Handle deep liking from multiple sources in a React Native app for iOS

AppDelegate.m

// 'The AppDelegate.m file can only have one method for openUrl.'
// 'If you're also using RCTLinkingManager to handle deep links, you should handle both results in your openUrl method.'
// https://github.com/facebook/react-native-fbsdk#32-ios-project

#import "AppDelegate.h"

#import <React/RCTBundleURLProvider.h>
#import <React/RCTRootView.h>
#import <CodePush/CodePush.h>
#import <react-native-branch/RNBranch.h>
#import <FBSDKCoreKit/FBSDKCoreKit.h>
#import <FBSDKLoginKit/FBSDKLoginKit.h> 
#import <RNGoogleSignin/RNGoogleSignin.h>

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
  // Initialize Branch SDK
  [RNBranch initSessionWithLaunchOptions:launchOptions isReferrable:YES];
  
  // Initialize FBSDK
  [[FBSDKApplicationDelegate sharedInstance] application:application 
    didFinishLaunchingWithOptions:launchOptions];

  // Declare the location of the js bundle for react-native (CodePush)
  NSURL *jsCodeLocation;

  #ifdef DEBUG
    jsCodeLocation = [[RCTBundleURLProvider sharedSettings] jsBundleURLForBundleRoot:@"index" fallbackResource:nil];
  #else
    jsCodeLocation = [CodePush bundleURL];
  #endif
   
  // set up the root view for react-native  
  RCTRootView *rootView = [[RCTRootView alloc] initWithBundleURL:jsCodeLocation moduleName:@"myapp" initialProperties:nil launchOptions:launchOptions];

  // Set the background color of the root view
  rootView.backgroundColor = [[UIColor alloc] initWithRed:0.09 green:0.09 blue:0.11 alpha:1];

  self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
  UIViewController *rootViewController = [UIViewController new];
  rootViewController.view = rootView;
  self.window.rootViewController = rootViewController;
  [self.window makeKeyAndVisible];
  return YES;
}

- (BOOL)application:(UIApplication *)application
        openURL:(NSURL *)url 
        sourceApplication:(NSString *)sourceApplication
        annotation:(id)annotation {
    
    // handle incoming links from Branch (deep-linking content)
    BOOL handledBranch = [RNBranch.branch 
        application:application
        openURL:url
        sourceApplication:sourceApplication
        annotation:annotation
    ];

    // handle incoming links from Facebook (sign-in)
    BOOL handledFB = [[FBSDKApplicationDelegate sharedInstance]
        application:application
        openURL:url 
        sourceApplication:sourceApplication 
        annotation:annotation
    ];

    // handle incoming links from Google (sign-in)
    BOOL handledGoog = [RNGoogleSignin 
        application:application
        openURL:url
        sourceApplication:sourceApplication
        annotation:annotation
    ];
    
    return handledBranch || handledFB || handledGoog;
}

// set up fb app events
- (void)applicationDidBecomeActive:(UIApplication *)application {
    [FBSDKAppEvents activateApp];
}

// Add the continueUserActivity function for hte Branch SDK
- (BOOL)application:(UIApplication *)application continueUserActivity:(NSUserActivity *)userActivity restorationHandler:(void (^)(NSArray *restorableObjects))restorationHandler {
    return [RNBranch continueUserActivity:userActivity];
}

@end