使用package:http/http.dart在iOS模拟器上出现Flutter崩溃问题

Hey there, let's work through this crash you're hitting with Flutter beta 0.15 on your iPhone X (11.2) simulator. That NoSuchMethodError about stdout being null usually ties to initialization issues in the Flutter toolchain, especially since you're using an older beta build. Here are the steps to fix it:

• Upgrade to a newer Flutter Beta version
  Flutter beta 0.15 is pretty outdated, and many initialization bugs (including this stdout null issue) have been patched in later releases. Run these commands to update:

  flutter channel beta
  flutter upgrade
  

• Clean Flutter's build cache
  Stale build artifacts can cause weird initialization glitches. Clear them out and rebuild:

  flutter clean
  flutter run
  

• Restart your iOS Simulator
  Sometimes the simulator itself gets into a wonky state that messes with Flutter's IO setup. Try:

  • Go to the simulator's menu bar → Hardware → Restart
  • Or fully quit the simulator, wait 10 seconds, then launch it again before running your app

• Validate your Flutter environment with flutter doctor
  Run this command to check for any missing dependencies or misconfigurations in your setup:

  flutter doctor
  

  Fix all the issues it flags (like missing Xcode components, outdated tools, etc.)—even small discrepancies can trigger unexpected crashes.

• Test with a fresh Flutter project
  If the above steps don't work, create a new default Flutter project and run it on the same simulator. If the new project works, the problem is likely in your existing project's configuration (e.g., corrupted files in the ios/Runner directory). Compare the new project's setup to yours to spot and fix the differences.

Why this happens #

In older Flutter beta builds, the toolchain sometimes failed to properly initialize the stdout object when running on certain iOS simulator versions. This was often due to race conditions during app startup or mismatches between the Flutter SDK and simulator runtime. Upgrading or cleaning up your environment usually resolves these low-level initialization bugs.

内容的提问来源于stack exchange，提问作者JItesh SUvarna