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flutter doctorを使って開発環境を構築する

背景

前回flutter doctorの実行で躓いてしまいました。今回はflutter doctorで状況を確認し、開発環境を構築するところまで行いたいと思います。

flutter doctorの実行

まずflutter doctorを実行して状況を確認します。

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$ ./bin/flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 2.10.3, on macOS 11.6 20G165 darwin-x64, locale ja-JP)
[✗] Android toolchain - develop for Android devices
    ✗ Unable to locate Android SDK.
      Install Android Studio from: https://developer.android.com/studio/index.html
      On first launch it will assist you in installing the Android SDK components.
      (or visit https://flutter.dev/docs/get-started/install/macos#android-setup for
      detailed instructions).
      If the Android SDK has been installed to a custom location, please use
      `flutter config --android-sdk` to update to that location.

[✗] Xcode - develop for iOS and macOS
    ✗ Xcode installation is incomplete; a full installation is necessary for iOS
      development.
      Download at: https://developer.apple.com/xcode/download/
      Or install Xcode via the App Store.
      Once installed, run:
        sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer
        sudo xcodebuild -runFirstLaunch
    ✗ CocoaPods not installed.
        CocoaPods is used to retrieve the iOS and macOS platform side's plugin code that
        responds to your plugin usage on the Dart side.
        Without CocoaPods, plugins will not work on iOS or macOS.
        For more info, see https://flutter.dev/platform-plugins
      To install see https://guides.cocoapods.org/using/getting-started.html#installation
      for instructions.
[✓] Chrome - develop for the web
[!] Android Studio (not installed)
[✓] VS Code (version 1.65.0)
[!] Proxy Configuration
    ! NO_PROXY does not contain 127.0.0.1
    ! NO_PROXY does not contain ::1
[✓] Connected device (1 available)
[✓] HTTP Host Availability

! Doctor found issues in 4 categories.

バツと！になっている箇所について対応が必要そうです。

Xcodeのインストール

まずは簡単そうなXcodeのインストールから行います。

App Storeからダウンロード

まずApp StoreからXcodeをインストールします。

ライセンスに同意する

ライセンスに同意する必要があるので、以下のコマンドを実行します

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$ sudo xcodebuild -license

するとライセンスに関する文面が表示されます。スペースキーでページ送りをして、最後に以下の表示になったらagreeとタイプしてエンターキーを押します。

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By typing 'agree' you are agreeing to the terms of the software license agreements. Type 'print' to print them or anything else to cancel, [agree, print, cancel] agree

You can view the license agreements in Xcode's About Box, or at /Applications/Xcode.app/Contents/Resources/English.lproj/License.rtf

状況確認

Xcodeがインストールできたので、再度flutter doctorで確認します。

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$ flutter doctor
...（省略）...
[!] Xcode - develop for iOS and macOS (Xcode 13.2.1)
    ✗ CocoaPods not installed.
        CocoaPods is used to retrieve the iOS and macOS platform side's plugin code that
        responds to your plugin usage on the Dart side.
        Without CocoaPods, plugins will not work on iOS or macOS.
        For more info, see https://flutter.dev/platform-plugins
      To install see https://guides.cocoapods.org/using/getting-started.html#installation
      for instructions.
...（省略）...

ということで、CocoaPodsのインストールが必要でした。

CocoaPodsのインストール

先程のflutter doctorのメッセージにあるインストールのドキュメントを見てみます。

冒頭にYou can use a Ruby Version manager, however we recommend that you use the standard Ruby available on macOS unless you know what you're doing.とあるので、グローバルにインストールされているRubyを利用しようと思います。

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$ which ruby
/Users/user/.anyenv/envs/rbenv/shims/ruby
$ ruby -v
ruby 2.6.3p62 (2019-04-16 revision 67580) [universal.x86_64-darwin20]
$ rbenv versions
* system
  2.4.10
  3.1.0

