问题
When I call stop on my AVAudioRecorder instance XCode stops at a breakpoint. However, no exception comes up and I don't have my own breakpoint set there. I do have an "All Exceptions" breakpoint setup.
I hit continue and the app runs fine - no message in the console.
What's going on?
回答1:
It is the All Exceptions breakpoint. AV Foundation is throwing an exception and also catching it, so no harm, no foul (which is why the app can resume without a problem) - but you are set to break when that happens, so you do. When the app runs for real (independent of Xcode) no one will know; it's just Xcode and your All Exceptions breakpoint that brings it to the surface.
AV Foundation is full of places like this. I regard it as a bug, but not enough to care very much. I just turn off the breakpoint when working with AV Foundation; otherwise we'd always be stopping...
回答2:
Try 'step in' at method declaration in your code. This should take you to the definition of method being called, and you can 'step over' from there. Hope this may help you.
来源：https://stackoverflow.com/questions/26985725/breakpoint-stops-but-no-exception