Swift 3 iMessage 扩展无法打开 URL

我正在创建一个 iOS 应用程序 iMessage 扩展。

根据苹果的例子 https://developer.apple.com/library/prerelease/content/samplecode/IceCreamBuilder/Introduction/Intro.html，我根据提供的逻辑创建一条消息

guard let url: URL = URL(string: "http://www.google.com") else { return }

let message = composeMessage(url: url)
activeConversation?.insert(message, completionHandler: { [weak self] (error: Error?) in
    guard let error = error else { return }
    self?.presentAlert(error: error)        
})

also

private func composeMessage(url: URL) -> MSMessage {
    let layout = MSMessageTemplateLayout()
    layout.caption = "caption"
    layout.subcaption = "subcaption"
    layout.trailingSubcaption = "trailing subcaption"

    let message = MSMessage()
    message.url = url
    message.layout = layout

    return message
}

and

private func presentAlert(error: Error) {
    let alertController: UIAlertController = UIAlertController(
        title: "Error",
        message: error.localizedDescription,
        preferredStyle: .alert
    )

    let cancelAction: UIAlertAction = UIAlertAction(
        title: "OK",
        style: .cancel,
        handler: nil
    )

    alertController.addAction(cancelAction)

    present(
        alertController,
        animated: true,
        completion: nil
    )
}

据我了解，发送消息后，单击一下，应该打开 Safari 浏览器。

当我点击已发送的消息时，MessageViewControllerscreen 发生在整个屏幕上，无需打开 safari 或其他应用程序。

哪里有问题？我怎样才能实现想要的功能？

以下是我用来从 iMessage 扩展程序打开 URL 的代码。目前正在努力在 WATUU iMessage 应用程序中打开音乐应用程序。例如使用 URL ”"

此功能目前适用于 iOS 10、11 和 12

func openInMessagingURL(urlString: String){
    if let url = NSURL(string:urlString){
        let context = NSExtensionContext()
        context.open(url, completionHandler: nil)
        var responder = self as UIResponder?

        while (responder != nil){
            if responder?.responds(to: Selector("openURL:")) == true{
                responder?.perform(Selector("openURL:"), with: url)
            }
            responder = responder!.next
        }
    }
}

Swift 4 更新

func openInMessagingURL(urlString: String){
    if let url = URL(string:urlString){
        let context = NSExtensionContext()
        context.open(url, completionHandler: nil)
        var responder = self as UIResponder?

        while (responder != nil){
            if responder?.responds(to: #selector(UIApplication.open(_:options:completionHandler:))) == true{
                responder?.perform(#selector(UIApplication.open(_:options:completionHandler:)), with: url)
            }
            responder = responder!.next
        }
    }
}