ios端简单改变webView的黑白夜模式

extension HTController:WKUIDelegate, WKNavigationDelegate,WKScriptMessageHandler {

func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {

if message.name == "setTitle" {

let body = message.body

print(NSLocalizedString("点击了这个方法\(body)",  comment: ""))

}

}

func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {

let colorStyle:String = kUserDefaults.string(forKey: "ColorStyle")!

if colorStyle != "day" {

webView.evaluateJavaScript("document.getElementsByTagName('body')[0].style.background='#333333'", completionHandler: nil)

webView.evaluateJavaScript("document.getElementsByTagName('body')[0].style.webkitTextFillColor= 'white'", completionHandler: nil)

webView.evaluateJavaScript("document.getElementsByTagName('body')[0].style.webkitTextSizeAdjust= '300%", completionHandler: nil)

}else{

webView.evaluateJavaScript("document.getElementsByTagName('body')[0].style.background='#ffffff'", completionHandler: nil)

webView.evaluateJavaScript("document.getElementsByTagName('body')[0].style.webkitTextFillColor= 'black'", completionHandler: nil)

webView.evaluateJavaScript("document.getElementsByTagName('body')[0].style.webkitTextSizeAdjust= '300%", completionHandler: nil)

}

}

}