ios UIWebView截获html并修改便签内容

时间 2019-12-18

标签 ios uiwebview 截获 html 并修便签内容栏目 iOS 繁體版

原文原文链接

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：经过js截获UIWebView中的html，而后修改html标签内容；
实例代码：
服务器端htmljavascript

<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；但有时候不须要这个宽度，就须要修改width=device-width为width=myWidth;
客户端代码css

- (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];  
}

这样问题就能够解决了
新增代码： html

//给网页增长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);"];  

//给网页增长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];

}

其余html属性重载和此方法相似；
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.csdn.net/diyagoanyhacker/article/details/6564897
（IOS UIWebView引用外部CSS样式）http://hi.baidu.com/jwq359699768/item/780879e5c98bfb3e4ddcaf22
http://blog.csdn.net/xdonx/article/details/6973521java