ios - 如何处理从另一个应用程序共享到我自己的 iOS 应用程序的文件？

Question

我按照上一个问题 ( Swift , Xcode, iOS - How to handle a file sent with 'Open in...' from another app to my own app ) 将函数集成到我的应用中的 Open in... 中。例如，我想使用 Files 应用程序选择一个文档文件(例如 PDF)并在我自己的应用程序中打开。

但是，AppDelegate 中的以下代码不会被调用。我想知道这是否是因为 Swift 的版本差异？ Apple 是否更改了 iOS 15 或更早版本的源代码来执行此操作？如果我能听到如何在 Swift 5、iOS 15 中实现这一点，我将不胜感激。

func application(_ app: UIApplication,
                     open url: URL,
                          options: [UIApplication.OpenURLOptionsKey : Any] = [:]) -> Bool{
    do {
        let data = try Data(contentsOf: url)
        // Do something with the file
        print ("File was shared!")
        print (data)
       
        
    } catch {
        print("Unable to load data: \(error)")
    }

    return true
}

我已经以其他应用可以尝试共享文件的方式设置了该应用。当尝试在我的应用程序中打开时，我的应用程序打开了，但上面的代码似乎没有被调用。

Answer 1

看来您遵循了 this previous question 中的方法仅部分。在这种情况下，此人已成功实现了自定义 URL 方案解决方案的 3 个部分中的 2 个，因此答案仅提供了第 3 部分。

如https://developer.apple.com/documentation/xcode/defining-a-custom-url-scheme-for-your-app说:

To support a custom URL scheme:

1. Define the format for your app’s URLs.
2. Register your scheme so that the system directs appropriate URLs to your app.
3. Handle the URLs that your app receives.

他们的问题是:

My app is being displayed in the available applications to which I can send the file to. My question is what happens after? When I choose to send it to my app it then switches over to my app and from there, I don't know how to receive the file and read it to extract its content.

所以他们已经完成了步骤 1 和 2(因此，他们的应用程序在可用应用程序中正确显示，等等)。

就您而言，听起来您还没有完成第 1 步和第 2 步？

另一种可能性是(同样来自 https://developer.apple.com/documentation/xcode/defining-a-custom-url-scheme-for-your-app )如果您正在使用场景，请注意您的应用程序还有其他入口点。

If your app has opted into Scenes, and your app is not running, the system delivers the URL to the scene(:willConnectTo:options:) delegate method after launch, and to scene(:openURLContexts:) when your app opens a URL while running or suspended in memory.

类似于

func scene(_ scene: UIScene, 
       willConnectTo session: UISceneSession, 
       options connectionOptions: UIScene.ConnectionOptions) {

// Determine who sent the URL.
if let urlContext = connectionOptions.urlContexts.first {

    let sendingAppID = urlContext.options.sourceApplication
    let url = urlContext.url
    print("source application = \(sendingAppID ?? "Unknown")")
    print("url = \(url)")

    // Process the URL similarly to the UIApplicationDelegate example.
}

/*
 *
 */
}

正如苹果文档所说，对于应用程序在后台的情况，然后实现类似的东西

func scene(_ scene: UIScene, openURLContexts URLContexts: Set<UIOpenURLContext>){
        let url = URLContexts.first?.url
        print("url = \(url)")

    // Process the URL similarly to the UIApplicationDelegate example.
}