.getElementsByTagName('head')[0].appendChild(script);"];
[webView stringByEvaluatingJavaScriptFromString:@"ResizeImages();"];
在oc中更改HTML5内容
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
NSString *headerStr = @"document.getElementsByTagName('h1')[0].innerText = '测试文字';";
[webView stringByEvaluatingJavaScriptFromString:headerStr];
NSString *downLoadStr = @"document.getElementById('xiazaiapp').getElementsByTagName('a')[0].innerText = '下个鸡蛋';";
[webView stringByEvaluatingJavaScriptFromString:downLoadStr];
}
其他html属性重载和此方法类似；
参考网址：
（stringByEvaluatingJavaScriptFromString的使用方法）http://www.uml.org.cn/mobiledev/201108181.asp
（ iphone 获取UIWebView内Html方法）http://blog.****.net/diyagoanyhacker/article/details/6564897
（IOS UIWebView引用外部CSS样式）http://hi.baidu.com/jwq359699768/item/780879e5c98bfb3e4ddcaf22
http://blog.****.net/xdonx/article/details/6973521