解决在UIWebView上页面显示正常,升级成WKWebView之后页面缩小的问题

有时候在WKWebView加载页面后会发现页面的字会很小, 这是因为原网页没有做手机屏幕尺寸的适配, 那么在后台不做调整的情况下我们移动端怎样来适配页面呢?
以下代码可以适配大小:

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;  
          
WKWebView *webView = [[WKWebView alloc] initWithFrame:self.view.frame configuration:wkWebConfig];  
[self.view addSubview:webView];  
webView.navigationDelegate = self;