Delegation and Core Location - iOS Programming: The Big Nerd Ranch Guide - page 140

Diagnosing crashes and exceptions
While you can set breakpoints yourself to break on a particular line, it would be nice if the
debugger would automatically set a breakpoint on any line that causes your application to
crash or that causes an exception to be thrown.
To get the debugger to do this, we need to add a breakpoint for all exceptions. Select the
debug navigator. Then, at the bottom of the navigator area, click the + icon and select Add
Exception Breakpoint... . Then, click the Done button on the panel that pops up ( Fig-
ure 4.13 ) .
Figure 4.13 Turning on exception breakpoints