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在webView加載完成的代理方法中添加一下代碼

[self.webView stringByEvaluatingJavaScriptFromString:@"function assignImageClickAction(){var imgs=document.getElementsByTagName('img');var length=imgs.length;for(var i=0;i<length;i++){img=imgs[i];img.onclick=function(){window.location.href='image-preview:'+this.src}}}"];

    

    [self.webView stringByEvaluatingJavaScriptFromString:@"assignImageClickAction();"];

在代理方法中攔截便可