application(_:url:options:) is never called

问题

Steps to reproduce:

1. Create a new project with default settings in Xcode 11: Single View App / Swift / Storyboards.
2. Add your Document Types and Imported UTIs.

Result: My application appears in “Copy to...” menu (or “Open in...” if we use LSSupportsOpeningDocumentsInPlace). It really launches the app. But this delegate method: application(_:url:options:) is never called.

回答1:

In iOS 13 this method was replaced with a new UISceneDelegate method by default.

Solution:

If you don't need scenes, just remove all scene-related code: SceneDelegate etc., remove UIApplicationSceneManifest from Info.plist, and add var window: UIWindow? to your AppDelegate.

application(_:url:options:) is working now.

来源：https://stackoverflow.com/questions/58624477/application-urloptions-is-never-called