WKWebView 旋转 phone iOS9 后得到旧值 Scroll Height

WKWebView get the old value Scroll Height after rotate the phone iOS9

我有一个单元格内的 WKWebView,但问题是当旋转 phone 时,我得到了 WkWebView 滚动高度的旧值,因此内容无法完全加载。

 override func viewWillTransitionToSize(size: CGSize, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator) {
    self.contentHeights[3] = self.webView.scrollView.contentSize.height
}

此方法更改 table 单元格的行高,但我得到的值是在旋转之前。

 func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat
{
    if indexPath.row == 3{
        return contentHeights[indexPath.row]
    }else{
        contentHeights[indexPath.row] = UITableViewAutomaticDimension
        return contentHeights[indexPath.row]
    }


}
func tableView(tableView: UITableView, estimatedHeightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
    if indexPath.row == 3{
        return contentHeights[indexPath.row]
    }else{
        return UITableViewAutomaticDimension
    }
}

第 3 行是 WkWebView 有帮助吗???

我看了好几本post,然后我找到了解决问题的两种方法。

首先我用的是KVO

addObserver(self, forKeyPath: "webView.scrollView.contentSize", options: .New, context: nil)

override func observeValueForKeyPath(keyPath: String, ofObject object: AnyObject, change: [NSObject : AnyObject], context: UnsafeMutablePointer<Void>) {
if keyPath == "webView.scrollView.contentSize" {
    if let nsSize = change[NSKeyValueChangeNewKey] as? NSValue {
        let height = nsSize.CGSizeValue().height
        // Do something here using content height.
    }
}}

removeObserver(self, forKeyPath: "webView.scrollView.contentSize", context: nil)

第二种方式是Javascript上的事件:

将以下代码添加到 html 代码中:

<script>$(document).ready(function(){$( document ).resize(function() {webkit.messageHandlers.callbackHandler.postMessage($( document ).height())});});</script>

添加WkWebView如下配置:

var contentController:WKUserContentController!
override func loadView() {
    super.loadView()
    contentController = WKUserContentController()
    contentController.addScriptMessageHandler(
        self,
        name: "callbackHandler"
    )

    config = WKWebViewConfiguration()
    config.userContentController = contentController
    self.webView = WKWebView(frame: CGRectMake(0, 0, self.view.frame.width, self.view.frame.height), configuration: config)
}

添加以下函数:

func userContentController(userContentController: WKUserContentController, didReceiveScriptMessage message: WKScriptMessage) {  
    if(message.name == "callbackHandler") {
        if !positionOrientationLanscape{
            sizeLanscape = CGFloat((message.body as! NSNumber).doubleValue)
            contentHeights[4] = sizeLanscape
        }else{
            sizePortrait = CGFloat((message.body as! NSNumber).doubleValue)
            contentHeights[4] = sizePortrait
        }
    }    
}

别忘了deinit

deinit {   

        self.contentController.removeScriptMessageHandlerForName("callbackHandler")
    }