Flutter: Permission.location.request() always returns permanentlyDenied.

When testing the Permission on iOS, there is an issue that the permission is aways returns permanentlyDenied.

post_install do |installer|
  installer.pods_project.targets.each do |target|
    flutter_additional_ios_build_settings(target)
target.build_configurations.each do |config|
      # You can remove unused permissions here
      # for more infomation: https://github.com/BaseflowIT/flutter-permission-handler/blob/master/permission_handler/ios/Classes/PermissionHandlerEnums.h
      # e.g. when you don't need camera permission, just add 'PERMISSION_CAMERA=0'
      config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'] ||= [
        '$(inherited)',
## dart: PermissionGroup.calendar
        'PERMISSION_EVENTS=1',
## dart: PermissionGroup.reminders
        'PERMISSION_REMINDERS=1',
## dart: PermissionGroup.contacts
        'PERMISSION_CONTACTS=1',
## dart: PermissionGroup.camera
        'PERMISSION_CAMERA=1',
## dart: PermissionGroup.microphone
        'PERMISSION_MICROPHONE=1',
## dart: PermissionGroup.speech
        'PERMISSION_SPEECH_RECOGNIZER=1',
## dart: PermissionGroup.photos
        'PERMISSION_PHOTOS=1',
## dart: [PermissionGroup.location, PermissionGroup.locationAlways, PermissionGroup.locationWhenInUse]
        'PERMISSION_LOCATION=1',
       
        ## dart: PermissionGroup.notification
        'PERMISSION_NOTIFICATIONS=1',
## dart: PermissionGroup.mediaLibrary
        'PERMISSION_MEDIA_LIBRARY=1',
## dart: PermissionGroup.sensors
        'PERMISSION_SENSORS=1',
## dart: PermissionGroup.bluetooth
        'PERMISSION_BLUETOOTH=1',
## dart: PermissionGroup.appTrackingTransparency
        'PERMISSION_APP_TRACKING_TRANSPARENCY=1',
## dart: PermissionGroup.criticalAlerts
        'PERMISSION_CRITICAL_ALERTS=1',
      ]
end
end
end