wkWebView 自适应大小

       NSString *jScript = @"var meta = document.createElement('meta'); meta.setAttribute('name', 'viewport'); meta.setAttribute('content', 'width=device-width'); document.getElementsByTagName('head')[0].appendChild(meta);";
        
        WKUserScript *wkUScript = [[WKUserScript alloc] initWithSource:jScript injectionTime:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:YES];
        WKUserContentController *wkUController = [[WKUserContentController alloc] init];
        [wkUController addUserScript:wkUScript];
        
        WKWebViewConfiguration *wkWebConfig = [[WKWebViewConfiguration alloc] init];
        wkWebConfig.userContentController = wkUController;
        
        _myWebView = [[WKWebView alloc] initWithFrame:CGRectMake(0,CGRectGetMaxY(headerView.frame)+10, M_S.width,M_S.height - CGRectGetMaxY(headerView.frame) - 40) configuration:wkWebConfig];

本文参考与http://stackoverflow.com/questions/26295277/wkwebview-equivalent-for-uiwebviews-scalespagetofit