Method scene(_ scene: UIScene, continue userActivity: NSUserActivity) doesn't get called when the app is launched after the user clicks on a universal link.
It works fine when already launched app opens again after the user clicks on the universal link. The sample code:
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)")
}
I tried to use application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration, but it never gets called when the user clicks on the link:
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)
}
I tried to use 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)
}
}
I also tried the following methods:
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)
}
}
But scene.userActivity is always nil there and I can't get userActivity.webpageURL.
How can we recognize that the link was clicked and the app was launched (not just opened)?
You almost had it:
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
if let userActivity = scene.userActivity { // <-- not quite
self.scene(scene, continue: userActivity)
}
}
It's not in the scene; it's in the options. Look in the options.userActivities. (Though if what has happened is that the user clicked a link to launch us, I would expect to find the URL in the options.urlContexts.)
Apple responded confirming that issue in iOS 13.
来源：https://stackoverflow.com/questions/58243884/scene-scene-uiscene-continue-useractivity-nsuseractivity-doesnt-get-cal