Logs not showing on ios

[santervo]

Debug print/loggings are not shown on iOS console, when running on device.

They don't show up when running via flutter run or VSCode.

However logs show when running via XCode, and also in the Dart Devtools.

This happened to me after updating to most recent flutter and Xcode versions.

Steps to Reproduce

1. Create new flutter app
2. Add few print's in the code
3. Run app with flutter run on ios device
4. Logs don't get printed in the terminal.

Target Platform: iOS
Target OS version/browser: Mac OS 10.4.6
Devices: IPad 2018

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, v1.9.1+hotfix.4, on Mac OS X 10.14.6 18G87, locale en-FI)
[✗] Android toolchain - develop for Android devices
    ✗ Unable to locate Android SDK.
      Install Android Studio from: https://developer.android.com/studio/index.html
      On first launch it will assist you in installing the Android SDK components.
      (or visit https://flutter.dev/setup/#android-setup for detailed instructions).
      If the Android SDK has been installed to a custom location, set ANDROID_HOME to that location.
      You may also want to add it to your PATH environment variable.

[✓] Xcode - develop for iOS and macOS (Xcode 11.1)
[!] Android Studio (not installed)
[✓] VS Code (version 1.39.0)
[✓] Connected device (1 available)

[sageata]

I face the same issue on flutter channel dev

[✓] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
• Android SDK at /Users/baloo/Library/Android/sdk
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-28, build-tools 28.0.3
• Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1343-b01)
• All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 11.0)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 11.0, Build version 11A420a
• CocoaPods version 1.8.3

[✓] Android Studio (version 3.4)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin version 36.1.1
• Dart plugin version 183.6270
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1343-b01)

[✓] VS Code (version 1.39.0)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.5.1

[✓] Connected device (1 available)
• Paul’s iPhone • <> • ios • iOS 13.1.1

[ketanm]

@santervo you may get more response on StackOverflow.

In order to print from Flutter app, you do need to write via logger, so all logs will be captured in console. You can use logging package to do it.

[delCatta]

@santervo I'm having the exact same issue on master channel!

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel master, v1.10.15-pre.93, on Mac OS X 10.14.6 18G95, locale en-CL)

[✓] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
[✓] Xcode - develop for iOS and macOS (Xcode 11.0)
[✓] Android Studio (version 3.5)
[✓] VS Code (version 1.38.1)
[✓] Connected device (1 available)

• No issues found!

[prodhe]

Same issues for me.

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, v1.9.1+hotfix.4, on Mac OS X 10.15 19A583, locale en-SE)

[✓] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
[✓] Xcode - develop for iOS and macOS (Xcode 11.0)
[✓] Android Studio (version 3.3)
[✓] VS Code (version 1.34.0)
[✓] Connected device (1 available)

• No issues found!

[delCatta]

Only happens on physical devices! It prints just fine on the Simulator.

[t3o]

Exakt the same here.
iPhone 8 and iPad mini 4 (both v13.1.2) doen't show the print() or printDebug() messages. The output works fine on the emulator (iPhone 11 Pro Max).

[✓] Flutter (Channel beta, v1.10.7, on Mac OS X 10.14.6 18G95, locale de-DE)

[✓] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
[✓] Xcode - develop for iOS and macOS (Xcode 11.1)
[✓] Android Studio (version 3.5)
[✓] VS Code (version 1.39.0)
[✓] Connected device (1 available)

• No issues found!

[ThrowJojo]

I'm having the same issue on stable with physical devices. Simulators are working fine and showing logs though.

[touchfishguo]

Same issue for me.
The devices is iPhone Xr (iOS 13.1.2) which only print the wrong infos in debug mode, but the simulator (iPhone Xr 12.2) works.
If I run by the Xcode it prints all infos.

[✓] Flutter (Channel master, v1.10.15-pre.137, on Mac OS X 10.14.6 18G103, locale
    zh-Hans-CN)
[✗] Android toolchain - develop for Android devices
    ✗ Unable to locate Android SDK.
      Install Android Studio from: https://developer.android.com/studio/index.html
      On first launch it will assist you in installing the Android SDK components.
      (or visit https://flutter.dev/setup/#android-setup for detailed instructions).
      If the Android SDK has been installed to a custom location, set ANDROID_HOME
      to that location.
      You may also want to add it to your PATH environment variable.

[✓] Xcode - develop for iOS and macOS (Xcode 10.2.1)
[!] Android Studio (not installed)
[✓] VS Code (version 1.39.2)
[✓] Connected device (2 available)

[ketanm]

@TojoNozomi - If you do not have a specific reason to use master then I would suggest you to switch to stable branch and try with the latest (v1.9.1+hotfix4) or previous version (v1.9.1+hotfix2) and confirm what is going on.

Also, are you using logging or developer package to log or just print()? (see also - https://flutter.dev/docs/testing/code-debugging#logging)

If you are using correct way to log and still have issues then try to ask on StackOverflow as you may get better support there. People have already asked questions like this - https://stackoverflow.com/questions/49940719/how-to-log-data-to-the-flutter-console

[lgArlequin]

Same here with VS Code, I think the problem started after updating to ios13 on the device.

[✓] Flutter (Channel beta, v1.10.7, on Mac OS X 10.14.6 18G103, locale en-AR)
[✓] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
[✓] Xcode - develop for iOS and macOS (Xcode 11.1)
[✓] Android Studio (version 3.4)
[✓] VS Code (version 1.39.2)
[✓] Connected device (2 available)

[seb-almeida]

Same thing here, I can confirm this started after updating to iOS 13 :

[✓] Flutter (Channel stable, v1.9.1+hotfix.4, on Mac OS X 10.15 19A602, locale en-BR)
 
[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.0)
[✓] Xcode - develop for iOS and macOS (Xcode 11.1)
[!] Android Studio (version 3.5)
    ✗ Flutter plugin not installed; this adds Flutter specific functionality.
    ✗ Dart plugin not installed; this adds Dart specific functionality.
[✓] IntelliJ IDEA Ultimate Edition (version 2019.2.3)
[!] VS Code (version 1.36.1)
    ✗ Flutter extension not installed; install from
      https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter
[✓] Connected device (1 available)

[christopherfujino]

Hi thanks for reporting this! This is a duplicate of #41133, so I will close this issue in favor of that one. Please follow there for updates!