Summary of flutter problems

Catalog

1.Error: Cannot run with sound null safety, because the following dependencies don't support null safety:

2. Used webview_flutter after flutter  run Problems arise ：warning: The iOS Simulator deployment target 'IPHONEOS_DEPLOYMENT_TARGET'    is set to 8.0, but the range of supported deployment target versions is 9.0 to 14.5.99. (in target 'Flutter' from project 'Pods')

3. Local operation spanning

Mode one ：Flutter/packages/flutter_tools/lib/src/web/chrome.dart Add ‘--disable-web-security’

And then run flutter doctor, And then restart the project

---

run：
flutter run --no-sound-null-safety

build：
flutter build apk --no-sound-null-safety

2. Used webview_flutter after flutter  run Problems arise ：warning: The iOS Simulator deployment target 'IPHONEOS_DEPLOYMENT_TARGET'
    is set to 8.0, but the range of supported deployment target versions is 9.0 to 14.5.99. (in target 'Flutter' from project 'Pods')

 stay flutter Project ios In the directory Podfile file , Replace at bottom post_install..... The content is 
post_install do |installer|
  installer.pods_project.targets.each do |target|
    target.build_configurations.each do |config|
      if config.build_settings['IPHONEOS_DEPLOYMENT_TARGET'].to_f < 9.0
        config.build_settings['IPHONEOS_DEPLOYMENT_TARGET'] = '9.0'
      end
    end
  end
end


 then cd To ios Under the table of contents , perform Pod install, Then a prompt message appears 
[!] 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`.

[!] CocoaPods did not set the base configuration of your project because your project already has a custom config set. In order for CocoaPods integration to work at all, please either set the base configurations of the target `Runner` to `Target Support Files/Pods-Runner/Pods-Runner.profile.xcconfig` or include the `Target Support Files/Pods-Runner/Pods-Runner.profile.xcconfig` in your build configuration (`Flutter/Release.xcconfig`).

 Solve the first one ！ problem . open PodFile, Release comments platform :ios, '9.0'

 Solve the second ！ problem . open Flutter/Release.xcconfig , add to 
#include "Target Support Files/Pods-Runner/Pods-Runner.profile.xcconfig"
 Then run... Again pod install

 Then something went wrong , And found that dart SDK The version number is too low , My upgrade method is to download the new version flutter Replace the old version folder .

3. Local operation spanning

Mode one ：Flutter/packages/flutter_tools/lib/src/web/chrome.dart Add ‘--disable-web-security’

   '--disable-web-security',
      if (headless)
        ...<String>[
          '--headless',
          '--disable-gpu',
          '--no-sandbox',
          '--window-size=2400,1800',
        ],

 

  Then delete flutter\bin\cache Under the flutter_tools.snapshot Document and flutter_tools.stamp file .

And then run flutter doctor, And then restart the project

Mode two ：

flutter run --no-sound-null-safety -d chrome  --web-renderer html