iOS 修改网络图片的大小 宽和高，终于解决了这个问题

//image宽和高 好用

NSString *strTemplateHTML = [NSString stringWithFormat:@"%@", @"insert your html content here"];
[webView loadHTMLString:strTemplateHTML baseURL:nil];
//代理执行时调用

网上给的下边的这个方法好像不太好用 我用了 没啥效果
- (void)webViewDidFinishLoad:(UIWebView *)webView1
{
    //修改服务器页面的meta的值 就是文本的宽高 定义成 系统手机宽高
    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];
    [webView1 stringByEvaluatingJavaScriptFromString:meta];
}

我自己写了一个js ，有点麻烦 但是对图片管理的效果很明显

如下代码：

htmlText=[jsonObj objectForKey:@"content"];
jsString = [NSString stringWithFormat:@" \n"
                            " \n"
                            " \n"
                            " \n"
                            "%@ \n"
                            "",  fontSize ,line_height,htmlText];
 NSURL *urlBai=[NSURL URLWithString:ImageWeb_Head];
                [showWebView loadHTMLString:jsString baseURL:   urlBai];
                showWebView.delegate=self;

-(void)webViewDidFinishLoad:(UIWebView *)webView
{
       [webView stringByEvaluatingJavaScriptFromString:
     @"var script = document.createElement('script');"
     "script.type = 'text/javascript';"
     "script.text = \"function ResizeImages() { "
        "var imgs = document.getElementsByTagName('img');"
        
        "for (var i = 0; i < imgs.length; i ++) {"
        " var img = imgs[i];"
        " img.style.width = 305 ;"//图片宽度我设置为305
        " img.style.height = null;"
        "}"
     "}\";"
     "document.getElementsByTagName('head')[0].appendChild(script);"];
    [webView stringByEvaluatingJavaScriptFromString:@"ResizeImages();"];
}