方法一：
NSString *htmls = [NSString stringWithFormat:@"<html> /n"
"<head> /n"
"<style type=/"text/css/"> /n"
"body {font-size:15px;}/n"
"</style> /n"
"</head> /n"
"<body>"
"<script type='text/javascript'>"
"window.onload = function(){/n"
"var $img = document.getElementsByTagName('img');/n"
"for(var p in $img){/n"
" $img[p].style.width = '100%%';/n"
"$img[p].style.height ='auto'/n"
"}/n"
"}"
"</script>%@"
"</body>"
"</html>",htmlString];
[self.webView loadHTMLString:htmlString baseURL:nil];
方法二：
[webView stringByEvaluatingJavaScriptFromString:
@"var script = document.createElement('script');"
"script.type = 'text/javascript';"
"script.text = /"function ResizeImages() { "
"var myimg,oldwidth;"
"var maxwidth=300;" //缩放系数 改变参数控制图片缩放大小
"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();"];
方法三：
- (void)webViewDidFinishLoad:(UIWebView *)webView {
NSString *js = @"function imgAutoFit() { /
var imgs = document.getElementsByTagName('img'); /
for (var i = 0; i < imgs.length; ++i) {/
var img = imgs[i]; /
img.style.maxWidth = %f; /
} /
}";
js = [NSString stringWithFormat:js, [UIScreen mainScreen].bounds.size.width - 20];
[webView stringByEvaluatingJavaScriptFromString:js];
[webView stringByEvaluatingJavaScriptFromString:@"imgAutoFit()"];
}
方法四：
将scalesPageToFit属性设置为YES
mywebView.scalesPageToFit = YES;
原创文章，作者：ItWorker，如若转载，请注明出处：https://blog.ytso.com/tech/pnotes/98549.html