Firebase Remote Config iOS Setup Guide

Important references:

Refer to the firebase-basics skills, particularly those for iOS setup, before proceeding.
Refer to the xcode-project-setup skills.

Project and App Setup

Use the firebase-tools CLI to set up the project if necessary.

Find Bundle ID: Read the Xcode project to find the iOS bundle ID. Check the PRODUCT_BUNDLE_IDENTIFIER value in the .pbxproj file or the Info.plist file.
Create Firebase Project: If no project exists, create one: npx -y firebase-tools@latest projects:create <project-id> --display-name="My Awesome App"
Create Firebase App: Register the iOS app with the discovered bundle ID: npx -y firebase-tools@latest apps:create IOS <bundle-id>
Link the GoogleService-Info.plist file: Use the script in the xcode-project-setup skill to obtain the config and link.

Add Swift Package Dependencies

Install the Remote Config and Analytics SDKs using the Swift package manager.

Install the FirebaseRemoteConfig and FirebaseAnalytics packages from the https://github.com/firebase/firebase-ios-sdk.git repository.

Initialize Firebase in App Code

Modify the application's entry point to initialize Firebase. Refer to the iOS setup reference in the firebase-basics skill.

Follow up Steps

The following steps cover the essential patterns for using Remote Config effectively in your iOS app.

Set In-App Defaults

Define default values so your app behaves as intended before it connects to the backend. Create a property list file (e.g., RemoteConfigDefaults.plist):

```xml
<?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>welcome_message</key>
    <string>Welcome to the app!</string>
    <key>is_feature_enabled</key>
    <false/>
</dict>
</plist>
```

Then, initialize the SDK and set the defaults:

```swift
import FirebaseRemoteConfig

let remoteConfig = RemoteConfig.remoteConfig()
remoteConfig.setDefaults(fromPlist: "RemoteConfigDefaults")
```

Fetch and Activate Values

To retrieve values from the cloud and apply them to your app:

```swift
remoteConfig.fetchAndActivate { (status, error) in
    if status == .successFetchedFromRemote || status == .successUsingPreFetchedData {
        print("Config fetched and activated!")
    } else {
        print("Config not fetched")
    }
    
    // Access a value
    let message = remoteConfig.configValue(forKey: "welcome_message").stringValue
}
```

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