错误:`在使用Firestore之前先调用FirebaseApp.configure() [英] Error: `call FirebaseApp.configure() before using Firestore`

问题描述

背景信息

我已经开始为一个简单的App开发后端，并且已经建立了一个数据库类(名为 DBDelegate )，所有文件都将与之通信.在我的 AppDelegate.swift 中，我有以下内容:

 静态公共变量dbDelegate:DBDelegate = DBDelegate()私人功能应用程序(_应用程序:UIApplication，didFinishLaunchingWithOptions launchOptions:[UIApplication.LaunchOptionsKey:任何]?)->布尔{//应用程序启动后进行自定义的替代点.FirebaseApp.configure()返回真} 

它是一个静态公共，因此我可以从其他文件访问 dbDelegate .

在其他文件中，我有以下几点可提高可读性:(因为它是一个类，因此将通过引用传递)

 让dbDelegate = AppDelegate.dbDelegate 

在我的 DBDelegate 类中:

  var db = Firestore.firestore()在里面() {FirebaseApp.configure()} 

构建和运行

构建代码时，它会正常运行.

在运行时，该应用会立即使用 SIGABRT 崩溃.错误消息是:
由于未捕获的异常"FIRAppNotConfiguredException"而终止应用程序，原因:无法获取FirebaseApp实例.在使用Firestore之前，请先致电FirebaseApp.configure().

我尝试过的

• 我尝试在 DBDelegate 类的init函数上设置一个断点.它没有达到断点.
• 我尝试使所有 dbDelegate 变量 lazy :
  • 我在AppDelegate中遇到了一个编译错误: lazy不能在已经很懒的全局对象上使用
  • 其他人的运行时错误:在使用Firestore之前，请先调用FirebaseApp.configure().
• 我尝试了以下操作(在didFinishLaunchingWithOptions中分配dbDelegate):

静态公共变量dbDelegate:DBDelegate！私人功能应用程序(_应用程序:UIApplication，didFinishLaunchingWithOptions launchOptions [UIApplication.LaunchOptionsKey:任何]?)->布尔{//应用程序启动后进行自定义的替代点.FirebaseApp.configure()dbDelegate = DBDelegate()返回真}

• 我收到编译错误:静态成员'dbDelegate'不能用于类型为'AppDelegate'的实例

任何帮助都会很棒！

我找到了一个麻烦的解决方案，请参见下文.

解决方案

首先，我要感谢@DionzB建议使用单例(我这样做了).我将在此答案中引用他/她的帖子.

好吧，所以经过一些研究并使用了断点，我发现我的自定义类实际上在AppDelegate之前执行.知道这一点后，我在以下行之前创建了一个变量:

  static let shared = FirebaseService() 

名称无关紧要，因为我/您不会调用它，并将其分配给 FirebaseApp.configure()

FirebaseService类变为:

  Class FirebaseService:NSObject {让constantToNeverTouch = FirebaseApp.configure()静态让共享= FirebaseService()在里面() {}} 

接下来，您必须确保FirebaseApp.configure()在代码中的其他位置都不存在.它也不应该在AppDelegate中.拥有多个FirebaseApp.configure()会使应用程序崩溃.

Background Info

I have started developing a backend for an simple App, and I have set up a database class (named DBDelegate) that all the files will communicate with. In my AppDelegate.swift I have this:

static public var dbDelegate:DBDelegate = DBDelegate()

private func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    // Override point for customization after application launch.
    FirebaseApp.configure()
    return true
}

Its a static public so I can access the dbDelegate from other files.

In my other files, I have the following to help readability: (because it is a class it will pass by reference)

let dbDelegate = AppDelegate.dbDelegate

In my DBDelegate class:

var db = Firestore.firestore()
init() {
    FirebaseApp.configure()
}

Building and Running

When I build my code, it builds fine.

On run, the app promptly crashes with SIGABRT. The error message is:
Terminating app due to uncaught exception 'FIRAppNotConfiguredException', reason: 'Failed to get FirebaseApp instance. Please call FirebaseApp.configure() before using Firestore'

What I have tried

• I have tried putting a breakpoint on the init function in the DBDelegate class. It does not reach the breakpoint.
• I have tried making the all the dbDelegate variables lazy:
  • I got a compile error for the one in AppDelegate: lazy must not be used on an already-lazy global
  • Runtime errors for others: please call FirebaseApp.configure() before using Firestore.
• I have tried the following (assigning dbDelegate in didFinishLaunchingWithOptions):

    static public var dbDelegate:DBDelegate!
    private func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        FirebaseApp.configure()
        dbDelegate = DBDelegate()
        return true
    }

• I get Compile error: Static member 'dbDelegate' cannot be used on instance of type 'AppDelegate'

Any help would be great!

Edit: I found a janky solution, see below.

解决方案

Firstly, I would like to thank @DionzB for suggesting using singletons (which I did). I will reference his/her post in this answer.

Ok, so after some research and playing with breakpoints, I found that my custom class actually executes before the AppDelegate. Knowing such, I created a variable before the following line:

static let shared = FirebaseService()

the name does not matter, because I/you will not call it, and assign it to FirebaseApp.configure()

The FirebaseService class becomes:

class FirebaseService: NSObject {
    let constantToNeverTouch = FirebaseApp.configure()
    static let shared = FirebaseService()

    init() {
    }
}

Next, you must make sure that FirebaseApp.configure() is no where else in your code. It should not be in the AppDelegate either. Having multiple FirebaseApp.configure()'s crashes the app.

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