Issue injecting on real device – Code signature invalid & Unhide Symbols restart loop

[tenismiguel]

Hi John, first of all thanks for your amazing tool.

I'm having a persistent issue when trying to use InjectionNext while running my app on a real device (iPhone 16 running iOS 18.6), using Xcode 16.0.

Context:
Target device: iPhone 16 (iOS 18.6)

Xcode version: 16.0 (stable)

InjectionNext: latest release from Gumroad

Project type: SwiftUI iOS app

Compilation mode: Incremental (not Whole Module)

EMIT_FRONTEND_COMMAND_LINES: Enabled = YES in build settings

The problem:
When I try to inject changes into my app, the connection seems to be established and recompilation appears to start, but then I get persistent dlopen errors about invalid code signature on the generated .dylib. Here's an excerpt from the logs:

🔥 InjectionNext: Locating developer's Mac. Have you selected "Enable Devices"?
Broadcasting to pdp_ip1#4:5.57.7.41 to locate Injection host...
SimpleSocket/Could not send broadcast ping: No route to host
Broadcasting to en2#15:169.254.255.255 to locate Injection host...
...
🔥 Connecting to iMac-de-Miguel.home (169.254.67.84)...
🔥 InjectionNext: iPhoneOS connection to app established, waiting for commands.
🔥 Recompiling: /Users/miguel/Documents/StockManager/StockManager/ContentView.swift
🔥 ⚠️ dlopen failed dlopen(/private/var/mobile/Containers/Data/Application/.../tmp/eval_injection_ContentView_1.dylib, 0x0002): ... code signature invalid ... errno=1 ...
🔥 Injection could not load. If this was due to a default argument. Select the app's menu item "Unhide Symbols".
I tried using the “Unhide Symbols” option as recommended. It says:

🔥 0 symbols exported in 542 object files, please restart your app.
But even after restarting the app and trying again, I always get the same error — it's like I'm stuck in a loop where the code signature is always rejected.

Code setup
Here’s my current ContentView.swift:

import SwiftUI
import InjectionNext
import HotSwiftUI

struct ContentView: View {
@ObserveInjection private var inject

var body: some View {
    Text("Hola buenas")
        // .onReceive(InjectionNext.notification) {
        //     inject.invalidate()
        // }
}

}
And my main entry point:

swift
Copiar
Editar
import SwiftUI
import FirebaseCore

class AppDelegate: NSObject, UIApplicationDelegate {
func application(
_ application: UIApplication,
didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]? = nil
) -> Bool {
FirebaseApp.configure()
return true
}
}

@main
struct StockManagerApp: App {
@UIApplicationDelegateAdaptor(AppDelegate.self) var delegate

var body: some Scene {
    WindowGroup {
        ContentView()
    }
}

}

What I've tried so far:
Manually re-signing the app binary with my Apple Development certificate using codesign --force --deep ...

Confirmed valid entitlements

Verified dylib is generated at expected path, but code signature always fails

Cleaned build folder & rebuilt

Recompiled with file edits

Confirmed EMIT_FRONTEND_COMMAND_LINES is working

Disabled Whole Module Optimization

What I'm asking:
Is there anything else I can try to make InjectionNext work with real devices under iOS 18.6 and Xcode 16.0?

I’d really appreciate any pointers, or if there's a fix or workaround you could suggest. I’d love to continue using InjectionNext on-device for faster iteration.

Thanks a lot for your help!

Miguel

[johnno1962]

HI, you're doing all the right things but either the app isn't code signing or using the wrong identity. When you selected "Enable Devices" did you select the correct code signing identity for your iOS devices?

[johnno1962]

Hmm, check in the KeyChain.app that you don't have an expired certificate laying around with the same identity.

[johnno1962]

This is a code signing SNAFU. Is there a reason why you're using Xcode 16.0? Have you tried a more recent one?

[tenismiguel]

The reason is because I wanted to develop applications for iOS 18.6 and be able to simulate them on my iPhone 11 (with iOS 18.6). So, do you think I should upgrade to a newer version of Xcode to develop for the version I want? If so, which version do you recommend, and should I uninstall the previous one?

[johnno1962]

Leave your old Xcode where it is in case and you can download the .xip file from https://developer.apple.com/download/all/ and uncompressed it in ~/Downloads then rename it move it and run it in /Applications. Seems like KeyChain.app doesn't exists any more so I don't know how to check for duplicates now. Check in your build logs that the code signing phase of your app uses the same identity as the one you select in InjectionNext.

