How do I find out what exception was thrown in the Xcode debugger (for iPhone)?

Question

I\'m learning iPhone programming from Erica Sadun\'s The iPhone Developer\'s Cookbook. When I run the app I created by following the steps in the Temperature Conversion Exa

Answer 1

http://ijoshsmith.com/2011/11/28/debugging-exceptions-in-xcode-4-2/

Same as samewize's solution, but also shows how to make this breakpoint show up by default in all your projects (right click on breakpoint, Move Breakpoint To, User).