グローバルにインストールされているRubyが2.6.3ということですね。こちらにインストールします。

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$ sudo /usr/bin/gem install cocoapods
Password:
Fetching concurrent-ruby-1.1.9.gem
Fetching tzinfo-2.0.4.gem
Fetching zeitwerk-2.5.4.gem
Fetching activesupport-6.1.5.gem
Fetching fuzzy_match-2.0.4.gem
Fetching i18n-1.10.0.gem
Fetching nap-1.1.0.gem
Fetching httpclient-2.8.3.gem
Fetching algoliasearch-1.27.5.gem
Fetching ffi-1.15.5.gem
Fetching ethon-0.15.0.gem
Fetching typhoeus-1.4.0.gem
Fetching netrc-0.11.0.gem
Fetching public_suffix-4.0.6.gem
Fetching addressable-2.8.0.gem
Fetching cocoapods-core-1.11.3.gem
Fetching claide-1.1.0.gem
Fetching cocoapods-deintegrate-1.0.5.gem
Fetching cocoapods-downloader-1.5.1.gem
Fetching cocoapods-plugins-1.0.0.gem
Fetching cocoapods-search-1.0.1.gem
Fetching cocoapods-trunk-1.6.0.gem
Fetching cocoapods-try-1.2.0.gem
Fetching molinillo-0.8.0.gem
Fetching atomos-0.1.3.gem
Fetching colored2-3.1.2.gem
Fetching nanaimo-0.3.0.gem
Fetching rexml-3.2.5.gem
Fetching xcodeproj-1.21.0.gem
Fetching escape-0.0.4.gem
Fetching fourflusher-2.3.1.gem
Fetching gh_inspector-1.1.3.gem
Fetching ruby-macho-2.5.1.gem
Fetching cocoapods-1.11.3.gem
Successfully installed concurrent-ruby-1.1.9
Successfully installed i18n-1.10.0
Successfully installed tzinfo-2.0.4
Successfully installed zeitwerk-2.5.4
Successfully installed activesupport-6.1.5
Successfully installed nap-1.1.0
Successfully installed fuzzy_match-2.0.4
Successfully installed httpclient-2.8.3
A new major version is available for Algolia! Please now use the https://rubygems.org/gems/algolia gem to get the latest features.
Successfully installed algoliasearch-1.27.5
Building native extensions. This could take a while...
ERROR:  Error installing cocoapods:
        ERROR: Failed to build gem native extension.

    current directory: /Library/Ruby/Gems/2.6.0/gems/ffi-1.15.5/ext/ffi_c
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/bin/ruby -I /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0 -r ./siteconf20220317-44199-1ctmdly.rb extconf.rb
checking for ffi.h... *** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.  Check the mkmf.log file for more details.  You may
need configuration options.

Provided configuration options:
        --with-opt-dir
        --without-opt-dir
        --with-opt-include
        --without-opt-include=${opt-dir}/include
        --with-opt-lib
        --without-opt-lib=${opt-dir}/lib
        --with-make-prog
        --without-make-prog
        --srcdir=.
        --curdir
        --ruby=/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/bin/$(RUBY_BASE_NAME)
        --with-ffi_c-dir
        --without-ffi_c-dir
        --with-ffi_c-include
        --without-ffi_c-include=${ffi_c-dir}/include
        --with-ffi_c-lib
        --without-ffi_c-lib=${ffi_c-dir}/lib
        --enable-system-libffi
        --disable-system-libffi
        --with-libffi-config
        --without-libffi-config
        --with-pkg-config
        --without-pkg-config
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/mkmf.rb:467:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
        from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/mkmf.rb:585:in `block in try_compile'
        from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/mkmf.rb:534:in `with_werror'
        from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/mkmf.rb:585:in `try_compile'
        from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/mkmf.rb:1109:in `block in have_header'
        from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/mkmf.rb:959:in `block in checking_for'
        from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/mkmf.rb:361:in `block (2 levels) in postpone'
        from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/mkmf.rb:331:in `open'
        from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/mkmf.rb:361:in `block in postpone'
        from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/mkmf.rb:331:in `open'
        from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/mkmf.rb:357:in `postpone'
        from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/mkmf.rb:958:in `checking_for'
        from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/mkmf.rb:1108:in `have_header'
        from extconf.rb:10:in `system_libffi_usable?'
        from extconf.rb:42:in `<main>'

To see why this extension failed to compile, please check the mkmf.log which can be found here:

  /Library/Ruby/Gems/2.6.0/extensions/universal-darwin-20/2.6.0/ffi-1.15.5/mkmf.log

extconf failed, exit code 1

Gem files will remain installed in /Library/Ruby/Gems/2.6.0/gems/ffi-1.15.5 for inspection.
Results logged to /Library/Ruby/Gems/2.6.0/extensions/universal-darwin-20/2.6.0/ffi-1.15.5/gem_make.out

エラーが発生してしまいました。メッセージを確認すると、ffi.hが見つからないということのようです。

libffiがインストールされていないからかもしれないので、インストールしてみます。

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$ brew install libffi
Running `brew update --preinstall`...
...（省略）...
==> Downloading https://ghcr.io/v2/homebrew/core/libffi/manifests/3.4.2
######################################################################## 100.0%
==> Downloading https://ghcr.io/v2/homebrew/core/libffi/blobs/sha256:a461f6ad21a23a725691385dbbec3eff958cf61d5282e84dc3f0483e307e1875
==> Downloading from https://pkg-containers.githubusercontent.com/ghcr1/blobs/sha256:a461f6ad21a23a725691385dbbec3eff958cf61d5282e84dc3f0483e307e1875?se=202
######################################################################## 100.0%
==> Pouring libffi--3.4.2.big_sur.bottle.tar.gz
==> Caveats
libffi is keg-only, which means it was not symlinked into /usr/local,
because macOS already provides this software and installing another version in
parallel can cause all kinds of trouble.

