iOS 修改网络图片的大小 宽和高

时间：2023-02-26 00:18:25
//image宽和高 好用

NSString *strTemplateHTML = [NSString stringWithFormat:@"<html><head><style>img{max-width:320.0;height:auto !important;width:auto !important;};</style></head><body style='margin:0; padding:0;'>%@</body></html>", @"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:@"<html> \n"

                            "<head> \n"

                            "<style type=\"text/css\"> \n"

                            "body {font-size:%fpx; line-height:%fpx;background-color: transparent;}\n"

                          //  "img{max-width:305;height:auto !important;width:auto !important;};"

                            ".img {width:305.0;}"//关键是这句给所有网络图片设宽度

                            "</style> \n"

                            "</head> \n"

                            "<body>%@</body> \n"

                            "</html>",  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();"];

}

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