Ashish Kakkad

Firebase Remote Config is used to change the application behavior without publishing update of application.

Add core firebase to your project

Follow the steps available at : Add Firebase to your iOS Project

Steps to add remote config to your app

1. Installation
   Update your project with required cocoapods
   
   Swift

   # Uncomment the next line to define a global platform for your project platform :ios, '9.0' target 'FireSwiftRemoteConfig' do # Comment the next line if you're not using Swift and don't want to use dynamic frameworks use_frameworks! # Pods for FireSwiftRemoteConfig pod 'Firebase/Core' pod 'Firebase/RemoteConfig' end

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   # Uncomment the next line to define a global platform for your project platform :ios, '9.0' target 'FireSwiftRemoteConfig' do   # Comment the next line if you're not using Swift and don't want to use dynamic frameworks   use_frameworks!   # Pods for FireSwiftRemoteConfig     pod 'Firebase/Core'     pod 'Firebase/RemoteConfig' end

   
   Run pod install from terminal and open the created .xcworkspace file.
2. Configure Firebase Module
   Just import firebase module and apply configure method. It will configure by itself by using GoogleService-Info.plist.
   
   Swift

   import UIKit import Firebase @UIApplicationMain class AppDelegate: UIResponder, UIApplicationDelegate { var window: UIWindow? func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool { // Firebase Configuration FIRApp.configure() return true } }

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   import UIKit import Firebase @UIApplicationMain class AppDelegate: UIResponder, UIApplicationDelegate {     var window: UIWindow?     func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {         // Firebase Configuration         FIRApp.configure()         return true     } }

3. Configure remote config
   Create Remote Config object, as shown in the following example:
   
   Swift

   var remoteConfig: FIRRemoteConfig! override func viewDidLoad() { super.viewDidLoad() remoteConfig = FIRRemoteConfig.remoteConfig() }

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   var remoteConfig: FIRRemoteConfig! override func viewDidLoad() {     super.viewDidLoad()     remoteConfig = FIRRemoteConfig.remoteConfig() }

   
   Create an plist file for default values of configuration and set it to remote config:
   
   Swift

   let remoteConfigSettings = FIRRemoteConfigSettings(developerModeEnabled: true) remoteConfig.configSettings = remoteConfigSettings! remoteConfig.setDefaultsFromPlistFileName("FireSwiftRemoteConfigDefaults")

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   let remoteConfigSettings = FIRRemoteConfigSettings(developerModeEnabled: true) remoteConfig.configSettings = remoteConfigSettings! remoteConfig.setDefaultsFromPlistFileName("FireSwiftRemoteConfigDefaults")

   
   FireSwiftRemoteConfigDefaults.plist with sampleURL key:
   
   XHTML

   <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict> <key>sampleURL</key> <string>http://google.com</string> </dict> </plist>

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   <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict> <key>sampleURL</key> <string>http://google.com</string> </dict> </plist>

   
   Use current default key from your defaults set on plist file and send fetch request in remote config to get the configuration keys set on the firebase console:
   
   Swift

   func fetchConfiguration() { lblResult.text = remoteConfig[sampleURLConfigKey].stringValue var expirationDuration = 3600 if remoteConfig.configSettings.isDeveloperModeEnabled { expirationDuration = 0 } remoteConfig.fetch(withExpirationDuration: TimeInterval(expirationDuration)) { (status, error) -> Void in if status == .success { print("Config fetched!") self.remoteConfig.activateFetched() } else { print("Config not fetched") print("Error \(error!.localizedDescription)") } lblResult.text = remoteConfig[sampleURLConfigKey].stringValue } }

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   func fetchConfiguration() {     lblResult.text = remoteConfig[sampleURLConfigKey].stringValue     var expirationDuration = 3600     if remoteConfig.configSettings.isDeveloperModeEnabled {         expirationDuration = 0     }     remoteConfig.fetch(withExpirationDuration: TimeInterval(expirationDuration)) { (status, error) -> Void in         if status == .success {             print("Config fetched!")             self.remoteConfig.activateFetched()         } else {             print("Config not fetched")             print("Error \(error!.localizedDescription)")         }         lblResult.text = remoteConfig[sampleURLConfigKey].stringValue     } }

   
   Note : If in developer mode cacheExpiration is set to 0 so each fetch will retrieve values from the server. The default expiration duration is 43200 (12 hours).

All Done.
Sample code available at Github. There are many other things with firebase, I will try give update in next tutorials.

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Happy Coding 🙂