For compilers to find libffi you may need to set:
  export LDFLAGS="-L/usr/local/opt/libffi/lib"
  export CPPFLAGS="-I/usr/local/opt/libffi/include"

==> Summary
🍺  /usr/local/Cellar/libffi/3.4.2: 17 files, 599.8KB
==> `brew cleanup` has not been run in the last 30 days, running now...
Disable this behaviour by setting HOMEBREW_NO_INSTALL_CLEANUP.
Hide these hints with HOMEBREW_NO_ENV_HINTS (see `man brew`).
Removing: /Users/user/Library/Caches/Homebrew/icu4c--69.1... (27.2MB)
Removing: /Users/user/Library/Caches/Homebrew/nkf--2.1.5... (167KB)
Removing: /Users/user/Library/Caches/Homebrew/nkf_bottle_manifest--2.1.5... (7.9KB)
Removing: /Users/user/Library/Logs/Homebrew/telnet... (64B)

インストールできました。しかし、再度cocoapodsをインストールしようとしても同じエラーで止まります。

エラーログを見てみると、ruby/config.hが見つからないということで、シンボリックリンクを作成してみました。

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$ cd /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.1.sdk/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/include/ruby-2.6.0/ruby
$ sudo ln -sf ../../../../Headers/ruby/config.h

すると、内容は変わったのですが、いまだにエラーは出ます。

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current directory: /Library/Ruby/Gems/2.6.0/gems/ffi-1.15.5/ext/ffi_c
make "DESTDIR="
make: *** No rule to make target `/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.1.sdk/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/include/ruby-2.6.0/universal-darwin20/ruby/config.h', needed by `AbstractMemory.o'.  Stop.

make failed, exit code 2

Gem files will remain installed in /Library/Ruby/Gems/2.6.0/gems/ffi-1.15.5 for inspection.
Results logged to /Library/Ruby/Gems/2.6.0/extensions/universal-darwin-20/2.6.0/ffi-1.15.5/gem_make.out

よくみると、universal-darwin20と書かれています。Rubyのバージョンにもそのように書いてありました。しかし、実際に存在するディレクトリはuniversal-darwin21です。この記事を参考に、シンボリックリンクを作成します。

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$ cd /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.1.sdk/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/include/ruby-2.6.0/
$ sudo ln -s universal-darwin21 universal-darwin20

