react-native-firebase/docs/app/ios.md

title, description

title	description
iOS Initialization	Initialization Firebase with iOS.

iOS Manual Linking

The following steps are only required if your environment does not have access to React Native auto-linking.

Add on Podfile.lock

ios/Podfile

We recommend using a minimum platform version of at least 9.0 for your application to ensure that the correct version of the Firebase libraries are used, so make sure platform :ios, '9.0 is present at the top of your file. Also add RNFBApp pods inside your target.

platform :ios, '9.0'
//...

target 'yourApp' do
    //...
    pod 'RNFBApp', :path => '../node_modules/@react-native-firebase/app' 
end

Run pod install

You need to use the ios/[YOUR APP NAME].xcworkspace instead of the ios/[YOUR APP NAME].xcproj file from now on.

Add App to AppDelegate.m

ios/{yourApp}/AppDelegate.m

A) At the top of the file:

#import <Firebase.h>

B) At the beginning of the didFinishLaunchingWithOptions:(NSDictionary *)launchOptions method add the following line:

[FIRApp configure];