ios UIWebView截获html并修改便签内容
ios UIWebView截获html并修改便签内容
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ios UIWebView截获html并修改便签内容
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:
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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Java代码 %!(EXTRA markdown.ResourceType=, string=, string=)
- - (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:
Java代码 %!(EXTRA markdown.ResourceType=, string=, string=)
- //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);”];
Java代码 %!(EXTRA markdown.ResourceType=, string=, string=)
- //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);”];
Java代码 %!(EXTRA markdown.ResourceType=, string=, string=)
- //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();”];
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](http://uml.org.cn/mobiledev/201108181.asp)
( iphone 获取UIWebView内Html方法)http://blog.[csdn.net/diyagoanyhacker/article/details/6564897](http://csdn.net/diyagoanyhacker/article/details/6564897)
(IOS UIWebView引用外部CSS样式)http://hi.[baidu.com/jwq359699768/item/780879e5c98bfb3e4ddcaf22](http://baidu.com/jwq359699768/item/780879e5c98bfb3e4ddcaf22)


