如何使用Swift将鼠标悬停在URL上WkWebView [英] how to get mouse over URLs into WkWebView with Swift

问题描述

作为如何从Objective-C的WKWebView中获取所选文本，我有一个相关的问题，但使用的是Swift。

As a follow-up to How do I get the selected text from a WKWebView from objective-C, I have a related question but using Swift.

我需要获取将鼠标悬停在URL上，以显示上下文菜单外观，因此我可以将其注入菜单项的respresentedObject-或保存。某些项目的内置操作未正确处理。

I need to obtain the URL on mouse over, in prelude to contextual menu appearance, so I can inject it into the menu item's respresentedObject - or otherwise save. The built-in action(s) for some items are not being properly handled.

我发现打开链接的菜单项操作正常，但对于新窗口中的打开链接却不起作用；这些都不能通过内置的上下文菜单项操作来工作。我希望支持单击中间按钮成为后一个菜单项。

I find that menu item action for 'Open Link' works fine but not for 'Open Link in New Window'; neither of these work via the built-in contextual menu item actions. I wanted to support a middle button click to be the latter menu item.

因此，以原始帖子为基础，我有这个功能-我也将WkWebView子类化，添加

So, using the original post as a base I have this - I also sub-class WkWebView, adding

class MyWebView : WKWebView {
    var selectedText : String?
    var selectedURL : URL?
}

然后在视图控制器中

func viewDidLoad() {
    //  Watch javascript selection messages
    let controller = webView.configuration.userContentController
    controller.add(self, name: "newSelectionDetected")
    let js = """
function getSelectionAndSendMessage()
{
    var txt = document.getSelection().toString() ;
    window.webkit.messageHandlers.newSelectionDetected.postMessage(txt) ;
}
document.onmouseup   = getSelectionAndSendMessage ;
document.onkeyup     = getSelectionAndSendMessage ;
"""

    let script = WKUserScript.init(source: js, injectionTime: .atDocumentEnd, forMainFrameOnly: true)
    controller.addUserScript(script)
}

// MARK: Javascript

func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {
    Swift.print("userContentController")

    // A new selected text has been received
    if let urlString : String = message.body as? String
    {
        webView.selectedText = urlString
        Swift.print("ucc: str -> \(urlString)")
    }
    if let url = message.frameInfo.request.url {
        webView.selectedURL = url
        Swift.print("ucc: url -> \(url.absoluteString)")
    }
}

// MARK: callbacks
override func willOpenMenu(_ menu: NSMenu, with event: NSEvent) {

    //  Pick off javascript items we want to ignore or handle
    for title in ["Open Link", "Open Link in New Window", "Download Linked File"] {
        if let item = menu.item(withTitle: title) {
            if title == "Download Linked File" {
                menu.removeItem(item)
            }
            else
            if title == "Open Link"
            {
                item.representedObject = self.window
                item.action = #selector(MyWebView.openLinkInWindow(_:))
                item.target = self
            }
            else
            {
                item.action = #selector(MyWebView.openLinkNewWindow(_:))
                item.target = self
            }
        }
    }
}

在我的动作处理程序中， m仅获取框架的URL，而不是鼠标悬停时突出显示的内容。

In my action handler, I'm only getting the frame's URL, not what was highlighted on mouse over.

我需要的是获取鼠标悬停时Web浏览器状态栏中显示的URL等，以缓存上下文菜单项的操作。

What I need, is to get the URL etc as shown in a web browser's status bar on mouse overs to be cached for a contextual menu item's action.

推荐答案

好吧，我想在您的JavaScript中，您需要向所有链接添加onmouseover事件处理程序，并且该事件处理程序应发送

Well, I guess that, in your javascript, you need to add a onmouseover event handler to all your links, and this event handler should send the link back to the swift world.

在您的代码的基础上，我将在Javascript中添加以下内容：

Building upon your code, I would add in the Javascript something like:

function sendLink()
{
    window.webkit.messageHandlers.newUrlDetected.postMessage(this.href) ;
}

var allLinks = document.links;
for(var i=0; i< allLinks.length; i++)
{
    allLinks[i].onmouseover = sendLink ;
}

当然，在Swift世界中，您需要捕获 newUrlDetected

And of course, in the Swift world, you need to catch the "newUrlDetected"

controller.add(self, name: "newUrlDetected")

在Swift消息处理程序中，您需要打开WKScriptMessage名称属性。

And in the Swift message handler, you need to switch upon the WKScriptMessage name property.

• 如果它是 newSelectionDetected，则将webView.selectedText设置为邮件正文


• 如果它是 newUrlDetected，则将webView.selectedURL设置为邮件正文
  

这篇关于如何使用Swift将鼠标悬停在URL上WkWebView的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！