再度試します

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$ sudo gem install cocoapods
Password:
Building native extensions. This could take a while...
Successfully installed ffi-1.15.5
Successfully installed ethon-0.15.0
Successfully installed typhoeus-1.4.0
Successfully installed netrc-0.11.0
Successfully installed public_suffix-4.0.6
Successfully installed addressable-2.8.0
Successfully installed cocoapods-core-1.11.3
Successfully installed claide-1.1.0
Successfully installed cocoapods-deintegrate-1.0.5
Successfully installed cocoapods-downloader-1.5.1
Successfully installed cocoapods-plugins-1.0.0
Successfully installed cocoapods-search-1.0.1
Successfully installed cocoapods-trunk-1.6.0
Successfully installed cocoapods-try-1.2.0
Successfully installed molinillo-0.8.0
Successfully installed atomos-0.1.3
Successfully installed colored2-3.1.2
Successfully installed nanaimo-0.3.0
Successfully installed rexml-3.2.5
Successfully installed xcodeproj-1.21.0
Successfully installed escape-0.0.4
Successfully installed fourflusher-2.3.1
Successfully installed gh_inspector-1.1.3
Successfully installed ruby-macho-2.5.1
Successfully installed cocoapods-1.11.3
Parsing documentation for ffi-1.15.5
Installing ri documentation for ffi-1.15.5
Parsing documentation for ethon-0.15.0
Installing ri documentation for ethon-0.15.0
Parsing documentation for typhoeus-1.4.0
Installing ri documentation for typhoeus-1.4.0
Parsing documentation for netrc-0.11.0
Installing ri documentation for netrc-0.11.0
Parsing documentation for public_suffix-4.0.6
Installing ri documentation for public_suffix-4.0.6
Parsing documentation for addressable-2.8.0
Installing ri documentation for addressable-2.8.0
Parsing documentation for cocoapods-core-1.11.3
Installing ri documentation for cocoapods-core-1.11.3
Parsing documentation for claide-1.1.0
Installing ri documentation for claide-1.1.0
Parsing documentation for cocoapods-deintegrate-1.0.5
Installing ri documentation for cocoapods-deintegrate-1.0.5
Parsing documentation for cocoapods-downloader-1.5.1
Installing ri documentation for cocoapods-downloader-1.5.1
Parsing documentation for cocoapods-plugins-1.0.0
Installing ri documentation for cocoapods-plugins-1.0.0
Parsing documentation for cocoapods-search-1.0.1
Installing ri documentation for cocoapods-search-1.0.1
Parsing documentation for cocoapods-trunk-1.6.0
Installing ri documentation for cocoapods-trunk-1.6.0
Parsing documentation for cocoapods-try-1.2.0
Installing ri documentation for cocoapods-try-1.2.0
Parsing documentation for molinillo-0.8.0
Installing ri documentation for molinillo-0.8.0
Parsing documentation for atomos-0.1.3
Installing ri documentation for atomos-0.1.3
Parsing documentation for colored2-3.1.2
Installing ri documentation for colored2-3.1.2
Parsing documentation for nanaimo-0.3.0
Installing ri documentation for nanaimo-0.3.0
Parsing documentation for rexml-3.2.5
Installing ri documentation for rexml-3.2.5
Parsing documentation for xcodeproj-1.21.0
Installing ri documentation for xcodeproj-1.21.0
Parsing documentation for escape-0.0.4
Installing ri documentation for escape-0.0.4
Parsing documentation for fourflusher-2.3.1
Installing ri documentation for fourflusher-2.3.1
Parsing documentation for gh_inspector-1.1.3
Installing ri documentation for gh_inspector-1.1.3
Parsing documentation for ruby-macho-2.5.1
Installing ri documentation for ruby-macho-2.5.1
Parsing documentation for cocoapods-1.11.3
Installing ri documentation for cocoapods-1.11.3
Done installing documentation for ffi, ethon, typhoeus, netrc, public_suffix, addressable, cocoapods-core, claide, cocoapods-deintegrate, cocoapods-downloader, cocoapods-plugins, cocoapods-search, cocoapods-trunk, cocoapods-try, molinillo, atomos, colored2, nanaimo, rexml, xcodeproj, escape, fourflusher, gh_inspector, ruby-macho, cocoapods after 26 seconds
25 gems installed

無事インストールできました。

flutter doctorで確認します。

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$ ./bin/flutter doctor
...（省略）...
[✓] Xcode - develop for iOS and macOS (Xcode 13.2.1)
...（省略）...

Xcodeはクリアしました。

Android toolchainのインストール

次にAndroid toolchainをインストールします。flutter doctorの出力にあるサイトからダウンロードしてインストールします。

ダウンロードしたdmgをダブルクリックし、アプリケーションアイコンをアプリケーションディレクトリにドラッグ＆ドロップします。

インストールが終わったら、On first launch it will assist you in installing the Android SDK components.と書かれているので、Android Studioを起動します。

利用規約に同意してその他のコンポーネントをインストールします。

ここまで終わったらflutter doctorで確認します。

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$ ./bin/flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 2.10.3, on macOS 11.6.4 20G417 darwin-x64, locale ja-JP)
[!] Android toolchain - develop for Android devices (Android SDK version 32.1.0-rc1)
    ✗ cmdline-tools component is missing
      Run `path/to/sdkmanager --install "cmdline-tools;latest"`
      See https://developer.android.com/studio/command-line for more details.
    ✗ Android license status unknown.
      Run `flutter doctor --android-licenses` to accept the SDK licenses.
      See https://flutter.dev/docs/get-started/install/macos#android-setup for more details.
...（省略）...

