iOS-WKWebview高度问题

1.注入js代码

// 	提取html文件中所有图片标签，修改宽度为屏幕宽度，高度自适应
		
	let js = "function resetImages () {" +
		            "var imgstyle=document.getElementsByTagName('img');" +
		            "for(var i=0;i<imgstyle.length;i++){" +
		            "imgstyle[i].style.width='\(SCREEN_WIDTH)'+'px';" +
		            "imgstyle[i].style.height = 'auto';" + "}"
	let sc = WKUserScript.init(source: js, injectionTime: .atDocumentEnd, forMainFrameOnly: true)
   	let user = WKUserContentController()
    user.addUserScript(sc)
    let config = WKWebViewConfiguration()
    config.userContentController = user

2.直接替换(简单粗暴)

	let result = "<img style='display: block; max-width: 100%;'"
    var contentStr = "<img src=\"https://gdp.alicdn.com/imgextra/i4/693060164/TB2YMPeaBLzQeBjSZFjXXcscpXa_!!693060164.jpg\" />"
    contentStr = contentStr.replacingOccurrences(of: "<img", with: result)

3.以上两种方法对我都不适用(不是图片问题)

由于webView内容未做适配，使用屏幕宽度作为宽度时，对应的高度应该按比例进行适配

func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
        weak var weakself = self
        var webWidth: CGFloat = 0
        var webHeight: CGFloat = 0
        webView.evaluateJavaScript("document.body.scrollHeight;") { (result, error) in
            let height = CGFloat(((result as AnyObject).doubleValue)!)
            webHeight = height
            if webWidth > 0 && webHeight > 0 {
                let realHeight = SCREEN_WIDTH * webHeight / webWidth
                webView.frame = CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: realHeight)
            }
        }
        
        webView.evaluateJavaScript("document.body.scrollWidth;") { (result, error) in
            let width = CGFloat(((result as AnyObject).doubleValue)!)
            webWidth = width
            if webWidth > 0 && webHeight > 0 {
                let realHeight = SCREEN_WIDTH * webHeight / webWidth
                webView.frame = CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: realHeight)
            }
        }
    }