Why will not my XCODE DEBUG total stop at the breakpoint, is not what is not set?

Why will not my XCODE DEBUG total stop at the breakpoint, is not what is not set?
Reply:
In what way you run ah? Run or debug run ah? VS on and about the same, if the direct CTRL + F5 if not stop at the breakpoint.
Reply:
First make sure there is no running from where you set the breakpoint.
Plus NSLog () to see.
Reply:
If it is a PC MAC system installed.
Problem because the system kernel may result DEBUG invalid.
Reply:
Oh, no, because the kernel of reasons, my PC is also INTEL, ah

Reply:
Determine the breakpoint lay?
If you play well, and that is bug, experienced, restart xcode or machine on the line.