wkwebview手机屏幕适配

第一种：发现小于屏幕宽度的图片并不会被拉的屏幕一样宽

    WKUserContentController *userContentController = [[WKUserContentController alloc] init];

    WKWebViewConfiguration *wkWebConfig = [[WKWebViewConfiguration alloc] init];

   // 自适应屏幕宽度js

    NSString *jScript = @"var meta = document.createElement('meta'); meta.setAttribute('name', 'viewport'); meta.setAttribute('content', 'width=device-width'); document.getElementsByTagName('head')[0].appendChild(meta);";

   WKUserScript *wkUserScript = [[WKUserScript alloc] initWithSource:jScript injectionTime:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:YES];

    // 添加自适应屏幕宽度js调用的方法

    [userContentController  addUserScript:wkUserScript];

    wkWebConfig.userContentController= userContentController;

    WKWebView*webview =[[WKWebViewalloc]initWithFrame:self.view.boundsconfiguration:wkWebConfig];

    webview.navigationDelegate =self;

    [webviewloadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://app.elcst.com/index.php?ctl=goods&act=goods_body&goods_id=1600"]]];//https://baidu.com

    [self.viewaddSubview:webview];

第二种：

实现这个WKNavigationDelegate 代理方法，解决了第一种方法存在的不足

- (void)webView:(WKWebView*)webView didFinishNavigation:(null_unspecifiedWKNavigation*)navigation{

    [webViewevaluateJavaScript:@"var script = document.createElement('script');"

     "script.type = 'text/javascript';"

     "script.text = \"function ResizeImages() { "

     "var myimg,oldwidth;"

     "var maxwidth = 1000.0;" // UIWebView中显示的图片宽度

     "for(i=0;i

     "myimg = document.images[i];"

     "oldwidth = myimg.width;"

     "myimg.width = maxwidth;"

     "}"

     "}\";"

     "document.getElementsByTagName('head')[0].appendChild(script);ResizeImages();" completionHandler:nil];

}