xcode - Programming stop execute in iOS when debug? -

want build debug tool monitor app, pause execution when bad things occur. dev can continue run program after notified problem.

may throw exception or use special signal?

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i have tried raise(sigstop), looks good. backtrace showed in xcode not stop it. can make real time stop?

if fatal error comes, terminates itself. if want

1) break code execution: use breakpoints:

http://jeffreysambells.com/2014/01/14/using-breakpoints-in-xcode

2) log output:

• use nslog() objective-c
• use print() swift

swift: print() vs println() vs nslog()