Using + 7, open the breakpoint editor in Xcode. 
Breakpoints that are on (as indicated by dark blue) or off (as indicated by light blue) can be seen from there (with light blue). 
I'm pretty sure you've got a breakpoint in your method.

The debugger's internal name for the breakpoint is Thread 1: Breakpoint 1.1 (I assume you're reading this from the green bar of text?). 
It doesn't necessarily mean there was a threading error; it's simply indicating where it came to a halt.


To continue, press + + Y, or go to the Debug Menu and select another option.
+ + Y will bring up the Debug area and a bar of buttons that correspond to the actions of the Debug Menu.