Advanced Debugging With Xcode and LLDB
- frame variable varaibleName
print out the type of this variable
2. expression variableBool = false
add an break point, add action for this break point, then it will change the variableBool to false
3. add break point for all places that call this function: symbolic breakpoint
4. po $arg1 — — print assembly code
5. breakpoint set — one-shot true — name “-[UILabel setText:]” : break point valid for only once
6. skip the line by dragging the break point to next line or add break point and add action: thread jump — by 1
7.monitor variable by right click on variable name and click watch variable name
8.expression -l objc -O — —[‘self.view’ XXXX] to fix the error that certain type has no member
9. command alias poc expression -l objc -O — —
alias complicate command with easier one
video reference: https://developer.apple.com/videos/play/wwdc2018/412/
What is LLDB?
It’s the debugger of The LLVM Compiler Infrastructure. Here is the homepage and this is a good article about it: Dancing in the Debugger — A Waltz with LLDB.
