How to find instance by hex in XCode console?

Question

When I bring up console after my iPhone app crashes, it often says \"unrecognized selector sent to instance 0x blah blah blah.\" How can I find out what variable this is?

Answer 1

In gdb you could type

po 0x12345678

to print the -description of the object at that address. But this info is seldom useful. You should instead check the backtrace of the exception first, which can locate the line of code that causes the problem.