Adding sqflite or path_provider makes Xcode fail with "file not found"

[michel....@gmail.com]

I have started playing with flutter to write an iOS version of an app I have (and possibly replace my Android version with it as well).

However, if I add sqflite or path_provider in my yaml file, I get an error during the Xcode compilation. For example, for sqflite, I get:

Running "flutter packages get" in flutter_app...
Launching lib/main.dart on iPhone X in debug mode...
Running pod install...
Running Xcode clean...
Starting Xcode build...
Xcode build done
Failed to build iOS app
Error output from Xcode build:
↳
    ** BUILD FAILED **
    
Xcode's output:
↳
    === BUILD TARGET Runner OF PROJECT Runner WITH CONFIGURATION Debug ===
    The use of Swift 3 @objc inference in Swift 4 mode is deprecated. Please address deprecated @objc inference warnings, test your code with “Use of deprecated Swift 3 @objc inference” logging enabled, and then disable inference by changing the "Swift 3 @objc Inference" build setting to "Default" for the "Runner" target.
    === BUILD TARGET Runner OF PROJECT Runner WITH CONFIGURATION Debug ===
    /Users/michel/Development/Androdev/Flutter/flutter_app/ios/Runner/GeneratedPluginRegistrant.m:6:9: fatal error: 'sqflite/SqflitePlugin.h' file not found
    #import <sqflite/SqflitePlugin.h>
            ^~~~~~~~~~~~~~~~~~~~~~~~~
    1 error generated.
Could not build the application for the simulator.
Error launching application on iPhone X.

I have found some reference to this situation on GitHub, but I don't understand the (rather non-detailed) description of the last poster's solution.

What do I need to do to get sqflite to work (and path_provider)? 

[Mikkel Ravn]

We're tracking this issue in https://github.com/flutter/flutter/issues/15099 which also contains a link to a workaround (manually setting the Target Membership of SqflitePlugin.h to Public in Xcode).

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Mikkel Nygaard Ravn

Software Engineer

[Michel Lesoinne]

I am not even seeing the SqflitePlugin.h file. 

To make sure I didn't miss a step, I did the following:

1. Added sqflite: any  under the dependencies in pubspec.yaml.
2. Ran 'flutter packages get' in the project base directory
3. Did 'open ios/Runner.xcworkspace/'

The Podfile does not contain anything about sqflite, but there is a file ./Pods/Local Podspecs/sqflite.podspec.json

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[Michel Lesoinne]

I am not totally sure that I can reproduce it, but I was able to get around the issue. (and another one that appeared as well) 

I commented out one line in the Podfile:

  #use_frameworks!

Then I also had to force the generated pods to target a version of iOS more recent than 8.0. I modified the last few lines to read:

post_install do |installer|

  installer.pods_project.targets.each do |target|

    target.build_configurations.each do |config|

      config.build_settings['IPHONEOS_DEPLOYMENT_TARGET'] = '9.2' # THIS IS THE LINE I ADDED.

      config.build_settings['ENABLE_BITCODE'] = 'NO'

    end

  end

end