Fix Flutter Xcode Code Signing Failure | Generated by AI

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You’re hitting the common Flutter / Xcode code-signing failure: Xcode/security found no valid signing identities, so flutter run can’t sign the app for a physical device. Below I’ll give a clear, ordered set of fixes and troubleshooting commands — pick the path you want (run in Simulator right now, or set up signing to run on a real device). I won’t ask for more info — I’ll assume you want to fix this now.

Quick options (pick one)

A — Run on simulator (no code signing required) If you just want to run quickly without dealing with certificates:

  1. Open Simulator: open -a Simulator
  2. Run Flutter targeting the simulator: flutter run -d "$(xcrun simctl list devices | grep -m1 -o "iPhone.*(Simulator)" | sed 's/ (Simulator)//')" Or more simply: flutter run -d iPhone-14 (replace with an available simulator name shown by xcrun simctl list).

B — Fix signing to deploy to a real device (recommended for device testing) Follow the steps below in order.

Steps to fix signing for device deployment

1) Confirm environment & basic checks

Run these and note output:

flutter doctor -v
xcode-select --print-path
xcodebuild -version
security find-identity -p codesigning -v
xcrun simctl list devices

security find-identity -p codesigning -v should show at least one identity. Yours showed 0 valid identities found — that’s why it fails.

2) Use Xcode automatic signing (easiest)

  1. Open workspace: open ios/Runner.xcworkspace
  2. In Xcode: select the Runner project → Runner target → Signing & Capabilities.

  3. Set Team to your Apple ID / Apple Developer account. If your Apple ID is not added:

    • Xcode → Preferences → Accounts → + → add Apple ID.
  4. Tick Automatically manage signing.
  5. Ensure the Bundle Identifier is unique (reverse-DNS style, e.g. com.yourname.yourapp).
  6. Xcode will attempt to create a development certificate & provisioning profile; if you see prompts, allow Xcode to manage it.

Note: For full device deployment to an arbitrary device you need an Apple Developer membership ($99/yr). Xcode can use a free Apple ID for “free provisioning”, but it is limited (device counts, no certain entitlements).

3) Register your device (if required)

If Xcode cannot automatically register your device, go to Apple Developer Portal → Certificates, IDs & Profiles → Devices → add device UDID. You can get device UDID by connecting device and selecting it in Xcode’s Devices and Simulators window.

4) Generate/import certificate manually (if you already have p12)

If you have a .p12 certificate and private key:

security import /path/to/certificate.p12 -k ~/Library/Keychains/login.keychain-db -P "P12_PASSWORD" -T /usr/bin/codesign

Then re-run security find-identity -p codesigning -v to confirm it appears.

5) If you prefer Xcode to create certificates for you

In Xcode → Accounts → Select your Apple ID → Manage Certificates → + → add iOS Development. This creates a cert in your keychain and shows up in security find-identity.

6) Make sure Command Line Tools are set

sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer

Then accept license if needed:

sudo xcodebuild -license accept

7) After signing is set, run from terminal

From project root:

flutter clean
flutter pub get
flutter run

If multiple devices, specify -d <device-id>.

Troubleshooting tips & common pitfalls

Useful commands copy-paste

List codesigning identities:

security find-identity -p codesigning -v

Import .p12:

security import /path/to/yourcert.p12 -k ~/Library/Keychains/login.keychain-db -P "P12PASSWORD" -T /usr/bin/codesign

Set Xcode command line tools:

sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer

Open the iOS workspace:

open ios/Runner.xcworkspace

If you want, I can

Tell me which path you chose (Simulator now / Xcode automatic / manual p12 import / CI) and paste any new errors if it still fails — I’ll give the next steps.

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