[tenismiguel]

The thing is, I have Sequoia as my OS, and for versions prior to 16.0, I need Sonoma. Is there no version of Xcode with a version higher than 16.0 for developing on devices with iOS 18.6 with injection?

[johnno1962]

I'm talking about versions of Xcode more recent than 16.0 e.g. 16.2, 16.4 which I run on Sequoia. If you phone is 18.6 you should still be able to use it with more recent Xcodes.

[johnno1962]

I'm afraid there is very little I can do to help you resolve your code signing issues from this end. I have had a user with problems "loading the dylib" which we never worked out what the problem was but it seemed to be specific to their device. Try starting over with a simple example app, first in the simulator then try on your device.

[bestswifter]

I've met totally same issue in an empty app

[WageSapta]

i get same error on a real device, but it works on the simulator

[johnno1962]

What version of iOS, Xcode macOS are you all running?

[Cold-sand]

"I am using Xcode 26.2 on macOS 26.3, and debugging on an iPhone 13 running iOS 26.3. I encountered a similar issue during compilation."
🔥 Recompiling: /Users/cold_sand/Documents/code/lumen-diary/iosApp/iosApp/Views/MainView.swift

🔥 Codesigning dylib with identity 4E972DE6FC********9E98A

🔥 ℹ️ Loading /private/var/containers/Bundle/Application/F8D33F2*****F4/LumenDiary.app/Frameworks/StoreKitTest.framework/StoreKitTest

🔥 ⚠️ dlopen failed dlopen(/private/var/mobile/Containers/Data/Application/5560B1CB-BF18-4709-A0CB-C565AF9C62A4/tmp//eval_injection_MainView_1.dylib, 0x0002): tried: '/usr/lib/system/introspection/eval_injection_MainView_1.dylib' (no such file, not in dyld cache), '/private/var/mobile/Containers/Data/Application/5560B1CB-BF18-4709-A0CB-C565AF9C62A4/tmp//eval_injection_MainView_1.dylib' (code signature invalid in '/private/var/mobile/Containers/Data/Application/5560B1CB-BF18-4709-A0CB-C565AF9C62A4/tmp/eval_injection_MainView_1.dylib' (errno=1) sliceOffset=0x00000000, codeBlobOffset=0x0006C9E0, codeBlobSize=0x00004E70), '/private/preboot/Cryptexes/OS/private/var/mobile/Containers/Data/Application/5560B1CB-BF18-4709-A0CB-C565AF9C62A4/tmp//eval_injection_MainView_1.dylib' (no such file), '/private/var/mobile/Containers/Data/Application/5560B1CB-BF18-4709-A0CB-C565AF9C62A4/tmp//eval_injection_MainView_1.dylib' (code signature invalid in '/private/var/mobile/Containers/Data/Application/5560B1CB-BF18-4709-A0CB-C565AF9C62A4/tmp/eval_injection_MainView_1.dylib' (errno=1) sliceOffset=0x00000000, codeBlobOffset=0x0006C9E0, codeBlobSize=0x00004E70), '/usr/lib/system/introspection/eval_injection_MainView_1.dylib' (no such file, not in dyld cache), '/private/var/mobile/Containers/Data/Application/5560B1CB-BF18-4709-A0CB-C565AF9C62A4/tmp/eval_injection_MainView_1.dylib' (code signature invalid in '/private/var/mobile/Containers/Data/Application/5560B1CB-BF18-4709-A0CB-C565AF9C62A4/tmp/eval_injection_MainView_1.dylib' (errno=1) sliceOffset=0x00000000, codeBlobOffset=0x0006C9E0, codeBlobSize=0x00004E70), '/private/preboot/Cryptexes/OS/private/var/mobile/Containers/Data/Application/5560B1CB-BF18-4709-A0CB-C565AF9C62A4/tmp/eval_injection_MainView_1.dylib' (no such file), '/private/var/mobile/Containers/Data/Application/5560B1CB-BF18-4709-A0CB-C565AF9C62A4/tmp/eval_injection_MainView_1.dylib' (code signature invalid in '/private/var/mobile/Containers/Data/Application/5560B1CB-BF18-4709-A0CB-C565AF9C62A4/tmp/eval_injection_MainView_1.dylib' (errno=1) sliceOffset=0x00000000, codeBlobOffset=0x0006C9E0, codeBlobSize=0x00004E70)

🔥 Injection could not load. If this was due to a default argument. Select the app's menu item "Unhide Symbols".

[johnno1962]

Are you codesigning with the right "Apple Developer" identity? You can select it in the pop-up when you run "Enable Devices" off and on again. Check that the one you come corresponds with the one Xcode uses when it links your app in the build log.