Attach to process

Press ⌃ ⌥ F5 or choose Run | Attach to Process from the main menu.

AppCode will show the list of the running local processes. Select the process to attach to.

If necessary, narrow down the list of processes by typing the first letters of its name or PID.

Proceed with debugging the same way as you usually do it in AppCode (set breakpoints, step through, pause and resume the process, evaluate expressions, and so on)

Note that in case the process you have attached to does not provide debug information, breakpoints will be unavailable and stepping will be performed in the disassembly view.