When using a Flutter plugin that does not yet support SwiftPM, however, the plugin has a dependency on a plugin (via podspec) that does support SwiftPM, the build will fail due to CocoaPods not being able to find it.
For example:
flutter config --enable-swift-package-mangerflutter create my_app && cd my_appflutter pub add google_mobile_adsflutter build ios
This results in an error:
Running pod install... 539ms
CocoaPods' output:
↳
Preparing
Analyzing dependencies
Inspecting targets to integrate
Using `ARCHS` setting to build architectures of target `Pods-Runner`: (``)
Using `ARCHS` setting to build architectures of target `Pods-RunnerTests`: (``)
Fetching external sources
-> Fetching podspec for `Flutter` from `Flutter`
-> Fetching podspec for `google_mobile_ads` from `.symlinks/plugins/google_mobile_ads/ios`
Resolving dependencies of `Podfile`
CDN: trunk Relative path: CocoaPods-version.yml exists! Returning local because checking is only performed in repo update
CDN: trunk Relative path: all_pods_versions_5_9_a.txt exists! Returning local because checking is only performed in repo
update
CDN: trunk Relative path: Specs/5/9/a/Google-Mobile-Ads-SDK/12.14.0/Google-Mobile-Ads-SDK.podspec.json exists! Returning local
because checking is only performed in repo update
CDN: trunk Relative path: all_pods_versions_e_9_b.txt exists! Returning local because checking is only performed in repo
update
[!] Unable to find a specification for `webview_flutter_wkwebview` depended upon by `google_mobile_ads`
You have either:
* out-of-date source repos which you can update with `pod repo update` or with `pod install --repo-update`.
* mistyped the name or version.
* not added the source repo that hosts the Podspec to your Podfile.
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.16.2/lib/cocoapods/resolver.rb:389:in `find_cached_set'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.16.2/lib/cocoapods/resolver.rb:360:in `specifications_for_dependency'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.16.2/lib/cocoapods/resolver.rb:165:in `search_for'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.16.2/lib/cocoapods/resolver.rb:274:in `block in sort_dependencies'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.16.2/lib/cocoapods/resolver.rb:267:in `each'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.16.2/lib/cocoapods/resolver.rb:267:in `sort_by'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.16.2/lib/cocoapods/resolver.rb:267:in `sort_by!'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.16.2/lib/cocoapods/resolver.rb:267:in `sort_dependencies'
/Library/Ruby/Gems/2.6.0/gems/molinillo-0.8.0/lib/molinillo/delegates/specification_provider.rb:60:in `block in
sort_dependencies'
/Library/Ruby/Gems/2.6.0/gems/molinillo-0.8.0/lib/molinillo/delegates/specification_provider.rb:77:in
`with_no_such_dependency_error_handling'
/Library/Ruby/Gems/2.6.0/gems/molinillo-0.8.0/lib/molinillo/delegates/specification_provider.rb:59:in `sort_dependencies'
/Library/Ruby/Gems/2.6.0/gems/molinillo-0.8.0/lib/molinillo/resolution.rb:754:in `push_state_for_requirements'
/Library/Ruby/Gems/2.6.0/gems/molinillo-0.8.0/lib/molinillo/resolution.rb:744:in `require_nested_dependencies_for'
/Library/Ruby/Gems/2.6.0/gems/molinillo-0.8.0/lib/molinillo/resolution.rb:727:in `activate_new_spec'
/Library/Ruby/Gems/2.6.0/gems/molinillo-0.8.0/lib/molinillo/resolution.rb:684: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-1.16.2/lib/cocoapods/resolver.rb:94:in `resolve'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.16.2/lib/cocoapods/installer/analyzer.rb:1082:in `block in resolve_dependencies'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.16.2/lib/cocoapods/user_interface.rb:64:in `section'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.16.2/lib/cocoapods/installer/analyzer.rb:1080:in `resolve_dependencies'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.16.2/lib/cocoapods/installer/analyzer.rb:125:in `analyze'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.16.2/lib/cocoapods/installer.rb:422:in `analyze'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.16.2/lib/cocoapods/installer.rb:244:in `block in resolve_dependencies'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.16.2/lib/cocoapods/user_interface.rb:64:in `section'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.16.2/lib/cocoapods/installer.rb:243:in `resolve_dependencies'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.16.2/lib/cocoapods/installer.rb:162:in `install!'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.16.2/lib/cocoapods/command/install.rb:52:in `run'
/Library/Ruby/Gems/2.6.0/gems/claide-1.1.0/lib/claide/command.rb:334:in `run'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.16.2/lib/cocoapods/command.rb:52:in `run'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.16.2/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 `13.0` 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: CocoaPods's specs repository is too out-of-date to satisfy dependencies.
To update the CocoaPods specs, run:
pod repo update
Error running pod install
This is due to google_mobile_ads only supporting CocoaPods, but having a pod-level dependency on webview_flutter_wkwebview, which does support SwiftPM. webview_flutter_wkwebview is being built by SwiftPM so when google_mobile_ads is being built, it doesn't find the dependency.
When using a Flutter plugin that does not yet support SwiftPM, however, the plugin has a dependency on a plugin (via podspec) that does support SwiftPM, the build will fail due to CocoaPods not being able to find it.
For example:
flutter config --enable-swift-package-mangerflutter create my_app && cd my_appflutter pub add google_mobile_adsflutter build iosThis results in an error:
This is due to
google_mobile_adsonly supporting CocoaPods, but having a pod-level dependency onwebview_flutter_wkwebview, which does support SwiftPM.webview_flutter_wkwebviewis being built by SwiftPM so whengoogle_mobile_adsis being built, it doesn't find the dependency.