How to Implement Firebase Remote Config with Swift 5: A Step-by-Step Guide

How to Implement Firebase Remote Config with Swift 5

As a developer, you may have come across the need to update the behavior or appearance of your iOS app without having to submit a new version to the App Store. This is where Firebase Remote Config comes in handy. With Firebase Remote Config, you can dynamically change the behavior and appearance of your app by modifying values in the cloud, without requiring your users to download an app update.

Getting Started with Firebase Remote Config

Before we dive into implementing Firebase Remote Config in Swift 5, let’s make sure we have the necessary setup in place:

Step 1: Set up Firebase Project

The first step is to set up a Firebase project. If you haven’t done this already, head over to the Firebase Console ( and create a new project. Once your project is created, you’ll be able to access your project’s settings and configuration details.

Step 2: Install Firebase SDK

In order to use Firebase Remote Config in your app, you’ll need to install the Firebase SDK. The easiest way to do this is by using CocoaPods. Open your Terminal, navigate to your project directory, and run the following command:

pod init

This will create a Podfile in your project directory. Open the Podfile using a text editor and add the following line to it:

pod 'Firebase/RemoteConfig'

Save the Podfile and run the following command in your Terminal:

pod install

Step 3: Configure Firebase Remote Config

Now that you have installed the Firebase SDK, the next step is to configure Firebase Remote Config in your app. Open your Xcode project and locate the AppDelegate.swift file. Add the following code to the didFinishLaunchingWithOptions method:

import Firebase

// ...

Func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    // Configure Firebase
    // Further app configuration...
    return true

This code will initialize Firebase in your app and configure it with the settings from the GoogleService-Info.plist file.

Updating Remote Config Values

Now that we have Firebase Remote Config set up in our app, let’s see how we can update the remote config values from the Firebase Console.

Step 1: Add Remote Config Parameters

To define the parameters and their default values in your app, open the RemoteConfig.Defaults.plist file and add the desired parameters. Make sure to provide a default value for each parameter.

Step 2: Fetch Remote Config Values

In order to fetch the remote config values from the Firebase servers, you’ll need to make a call to the fetch method. Add the following code to fetch the values in your app:

import FirebaseRemoteConfig

// ...

// Create remote config settings
let remoteConfigSettings = RemoteConfigSettings()
remoteConfigSettings.minimumFetchInterval = 0

// Get instance of the remote config object
let remoteConfig = RemoteConfig.remoteConfig()
remoteConfig.configSettings = remoteConfigSettings

// Fetch remote config values
remoteConfig.fetch(completionHandler: { (status, error) in
    if status == .success {
        remoteConfig.activate(completionHandler: nil)
        // Update UI with fetched values
    } else {
        print("Error fetching remote config: \(error?.localizedDescription ?? "")")

This code sets the minimum fetch interval to 0, which means that the remote config values will be fetched every time the fetch method is called. You can adjust the fetch interval according to your needs.

Step 3: Update UI with Remote Config Values

Once the remote config values are successfully fetched and activated, you can use them to update the UI of your app. Create a method called updateUIWithRemoteConfigValues and update your UI elements accordingly:

func updateUIWithRemoteConfigValues() {
    let backgroundColor = remoteConfig["background_color"].stringValue ?? "#FFFFFF"
    let buttonColor = remoteConfig["button_color"].stringValue ?? "#000000"
    // Update UI elements
    self.view.backgroundColor = UIColor(hexString: backgroundColor)
    self.myButton.backgroundColor = UIColor(hexString: buttonColor)

In this example, we assume that you have a view with a background color and a button with a background color. The remote config values for these UI elements are fetched and used to update them accordingly.

Advanced Usage and Best Practices

Now that you have a basic understanding of how to implement Firebase Remote Config in your iOS app using Swift 5, let’s take a look at some advanced usage and best practices.

Parameter Types

Remote Config supports several parameter types, such as string, number, boolean, and date. Make sure to choose the appropriate parameter type for each parameter in your app.

A/B Testing

Firebase Remote Config allows you to perform A/B testing by segmenting your users and providing different values for each segment. This can be useful to test out different features or UI changes with a subset of your users before rolling them out to everyone.

Conditional Values

You can specify conditions for your remote config values, such as targeting different values based on the user’s language or region. This can be helpful to provide localized content or region-specific configurations.

Remote Config and App Store Review Guidelines

Keep in mind that while Firebase Remote Config allows you to dynamically change the behavior and appearance of your app, you still need to comply with the App Store review guidelines. Make sure to carefully review and test your remote config changes to ensure they meet the guidelines and do not violate any Apple policies.


In this article, we learned how to implement Firebase Remote Config in Swift 5. We covered the initial setup steps, fetching remote config values, and updating the UI of your app based on those values. We also discussed some advanced usage and best practices for using Firebase Remote Config in your iOS app. Now you can dynamically update your app’s behavior and appearance without requiring your users to download an app update. Happy coding!

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