UIWebView获得内容的高－作出自适应高的UIWebView
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
NSString *height_str= [webView stringByEvaluatingJavaScriptFromString: @"document.body.offsetHeight"];
int height = [height_str intValue];
webView.frame = CGRectMake(0,0,320,height);
NSLog(@"height: %@", [webView stringByEvaluatingJavaScriptFromString: @"document.body.offsetHeight"]);
}
IOS UIWebView截获html并修改便签内容,宽度自适应
iosuiwebview宽度自适应
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
Java代码 收藏代码
<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
Java代码 收藏代码
- (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：
Java代码 收藏代码
//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);"];
Java代码 收藏代码
//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 收藏代码
//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();"];