Useful Xcode debugger commands

Useful Xcode debugger commands.md

Useful Xcode debugger commands

Command	Description	Example
Value Inspection
po	Print the value of an expression	po myVariable.count
po [object description]	Print a detailed description of the object.	po [myView debugDescription]
ptype	Print the type of an expression	ptype myArray
quick look	Display a visual preview of an object in the debug pane
kvc path: "<key path>"	Access nested properties using Key-Value Coding from the current context	kvc path: "user.profile.name"
print	Print a message to the console	print("My code reached here!")
Execution Control
continue	Continue execution after a breakpoint
next	Step to the next line of code
step	Step into the next line of code, even if it's a function call
skip	Skip the current line of code
return	Return from the current function
Breakpoints and Watchpoints
break	Set a breakpoint at the current line of code
breakpoint delete <breakpoint number>	Delete a specific breakpoint	breakpoint delete 1
condition break [breakpoint number] <condition>	Set a condition for a breakpoint to trigger	condition break 1 myVariable.isEmpty
watchpoint set expr at`	Set a watchpoint on an expression.	watchpoint set expr myInt == 10 at [MyViewController viewDidLoad]
data breakpoint set at [memory address]	Set a breakpoint on a memory address	data breakpoint set at 0x12345678
Information and Navigation
bt	Print the call stack
clear	Clear the console output
help	Get help on available debugger commands	help po
info	Get information about the current state of the debugger	info breakpoints
thread list	List all available threads
thread select <thread number>	Switch to a specific thread	thread select 2
source file [filename]	View the source code for a specific file	source file MyViewController.swift
Path and URL
po NSHomeDirectory()	Print the user's home directory path	po NSHomeDirectory()
po Bundle.main.bundleURL	Print the URL of the app's main bundle
po NSBundle.mainBundle.bundlePath	Print the path of the app's main bundle
po UIApplication.shared.applicationState	Print the current application state (Active, Background, etc.)
po NSBundle.mainBundle.executablePath	Print the current application location (if available)
Memory
po <memory address>	Print the value at a specific memory address (Careful with raw memory access!)	po 0x12345678
memory read <count> at <address>	Read a specific number of bytes from memory at a given address	memory read 4 at 0x12345678
po CFGetAddressOfObject(<object>)	Print the memory address of an object	po CFGetAddressOfObject(myView)
Advanced Access
po <class>.description	Print a detailed description of an object's class	po UIViewController.description
po NSClassFromString("<class name>")	Access a class dynamically using its string name	po NSClassFromString("MyCustomViewController")
po <array>[<index>]	Access an element in an array by its index	po myArray[2]
po <dictionary>["<key>"]	Access a value in a dictionary by its key	po myDictionary["username"]
po <closure>(<arguments>)	Execute a closure directly in the debugger	po myClosure(1, "string")
po ProcessInfo().processIdentifier	Print the current process identifier (PID)	po ProcessInfo().processIdentifier
po task(forPID: <PID>)	Access a specific running process by its PID	po task(forPID: ProcessInfo().processIdentifier)