Modifying Settings app with LLDB

modifying_settings_app_with_lldb

# Launch the simulator
open /Applications/Xcode.app/Contents/Developer/Applications/Simulator.app

# Get the identifier of the running simulator
sim_id=$(xcrun simctl list | grep Booted | cut -d ' ' -f7 | sed -e 's/(//' -e 's/)//')

# Launch the Preferences app
xcrun simctl launch $sim_id com.apple.Preferences

# Attach LLDB to the process
lldb -n Preferences

# Set a breakpoint
br set -n  "-[UILabel setText:]" -C 'po $rdx = (unsigned long)[NSString stringWithFormat: @"%@ - %@", (NSString *)$rdx, @"Omar"]' -G1

# How it works:
# -n  "-[UILabel setText:]" -> Sets the symbol name that will trigger the breakpoint.
# -C 'po $rdx = (unsigned long)[NSString stringWithFormat: @"%@ - %@", (NSString *)$rdx, @"Omar"]' -> When the breakpoint is triggered,
# it will modify the rdx register (which corresponds to the argument that is received in the function) to the address of the new string.
# -G1 -> Tells the breakpoint to auto continue.

# Continue the process
continue

# When you're done, detach from the process and exit LLDB ;)
detach
exit