iOS Debug-lldb

Lldb is the debugger under LLVM. Xcode starts with the 4.0 compiler instead of LLVM, and the corresponding debugger changes from GDB to Lldb. Starting with Xcode5.0, all projects are automatically set to use Lldb.

Record some of the commands that are commonly used in lldb, for example, when the code is running and the program crashes

1. View the address information, you can find the number of lines of error code, suspected 0x00001b91 This memory address error

Image Lookup--address 0x00001b91

2. Inheritance relationship of Output view

PO [[Self view] recursivedescription]

3. Print the control's frame

4. Error may be returned when using NSLog to output control information, the return value needs to be added before

The modified command