まだ足りないようでした。メッセージに従ってコマンドを実行していきます。

Android SDK Command-line Toolsのインストール

sdkmanagerのパスがわからなかったので、GUIで設定しました。

Android Studioを起動し、メニューのAndroid Studio->Preferenceを選択し、左メニューのAppearance & Behavior->System Setting->Android SDKを選択します。

右のタブでSDK Toolsを選択し、下に表示される一覧の中にAndroid SDK Command-line Tools (latest)にチェックを入れ、右下のApplyボタンをクリックします。

するとダウンロードとインストールが始まります。終わったらOKをクリックします。

ライセンスの同意

次にライセンスに同意します。メッセージに記載のあるコマンドを実行します。

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$ ./bin/flutter doctor --android-licenses 
Warning: Failed to download any source lists! Fetch remote repository...        
Warning: Still waiting for package manifests to be fetched remotely.            
Warning: Still waiting for package manifests to be fetched remotely.y...        
Warning: Still waiting for package manifests to be fetched remotely.y...        
Warning: Still waiting for package manifests to be fetched remotely.y...        
Warning: Still waiting for package manifests to be fetched remotely.y...        
Warning: Still waiting for package manifests to be fetched remotely.y...        
Warning: Still waiting for package manifests to be fetched remotely.y...        
Warning: IO exception while downloading manifesttch remote repository...        
Warning: IO exception while downloading manifest
Warning: Still waiting for package manifests to be fetched remotely.y...        
All SDK package licenses accepted.======] 100% Computing updates...

だいぶ時間がかかりますし、うまくいってないようなメッセージが出ますが、結果的に全てのライセンスに同意できています。

それではflutter doctorで確認します。

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$ ./bin/flutter doctor                   
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 2.10.3, on macOS 11.6.4 20G417 darwin-x64, locale ja-JP)
[✓] Android toolchain - develop for Android devices (Android SDK version 32.1.0-rc1)
[✓] Xcode - develop for iOS and macOS (Xcode 13.2.1)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2021.1)
[✓] VS Code (version 1.65.2)
[!] Proxy Configuration
    ! NO_PROXY does not contain 127.0.0.1
    ! NO_PROXY does not contain ::1
[✓] Connected device (1 available)
[!] HTTP Host Availability
    ✗ HTTP host https://maven.google.com/ is not reachable. Reason: An error occurred while checking the HTTP host: Operation timed out
    ✗ HTTP host https://pub.dev/ is not reachable. Reason: An error occurred while checking the HTTP host: Operation timed out
    ✗ HTTP host https://cloud.google.com/ is not reachable. Reason: An error occurred while checking the HTTP host: Operation timed out

! Doctor found issues in 2 categories.

もう少しですね…

NO_PROXYの設定

NO_PROXYの設定はコマンドを実行するシェルで環境変数を設定するのだろうと思うので設定してみます。

~/.zshrcにNO_PROXYを設定します

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NO_PROXY=localhost,127.0.0.1,::1

シェルを再起動します

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$ exec $SHELL -l

環境変数を確認します

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$ env | grep -i no_proxy
NO_PROXY=localhost,127.0.0.1,::1

設定できました。

HTTP Host Availabilityの対応

環境変数のPROXYの設定が悪さをしていて、外部へのアクセスができてなかったので、unsetコマンドで削除しました。

最後にflutter doctorで確認します。

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$ ./bin/flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 2.10.3, on macOS 11.6.4 20G417 darwin-x64, locale ja-JP)
[!] Android toolchain - develop for Android devices (Android SDK version 32.1.0-rc1)
    ! Some Android licenses not accepted.  To resolve this, run: flutter doctor --android-licenses
[✓] Xcode - develop for iOS and macOS (Xcode 13.2.1)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2021.1)
[✓] VS Code (version 1.65.2)
[✓] Connected device (1 available)
[✓] HTTP Host Availability

なぜかまたライセンスで！になっているので、コマンドを実行します。（やはり先程はエラーになっていたようです）

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$ ./bin/flutter doctor --android-licenses
5 of 7 SDK package licenses not accepted. 100% Computing updates...             
Review licenses that have not been accepted (y/N)? y

1/5: License android-googletv-license:
...（省略）...

ライセンスが表示されるのでyを押して同意します。

今度こそ最後にflutter doctorで確認します。

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$ ./bin/flutter doctor                   
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 2.10.3, on macOS 11.6.4 20G417 darwin-x64, locale ja-JP)
[✓] Android toolchain - develop for Android devices (Android SDK version 32.1.0-rc1)
[✓] Xcode - develop for iOS and macOS (Xcode 13.2.1)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2021.1)
[✓] VS Code (version 1.65.2)
[✓] Connected device (1 available)
[✓] HTTP Host Availability

• No issues found!

すべてクリアできました！

まとめ

flutter doctorですべてOKになるところまで実施しました。

大きく時間がかかったのはcocoapodsのインストールだけでした。こちらもMacのバージョンを上げたりしていなければ（darwin20とdarwin21の違い）、スムーズに進んだと思います。

とりあえず環境構築はできました。次からはモバイルアプリの開発を進めていきたいと思います。

参考図書