如何从iOS Swift中的Firebase远程配置中获取整数值?

问题描述：

所以我在iOS中将Firebase远程配置设置为默认值，

so I set Firebase remote config default in my iOS like this:

let remoteConfig = RemoteConfig.remoteConfig()

// set remote config default value
let defaultRemoteConfig : [String:NSObject] = [
  "number_of_recommended_events_to_show_per_page" : 15 as NSObject
]

remoteConfig.setDefaults(defaultRemoteConfig)

 // Activate and refetch remote config data. 
 // I use 'Load Value for next time' loading strategy
 remoteConfig.activate()
 remoteConfig.fetch()

然后我想像这样从远程获取值

and then I want to get the value from remote like this

 // get the value from remote config
let numberOfDocumentsPerQuery = remoteConfig.configValue(forKey: "number_of_recommended_events_to_show_per_page").numberValue as! Int

我需要Integer格式的值，但是当我将其强制转换为 Int 时，它会崩溃

I need the value in Integer format, but it crash when I cast it to Int like that

这是我在控制台中设置值的方式

here is how I set the value in the console

为什么没有?如何解决这个问题?

why is it nil ? how to fix this ?

答

在获取远程值之前，请确保已在此块中进行了获取.

Make sure you've fetched in this block before getting a remote value.

func fetchCloudValues() {
  // WARNING: Don't actually do this in production!
  let fetchDuration: TimeInterval = 0

  RemoteConfig.remoteConfig().fetch(withExpirationDuration: fetchDuration) { [weak self] status, error in

    if let error = error {
      print ("Uh-oh. Got an error fetching remote values \(error)")
      return
    }

    RemoteConfig.remoteConfig().activateFetched()
    print ("Retrieved values from the cloud!")
    let numberOfEvents = RemoteConfig.remoteConfig()
                                            .configValue(forKey: "number_of_recommended_events_to_show_per_page")
                                            .intValue ?? 0
    print("Our app's number of events is \(numberOfEvents)")

  }
}

如何从iOS Swift中的Firebase远程配置中获取整数值?

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