Swift: Oslog/Os_Log Not Showing Up in Console App

Swift macOS App - Enable Info/Debug Logging in Apple Console App

I faced the same problem. Info and debug level messages must be activated in the Console application: Console > Action > Include Info Messages and Include Debug Messages.

Take a look at Apple documentation at Include info or debug messages.

Viewing os_log messages in device console

The "Devices and Simulators" window only shows crash reports. Use the Console app or Terminal, via the log --stream command, to see live log output.

To see the device's live log messages via the Console app, either when running from Xcode or when running from the device directly:

• Open Console.app.
• Click on the device's name in the left side panel, under "Devices".
• Select Action, then Include Info Messages from the menu. If you are also using .debug level messages, make sure to select Include Debug Messages as well. (Without those items selected, the Console displays .default, .fault, and .error level messages only.)

If you still don't see the messages, try entering this Terminal command to configure the logging levels for your app:

sudo log config --subsystem com.test.testapp --mode level:debug

This turns on .debug-level logging for subsystem "com.test.testapp" (which includes .info and .default messages).

If you want to persist the messages, rather than the default of memory-only, turn on persistence for the three levels at the same time, like so:

sudo log config --subsystem com.test.testapp --mode level:debug,persist:debug

Regardless of any log settings, though, only crash reports will appear in the "Devices and Simulators" window.

os.Logger (os_log) ignores the new privacy string interpolation

You are doing this with the simulator. It only applies when running on a physical device.

Also, the device must not be attached to the debugger.

E.g. here is the console when I watch it while connected to debugger:

When you run this code on a physical device while not connected to the debugger and watch on the macOS console, you will see:

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