[Flutter] firebase 설치 시 pod install 에러 해결

iOS 기준,

firebase 예제에 필요한 라이브러리 설치 중 에러 발생!

Running "flutter pub get" in flutter_project...
Launching lib/main.dart on iPhone X in debug mode...
Running pod install...
CocoaPods' output:
↳
      Preparing

    Analyzing dependencies

    Inspecting targets to integrate
      Using `ARCHS` setting to build architectures of target `Pods-Runner`: (``)

    Finding Podfile changes
      A cloud_firestore
      - Flutter
      - firebase_core
      - shared_preferences_ios
      - sqflite

    Fetching external sources
    -> Fetching podspec for `Flutter` from `Flutter`
    -> Fetching podspec for `cloud_firestore` from `.symlinks/plugins/cloud_firestore/ios`
    cloud_firestore: Using Firebase SDK version '9.3.0' defined in 'firebase_core'
    -> Fetching podspec for `firebase_core` from `.symlinks/plugins/firebase_core/ios`
    firebase_core: Using Firebase SDK version '9.3.0' defined in 'firebase_core'
    -> Fetching podspec for `shared_preferences_ios` from `.symlinks/plugins/shared_preferences_ios/ios`
    -> Fetching podspec for `sqflite` from `.symlinks/plugins/sqflite/ios`

    Resolving dependencies of `Podfile`
      CDN: trunk Relative path: CocoaPods-version.yml exists! Returning local because checking is only performed in repo update
    [!] CocoaPods could not find compatible versions for pod "cloud_firestore":
      In Podfile:
        cloud_firestore (from `.symlinks/plugins/cloud_firestore/ios`)

    Specs satisfying the `cloud_firestore (from `.symlinks/plugins/cloud_firestore/ios`)` dependency were found, but they required a higher minimum deployment target.

    /Library/Ruby/Gems/2.6.0/gems/molinillo-0.8.0/lib/molinillo/resolution.rb:317:in `raise_error_unless_state'
    /Library/Ruby/Gems/2.6.0/gems/molinillo-0.8.0/lib/molinillo/resolution.rb:299:in `block in unwind_for_conflict'
    /Library/Ruby/Gems/2.6.0/gems/molinillo-0.8.0/lib/molinillo/resolution.rb:297:in `tap'
    /Library/Ruby/Gems/2.6.0/gems/molinillo-0.8.0/lib/molinillo/resolution.rb:297:in `unwind_for_conflict'
    /Library/Ruby/Gems/2.6.0/gems/molinillo-0.8.0/lib/molinillo/resolution.rb:682:in `attempt_to_activate'
    /Library/Ruby/Gems/2.6.0/gems/molinillo-0.8.0/lib/molinillo/resolution.rb:254:in `process_topmost_state'
    /Library/Ruby/Gems/2.6.0/gems/molinillo-0.8.0/lib/molinillo/resolution.rb:182:in `resolve'
    /Library/Ruby/Gems/2.6.0/gems/molinillo-0.8.0/lib/molinillo/resolver.rb:43:in `resolve'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.11.3/lib/cocoapods/resolver.rb:94:in `resolve'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.11.3/lib/cocoapods/installer/analyzer.rb:1078:in `block in resolve_dependencies'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.11.3/lib/cocoapods/user_interface.rb:64:in `section'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.11.3/lib/cocoapods/installer/analyzer.rb:1076:in `resolve_dependencies'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.11.3/lib/cocoapods/installer/analyzer.rb:124:in `analyze'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.11.3/lib/cocoapods/installer.rb:416:in `analyze'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.11.3/lib/cocoapods/installer.rb:241:in `block in resolve_dependencies'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.11.3/lib/cocoapods/user_interface.rb:64:in `section'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.11.3/lib/cocoapods/installer.rb:240:in `resolve_dependencies'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.11.3/lib/cocoapods/installer.rb:161:in `install!'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.11.3/lib/cocoapods/command/install.rb:52:in `run'
    /Library/Ruby/Gems/2.6.0/gems/claide-1.0.3/lib/claide/command.rb:334:in `run'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.11.3/lib/cocoapods/command.rb:52:in `run'
    /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.11.3/bin/pod:55:in `<top (required)>'
    /usr/local/bin/pod:23:in `load'
    /usr/local/bin/pod:23:in `<main>'

Error output from CocoaPods:
↳

    [!] Automatically assigning platform `iOS` with version `9.0` on target `Runner` because no platform was specified. Please specify a platform for this target in your Podfile. See `https://guides.cocoapods.org/syntax/podfile.html#platform`.

Error running pod install
Error launching application on iPhone X

이것이 다 뭔 소리여 -_ㅠ

...

여기서 에러 메시지를 자세히 보면

cloud_firestore: Using Firebase SDK version '9.3.0' defined in 'firebase_core'
firebase_core: Using Firebase SDK version '9.3.0' defined in 'firebase_core'

이 부분에 주목해보고자 한다

cloud_firestore와 firebase_core는 SDK 버전 9.3.0을 사용한다고라고라...

...

그럼 수정해보자

ios/Podfile에서 2번째줄을 보면 

#platform :ios, '9.0'

이라고 초기 설정되어 있을 것이다

...

이부분을 11.0으로 수정해보자. 위의 Firebase SDK 9.3.0버전보다 높여 본 것이다

그리고 나서 터미널에서 ios폴더로 들어 간 후

pod install

실행해보자

...

바로 에러가 나지 않고 시간이 걸리면서 설치가 된다

그리고 flutter 실행시에도 시간이 좀 걸리니 인내심을 갖고 기다리면 된다

 

 

 

끝.