解决方法在获取的HTML代码前面添加一段header设置.代码如下
//自适应屏幕宽度,另maximum-scale=1.0, minimum-scale=1.0 设置这两个参数可以禁止缩放网页
NSString *headerStr = @" <head><meta name='viewport' content='width=device-width, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0,user-scalable=no'> <style>img{max-width: 100%; width:auto; height:auto;}</style></head>img{max-width: 100%; width:auto; height:auto;}";
NSString *htmlStr = [NSStringstringWithFormat:@"%@%@",headerStr,getHtml];
[self.webView loadHTMLString:htmlStr baseURL:nil];
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