print() statement not printing to console in flutter iOS app within Android Studio

Question

The print() statement is not printing any data within Android Studio's console in Flutter iOS version, but same code works fine for flutter android version.

Here is the flutter Doctor summary:

[✓] Flutter (Channel master, v1.10.7-pre.109, on Mac OS X 10.14.6 18G103, locale en-IN)

[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
[✓] Xcode - develop for iOS and macOS (Xcode 11.0)
[✓] Android Studio (version 3.5)
[✓] IntelliJ IDEA Community Edition (version 2019.1)
[✓] Connected device (1 available)

• No issues found!

that is a typo, I'm facing the issue with print() statement only. It is not working when in run the flutter app in iOS. — Aravinth thiyagarajan, Oct 02 '19 at 12:47
@FernandoRocha, Not to any specific piece of code, even for a simple print('Hello!') statement within the main function of the sample flutter app has this issue in physical iOS devices. — Aravinth thiyagarajan, Oct 03 '19 at 07:47
did you check and see if it prints at xcode console? since its the iOS version — Fernando Rocha, Oct 03 '19 at 12:22
This is a known issue with the current version of flutter because of the way that iOS 13.0 works on apple devices. You're options are to use a simulator and not a physical device, or move over to the beta channel. — RhysD, Oct 14 '19 at 09:07
@R.Duggan have you got a link to further information or discussion about the problem with iOS 13? — Matt R, Nov 01 '19 at 14:42

score 41 · Answer 1 · answered Oct 26 '19 at 21:03

41

I had the same issue. What worked for me was to add

import 'dart:developer';

to the top of my file, and then use

log('your message here');

instead of print.

answered Oct 26 '19 at 21:03

Bianco

531
3
4

we can only use logs with Strings.. but I want to log double any solution? – Chirag Chopra May 12 '20 at 04:15
Interesting find here. Should these statements be commented in production build or they are automatically ignored? – Damandroid Jan 15 '21 at 21:14
1

@ChiragChopra use interpolation like this `log("$my_double_var")` – Tryliom Feb 24 '21 at 14:20

score 10 · Answer 2 · answered Oct 02 '19 at 14:39

10

you should try

debugPrint("")

to print in the console

answered Oct 02 '19 at 14:39

Mo Ok

544
6
20

score 10 · Answer 3 · edited May 16 '22 at 11:57

10

had same issue... embarrassing said that I had my debug console filtered without realize it .. after I remove the filter text I could see all my print() and log()

edited May 16 '22 at 11:57

saurabh

6,687
7
42
63

answered Oct 12 '21 at 03:19

Claudio Moscoso

329
3
5

that was me lol – gogobebe2 Nov 02 '22 at 13:44
@Claudio Moscoso Can you explain remove 'filter text' where? Tnx – Pointer Aug 29 '23 at 08:07

score 4 · Answer 4 · answered Oct 21 '19 at 14:37

4

I got the same issue.

As a workaround:

Select 'more actions' in the console, 'Open observatory' and the 'see debug' link. Then you can see the outputs of the print statements.

answered Oct 21 '19 at 14:37

Marcel Verhagen

39
2

It is weird that it is happening after I updated it today. Your workaround helps, but I can't use vscode – carlosx2 Oct 23 '19 at 17:07

score 3 · Answer 5 · answered Dec 13 '19 at 13:43

3

We stumbled upon it today and apparently the first line of some loggings doesn't appear. So if you start with a \n before your loggings it should work.

os_log("\n  We're using this")

answered Dec 13 '19 at 13:43

Julian Horst

805
8
15

it worked for me `flutter 2.0.2`, flutter ios has very strange bugs like these lol – cs guy Mar 22 '21 at 23:25

score 1 · Answer 6 · answered Nov 17 '19 at 20:09

1

In my case this happened because I changed the display name in Xcode from Runner to something else. Everything was working fine, but there was no log output.

answered Nov 17 '19 at 20:09

TimSim

3,936
7
46
83

score 0 · Answer 7 · answered May 05 '20 at 14:24

0

On pubspec.yaml change:

environment:
  sdk: ">=2.1.0 <3.0.0"

TO

environment:
  sdk: ">=2.6.0 <3.0.0"

Or high!

To more information visit Dart Diagnostic

answered May 05 '20 at 14:24

Antonio Ubirajara C. Oliveira

36
4

score 0 · Answer 8 · answered Mar 08 '22 at 14:15

For

[✓] Flutter (Channel stable, 2.10.3, on macOS 12.2 21D49 darwin-x64, locale en-NG)
    • Flutter version 2.10.3 at /Users/theodore_mca/softwares_and_sdks/flutter2
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 7e9793dee1 (6 days ago), 2022-03-02 11:23:12 -0600
    • Engine revision bd539267b4
    • Dart version 2.16.1
    • DevTools version 2.9.2

Or Later

import 'dart:developer';

log("Theodore");

For regular strings

import 'dart:developer';

  final Map<String, dynamic> value = {"email2":'_emailController.text',};
  value.addAll({
              "email":'_emailController.text',
               "username":'_usernameController.text'});
  
  log(value.toString());

For complex Data Type

print() statement not printing to console in flutter iOS app within Android Studio

8 Answers8

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