Flutter IOS Build System

Flutter iOS Build System

Provenance: OFFICIAL SOURCE. Every step below is transcribed from the official Flutter guide — https://docs.flutter.dev/deployment/ios (Flutter 3.44.7, page updated 2026-07-31) — plus verified pitfalls from CarSah's first-ever iOS build (2026-08-13, BL-100). Where a step comes from live experience and not the official guide, it is marked [LIVE].

0. Prerequisites (hard requirements — check BEFORE anything)

1. Register the app (one-time, founder-gated)

1. Register a Bundle ID — developer.apple.com → App IDs → + → Explicit App ID → ID like com.carsah.carsah → register.
2. Create the app record — App Store Connect → Apps → + → New App → check iOS only (Flutter has NO tvOS support — leave tvOS unchecked) → Create → App Information → select the Bundle ID.

2. Review Xcode project settings

open ios/Runner.xcworkspace

Verify in the Runner target:

• General → Identity: Display Name (user-visible) + Bundle Identifier (the registered App ID).
• Signing & Capabilities: Automatically manage signing = true (default; sufficient for most apps) + Team = your Apple Developer team.
• Build Settings → Deployment: iOS Deployment Target — Flutter supports iOS 13+; raise it only if plugins need newer APIs.

3. App icon & launch image

• Replace placeholder icons in Assets.xcassets (Runner folder) with the real app icons (HIG guidelines — light/dark/tinted variants).
• Verify: flutter run for icon; hot RESTART (not hot reload) for the launch image.

4. Version numbers

• pubspec.yaml: version: 1.0.0+1 — build-name = CFBundleShortVersionString, build-number = CFBundleVersion.
• Override per build: flutter build ipa --build-name X --build-number Y.
• Each TestFlight/App Store upload requires a UNIQUE build number.

5. Build the archive + IPA

flutter build ipa

• Produces: .xcarchive in build/ios/archive/ + .ipa in build/ios/ipa/.
• Consider --obfuscate --split-debug-info for release.
• Non-App-Store distribution: --export-method ad-hoc | development | enterprise.

6. Upload to App Store Connect (3 ways)

# 1. Command line (altool):
xcrun altool --upload-app --type ios -f build/ios/ipa/*.ipa --apiKey YOUR_KEY --apiIssuer YOUR_ISSUER
# 2. Transporter macOS app — drag-drop the .ipa
# 3. Xcode — open the .xcarchive → Validate App → address issues → Distribute App

7. TestFlight release

1. App Store Connect → app → TestFlight tab → Internal Testing → select build → Save.
2. Add internal testers' emails (Users and Roles page).

• External testing requires beta review; internal testers get builds instantly (up to 100 members).

8. App Store submission

1. Pricing and Availability → complete.
2. Status sidebar → 1.0 Prepare for Submission → complete required fields.
3. Submit for Review → Apple reviews → release per Version Release settings.

9. CI/CD iOS (from the official CD guide)

• Xcode Cloud post-clone script (official pattern):

  set -e
  cd $CI_PRIMARY_REPOSITORY_PATH
  git clone https://github.com/flutter/flutter.git --depth 1 -b stable $HOME/flutter
  export PATH="$PATH:$HOME/flutter/bin"
  flutter precache --ios
  flutter pub get
  HOMEBREW_NO_AUTO_UPDATE=1 brew install cocoapods
  cd ios && pod install
  

• fastlane (official): project must build via flutter build ipa; fastlane match for certs; app-store-connect publish for upload; keychain use-login to avoid auth issues.

Pitfalls — verified live (CarSah BL-100, 2026-08-13)

1. [LIVE] Missing iOS platform SDK — flutter build ios / simulator run fails with "missing iOS 26.5 platform" when Xcode's iOS SDK isn't installed. Verify FIRST with xcodebuild -showsdks. Fix: Xcode → Settings → Components → Install iOS platform.
2. [LIVE] pod install side effects dirty the tree — running pod install / first iOS build modifies ios/Runner.xcodeproj/project.pbxproj and adds ios/Pods/ + Podfile.lock. Decide whether they are committed (they should be — podfile.lock + pbxproj are source) and check git status before assuming the tree is clean.
3. Signing identity change = uninstall + data wipe on Android (DEC-066) — the iOS equivalent: changing team/certificate can orphan provisioning; always keep the same signing identity across updates.
4. tvOS checkbox must stay unchecked — Flutter does not support tvOS; checking it creates an invalid app record.

Verification checklist (before claiming "iOS build works")

• xcodebuild -version + xcodebuild -showsdks | grep iphoneos — SDK present
• pod --version — CocoaPods installed
• flutter build ios --debug (or simulator run) — compiles without the platform error
• flutter build ipa — produces .xcarchive + .ipa
• Bundle ID matches the App Store Connect record
• Build number unique per upload