wkWebView 精準(zhǔn)計算內(nèi)部高度

extension BusShopMallDetailsViewController{

func loadWebData() {
    wkWebView.isUserInteractionEnabled = false
    wkWebView.scrollView.addObserver(self, forKeyPath: "contentSize", options: .new,context:nil)

    guard (productDetailsStr ?? "") != "" else {
        return
    }
    
    let str = "<html> \n"
    +  "<head> \n"
    +  "<style type=\"text/css\"> \n"
    +  "body {font-size:15px;}\n"
    +  "</style> \n"
    +  "</head> \n"
    +  "<body>"
    +  "<script type='text/javascript'>"
    +  "window.onload = function(){\n"
    +  "var $img = document.getElementsByTagName('img');\n"
    +  "for(var p in  $img){\n"
    + " $img[p].style.width = '100%';\n"
    + "$img[p].style.height ='auto'\n"
    + "}\n"
    +  "}"
    +  "</script><div style=\"font-size:36px\">\(productDetailsStr)</div>"
                                + "</body>"
                                + "</html>"
    
    wkWebView.loadHTMLString(str, baseURL: nil)
    wkWebView.sizeToFit()
}

override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
    
        
        if keyPath == "contentSize" {
            
            if self.wkWebView.estimatedProgress == 1.0 && self.wkWebView.isLoading == false  {//判斷WebView加載完成
                
                wkWebView.evaluateJavaScript("document.readyState") { [weak self] (readyState, readyStateError) in
                    guard let self = self else {return}
                    
                    if let readyState = readyState as? String {
                        
                        if readyState == "complete"{//加載完成了
                            
                            self.wkWebView.evaluateJavaScript("document.body.scrollWidth",completionHandler: { [weak self](data, error ) in
                                guard let self = self else {return}
                                if let data = data as? CGFloat, data > 0 {
                                    //計算縮放比
                                    let ratio = self.wkWebView.frame.width / data
                                    //offsetHeight:獲取對象相對于版面或由父坐標(biāo) offsetParent 屬性指定的父坐標(biāo)的高度
                                    self.wkWebView.evaluateJavaScript("document.body.offsetHeight",completionHandler: { [weak self](data, error ) in
                                        guard let self = self else {return}
                                        
                                        var height:CGFloat = data as? CGFloat ?? 0.0
                                        height = height * ratio
                                        print("#####高度：%@",height)
                                        
                                        if self.webH != height {
                                            self.webH = height
                                            self.tableView.reloadRows(at: [IndexPath(row: 1, section: 0)], with: .none)
                                        }
                                    })
                                }
                            })
                        }
                    }
                }
            }
      }
}

}
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