How to display debugger message when in wait for executable to be launched

Hi, I am trying to debug when user is receiving remote notitifcation and I would like to debug the code in app delegate file with the mode of wait for executable to be launched. I did not see any debugger message or print message in the console. I have an extra target which is Notification Service extension, just to provide as many information as I can. Please help. thank you!

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Xcode can only see printed output if it launched your program; if your program was launched by the system and then Xcode attached after the fact, it can’t see such output.

When debugging problems like this your best option is to:

  • Log with a dedicated logging API

  • View your log entries using the Mac’s Console app

With regards APIs, your best option is the unified logging system (

<os/log.h>
in C-based languages, 
os.log
in Swift). This allows you to tag your log entries so that you can more easily find them in Console. It also helps with in-the-field debugging because your log entries are captured by a sysdiagnose logs.

You can learn more about unified logging in WWDC 2016 Session 721 Unified Logging and Activity Tracing.

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Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware 

let myEmail = "eskimo" + "1" + "@apple.com"
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