Creating GARSession fails first time, succeeds after delay, manual ARCore installation

[Nick Jensen]

Update: I can now create GARSessions, however it requires adding a delay. See second comment.

Hello, I'm attempting to add ARCore and ARCoreGeospatial to an iOS application and, because of reasons out of my control, I cannot use Cocoapods or SPM. Here is what I've tried so far:

I've created an empty project and added (and linked) the following xcframeworks:

Then I've added $(inherited) -ObjC options as other linker flags.

I've configured a new Firebase app and added the following to my app delegate:

import UIKit
import FirebaseCore
import ARCoreGARSession

@main
class AppDelegate: UIResponder, UIApplicationDelegate {

    var garSession: GARSession!

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        FirebaseApp.configure()
        garSession = try! GARSession(apiKey: "my-api-key", bundleIdentifier: nil)
        return true
    }
}

Everything compiles and installs fine, however the try ! line where I create the garSession raises an exception with error code -1 which from what I can see means my device is not supported, which is not the case for my iPhone 13 Pro.

'try!' expression unexpectedly raised an error: Error Domain=GARSession Code=-1 "(null)"

Additionally I've tested the exact same thing with a Cocoapods and SPM installation and it runs fine.

Any tips on how to properly add ARCore to my project without using Cocoapods?

Xcode 14.1
iOS 16.0.2

[Nick Jensen]

I've found something strange. If I attempt to create the GARSession a second time after a delay, it will succeed. Additionally, after it succeeds once, it will succeed all subsequent times on all future runs, until the app is uninstalled.

Here is some code demonstrating the problem:

import UIKit
import FirebaseCore
import ARCoreGARSession

@main
class AppDelegate: UIResponder, UIApplicationDelegate {

    var garSession: GARSession?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        FirebaseApp.configure()

        do {
            // first attempt to create a `GARSession` always fails and returns nil
            print("first attempt creating GARSession")
            garSession = try GARSession(apiKey: "my-api-key", bundleIdentifier: nil)
        } catch {
            // GARSession Code=-1 is thrown here
            print("error: \(error)")
        }
        print("after first attempt, garSession = \(garSession)")

        if garSession == nil {
            print("failed to create garSession, delaying 5 seconds...")
            // adding a second creation attempt after delay will succeed
            DispatchQueue.main.asyncAfter(deadline: .now() + 5.0) {
                print("second attempt creating GARSession")
                // this succeeds, and after it does all future attempts will succeed until the app is uninstalled
                self.garSession = try? GARSession(apiKey: "my-api-key", bundleIdentifier: nil)
                print("after second attempt, garSession = \(self.garSession)")
            }
        }

        return true
    }
}

Tested on:
Xcode 14.1
ARCore-1.35.0
iPhone 14 Pro running iOS 16.1.1
iPhone 13 Pro running iOS 16.0.2

[Nick Jensen]

Example Xcode project here: https://drive.google.com/file/d/1WTmRT8wmsXMSFSph7mu3WXE_coKNI6sf/view?usp=sharing

[John Ullman]

Please refrain from opening GitHub issues if you are not using a supported integration method (either CocoaPods or Swift Package Manager).