`scene(_scene: UIScene, continue userActivity: NSUserActivity)`在用戶點擊通用鏈接后啟動應用程序時不會被調用

Question

在用戶單擊通用鏈接后啟動應用程序時，不會調用方法scene(_ scene: UIScene, continue userActivity: NSUserActivity) 。

當用戶單擊通用鏈接后再次打開已啟動的應用程序時，它工作正常。 示例代碼：

func scene(_ scene: UIScene, continue userActivity: NSUserActivity) {
    guard userActivity.activityType == NSUserActivityTypeBrowsingWeb,
        let incomingURL = userActivity.webpageURL,
        let components = NSURLComponents(url: incomingURL, resolvingAgainstBaseURL: true),
        let path = components.path else {
            return
    }
    let params = components.queryItems ?? [URLQueryItem]()

    print("path = \(path)")
    print("params = \(params)")
}

我嘗試使用application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration ，但是當用戶單擊鏈接時它永遠不會被調用：

func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
    if let scene = connectingSceneSession.scene, let userActivity = scene.userActivity {
        if userActivity.activityType == NSUserActivityTypeBrowsingWeb {
            if let incomingURL = userActivity.webpageURL,
                let components = NSURLComponents(url: incomingURL, resolvingAgainstBaseURL: true),
                let path = components.path {
                let params = components.queryItems ?? [URLQueryItem]()

                print("path = \(path)")
                print("params = \(params)")
            }
        }
    }
    return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
}

我嘗試使用scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) ：

func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
    if let userActivity = scene.userActivity {
        self.scene(scene, continue: userActivity)
    }
}

我還嘗試了以下方法：

func sceneDidBecomeActive(_ scene: UIScene) {
    if let userActivity = scene.userActivity {
        self.scene(scene, continue: userActivity)
    }
}

func sceneWillEnterForeground(_ scene: UIScene) {
    if let userActivity = scene.userActivity {
        self.scene(scene, continue: userActivity)
    }
}

但是scene.userActivity總是為零，我無法獲得userActivity.webpageURL 。

我們如何識別鏈接被點擊並且應用程序被啟動（不僅僅是打開）？

Answer 1

你幾乎擁有它：

func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
    if let userActivity = scene.userActivity { // <-- not quite
        self.scene(scene, continue: userActivity)
    }
}

它不在場景中； 它在connectionOptions中。 查看connectionOptions.userActivities 。 （雖然如果發生的事情是用戶點擊了一個鏈接來啟動我們，我希望在connectionOptions.urlContexts中找到 URL 。）

Answer 2

Apple 在 iOS 13 中回復確認了該問題。

Answer 3

這對我有用：

func scene(_ scene: UIScene, willConnectTo _: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        for userActivity in connectionOptions.userActivities {
            if let url = userActivity.webpageURL { //ADD WHATEVER CONDITION YOU NEED
                //DO WHAT YOU NEED HERE
                break
            }
        }
    }

基本上問題是通用鏈接“隱藏”在connectionOptions中，因此您必須使用循環搜索它。

Answer 4

Matt 接受的答案適用於在尚未打開應用程序時啟動通用鏈接。

如果您還想在應用打開時處理通用鏈接，則需要以下兩個函數：

// SceneDelegate.swift
// This function is called when your app launches.
// Check to see if our app was launched with a universal link. 
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
   // See if our app is being launched via universal link.
   for userActivity in connectionOptions.userActivities {
     if let universalLink = userActivity.webpageURL {
         // Do whatever you want with the universal link here.
         // NOTE: if you're navigating a web view, know that the web view will not be initialized here yet. 
         // To navigate a web view, store the URL in a variable and navigate to it once the web view is initialized.
     }
  }
}

// SceneDelegate.swift
// This function is called when your app is already running and a universal link to your app is clicked.
func scene(_ scene: UIScene, continue userActivity: NSUserActivity) {
    // Ensure we're trying to launch a link.
    guard userActivity.activityType == NSUserActivityTypeBrowsingWeb,
        let universalLink = userActivity.webpageURL else {
        return
    }

    // Handle the universal link here.
    // If you're navigating a web view, here's how I do it:
    //MyApp.webView.evaluateJavaScript("location.href = '\(universalLink)'")
}

我已經驗證這適用於我的應用程序。 有關詳細信息，請參閱此 Github 線程。