iOS10 WKWebview-EvaluationJavaScript("document.height")返回nil [英] iOS10 WKWebview - evaluateJavaScript("document.height") return nil

问题描述

在我的应用中，我需要在 WKWebView 中获取网页的高度.所以我使用下面的代码.

In my app, I need to get the height of a webpage in a WKWebView. So I use the code below.

webView.evaluateJavaScript(("document.height"), completionHandler: { contentHeight,error in
    print(contentHeight)
})

在iOS 9之前，这将正确返回网页高度.但是在iOS 10中， contentHeight 始终为 nil .

Until iOS 9, this returns the webpage height correctly. But in iOS 10, contentHeight is always nil.

我已经设置

webView.scrollView.scrollEnabled = false

，Web视图位于 UITableViewCell 中.

webView 和 UITableViewCell 的高度是可变的.网络视图上有一个顶部和底部约束，以适合该单元格.

The height of webView and of the UITableViewCell are variable. There's a top and bottom constraint on the web view to fit to the cell.

当我获得网页高度时，我希望它能反映在单元格的高度中.

When I get the webpage height, I want it to be reflected in the cell's height.

推荐答案

尝试一下:

let javascriptString = "" +
            "var body = document.body;" +
            "var html = document.documentElement;" +
            "Math.max(" +
            "   body.scrollHeight," +
            "   body.offsetHeight," +
            "   html.clientHeight," +
            "   html.offsetHeight" +
        ");"

    webView.evaluateJavaScript(javascriptString) { (result, error) in
        if error == nil {
            if let result = result, let height = JSON(result).int {
                self.htmlContentHeight = CGFloat(height)
                self.resetContentCell()
            }
        }
    }

PS.WKWebiew渲染问题: WKWebView在iOS 10中无法正确呈现

PS. WKWebiew rendering problem: WKWebView not rendering correctly in iOS 10

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