fishhook would call the new function once when I just hook the old one? about fishhook

[kastiglione]

or, iOS system called NSLog?

I think it's probably this. You can set a breakpoint on my_NSLog and look at the stack trace to see which functions/classes/methods led to it being called.

[yehot]

Indeed, as you said, I look at the stack trace and found this:

It's being called by a symbolic breakpoint which added by myself to start a Reveal service:

expr (Class)NSClassFromString(@"IBARevealLoader") == nil ? (void *)dlopen("/Applications/Reveal.app/Contents/SharedSupport/iOS-Libraries/RevealServer.framework/RevealServer", 0x2) : ((void*)0)

After I disable the breakpoint, it's OK.
Thanks a lot !