[Solved] “Reading from public effective user settings” in iOS 10

I’m getting the following messages when launching my app:

2016-10-12 14:47:23.705002 Discovery[377:147958] [MC] System group container for path is /private/var/containers/Shared/SystemGroup/
2016-10-12 14:47:23.712212 Discovery[377:147958] [MC] Reading from public effective user settings.

Is “system group container” related to App Groups? I do share data between apps using an App Group and was wondering if this caused this message to be displayed?

I set the data in one app like this:

var userDefaults = NSUserDefaults(suiteName: "")
userDefaults!.setObject("user12345", forKey: "userId")

And I retrieve it in another app using something like this:

var userDefaults = NSUserDefaults(suiteName: "")
if let testUserId = userDefaults?.objectForKey("userId") as? String {
  print("User Id: (testUserId)")

Did something change in iOS 10 that would cause any problems or cause these messages to show up?

Solution #1:

This is a bug (now we’re finding out it might be a permanent message) and it seems that this message appears primarily when clicking on a Text Field or Text View or other similar NSObject.

This is only a log message and not a compile error message as signified by the date and time preceding the message. Therefore if your code is not working it is not a result of this console message.

If you run on a device the message will be [MC] Reading from public effective user settings. If you run on the sim the message will be [MC] Reading from private effective user settings.

Respondent: TenaciousJay

Solution #2:

  • Go to Xcode -> Product -> Scheme -> Edit Scheme
  • In the Environment Variables, add OS_ACTIVITY_MODE as name and disable as value.


I hope this helps you.

Respondent: Edison

Solution #3:

Xcode seems to full of these confusing and misleading warnings. this warning appears when ever I enter text in a UITextField, at first I thought there is something wrong with my codes.

Respondent: Vinoth Vino

Solution #4:

Is your next output in console like this: [access] <private>. I’ve had your warnings, I was missing permission for camera usage in my plist file Privacy - Camera Usage Description. You need privacy description in plist for which privacy you are using: Contacts, Calendar, Reminders, Photos, Bluetooth Sharing, Microphone, Camera, Location, Health, HomeKit, Media Library, Motion, CallKit, Speech Recognition, SiriKit, TV Provider

Respondent: Tony

Solution #5:

I had this same problem when touching a Bar button that showed an alert, which in turn has a TextField. Any way I solved this matter using the proposal commented in this link. It works at least for me!

Respondent: Flipper

Solution #6:

I was struggling with this issue in an iPhone5 emulator (on the device everything was ok) that stucked my Ionic app after touch a TextInput, and then I changed the emulator to another one, like iPhone6, or iPhone8, and everything worked again.

Respondent: Airel

The answers/resolutions are collected from stackoverflow, are licensed under cc by-sa 2.5 , cc by-sa 3.0 and cc by-sa 4.0 .

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