Programming stop execute in iOS when debug?

Question

Want to build a debug tool to monitor the app, pause execution when bad things occur. Dev can continue run the program after be notified the problem.

May I just throw a exception or use a special signal?

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I have tried raise(SIGSTOP), looks good. But the backtrace showed in Xcode is not exactly what I stop it. Can I make a real time stop?

Answer 1

If fatal error comes, it terminates by itself. If you want to

1) break code execution: Use breakpoints:

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

2) log output:

• use NSLog() for Objective-C
• use print() for Swift

Swift: print() vs println() vs NSLog()

Answer 2

Call a NOP method. In Xcode, put a symbolic breakpoint on that method.