flutter Warning: Podfile is out of date

升级flutter后flutter run的时候提示 flutter Warning: Podfile is out of date

Warning: Podfile is out of date             
  This can cause a mismatched version of Flutter to be embedded in your app, which may result in
  App Store submission rejection or crashes.
  If you have local Podfile edits you would like to keep, see
  https://github.com/flutter/flutter/issues/24641 for instructions.
To regenerate the Podfile, run:
  rm ios/Podfile

解决办法：

rm ios/Podfile
flutter run

执行完flutter run后会重新pod install