在没有AppDelegate和SceneDelegate的新SwiftUI App生命周期中，哪里可以在我的iOS应用中配置Firebase?

问题描述：

我已经有了一个可以使用SwiftUI完全构建的应用程序. 我当时使用Firebase使用Cloud Functions进行身份验证和通知.

I have an app already that I was able to build completely with SwiftUI. I was using Firebase for authentication and notifications using Cloud Functions.

现在有了新的SwiftUI App-> Scene->视图构造，我无法将设置添加到我的应用中.

Now with the new SwiftUI App->Scene->View construct, I am unable to add the setup to my app.

例如->最初的FirebaseApp.configure()最初会放在AppDelegate的didFinishLaunchingWithOptions中，现在我不知道在何处添加此配置.

For example -> The initial FirebaseApp.configure() would initially go in didFinishLaunchingWithOptions in AppDelegate, now I am at a loss of where to add this configuration.

设置远程通知也是如此.

Same goes with setting up remote notifications.

PS:如果需要先前应用程序的更多详细信息/代码，请发表评论.我没有添加任何代码，因为我觉得这是不必要的.

PS: Please comment if more details/code of the previous app is required. I did not add any code, cause I felt it was unnecessary.

答

在新的SwiftUI生命周期中，可以使用三种方法来初始化第三方框架:

There are three approaches for initialising third part frameworks in the new SwiftUI life cycle:

您仍然可以使用旧的生命周期模型:

You can still use the old life cycle model:

在创建新的SwiftUI项目时，您可以选择旧的生命周期模型.像以前一样，这将创建一个AppDelegate和SceneDelegate.我承认，不像一直使用SwiftUI那样花哨-但这绝对是最简单，最直接的方法.

When creating a new SwiftUI project, you can choose the old life cycle model. This will create an AppDelegate and a SceneDelegate as before. Not as fancy as using SwiftUI all the way, I admit - but definitely the easiest and most straightforward way.

如果要使用新的生命周期模型，请使用以下方法之一.

If you want to use the new life cycle model, use either one of the following approaches.

您可以覆盖App类的默认初始化程序，如下所示:

You can override the default initialiser of your App class, like this:

import SwiftUI
import Firebase

@main
struct SO62626652_InitialiserApp: App {
  
  init() {
    FirebaseApp.configure()
  }
  
  var body: some Scene {
    WindowGroup {
      ContentView()
    }
  }
}

选项3:使用`@ UIApplicationDelegateAdaptor`

在您的App类中，定义一个保存对AppDelegate的引用的属性，然后让SwiftUI使用@ UIApplicationDelegateAdaptor属性包装器注入AppDelegate，如下所示:

Option 3: Use `@ UIApplicationDelegateAdaptor`

In you App class, define a property that holds a reference to your AppDelegate, and let SwiftUI inject the AppDelegate using the @ UIApplicationDelegateAdaptor property wrapper, like this:

import SwiftUI
import Firebase

@main
struct SO62626652_AppDelegateAdaptorApp: App {
  @UIApplicationDelegateAdaptor private var appDelegate: AppDelegate
  var body: some Scene {
    WindowGroup {
      ContentView()
    }
  }
}

class AppDelegate: NSObject, UIApplicationDelegate {
  func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
    FirebaseApp.configure()
    return true
  }
}

在没有AppDelegate和SceneDelegate的新SwiftUI App生命周期中，哪里可以在我的iOS应用中配置Firebase?

选项3:使用@ UIApplicationDelegateAdaptor

Option 3: Use @ UIApplicationDelegateAdaptor

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选项3:使用`@ UIApplicationDelegateAdaptor`

Option 3: Use `@ UIApplicationDelegateAdaptor`