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Editorial Team
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Asked: 2026-05-26T17:36:01+00:00

For example, Reachability, _SCNetworkReachabilitySetCallback, referenced from: -[Reachability startNotifer] in xxxxx.a(Reachability.o) I get the error

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For example, “Reachability”, 

  "_SCNetworkReachabilitySetCallback", referenced from:
      -[Reachability startNotifer] in xxxxx.a(Reachability.o)

I get the error like this….I know I just missing import a framework inside this, but how can I check the Reachability is from which framework? How can I know it is from SystemConfiguration?? instead of Google it, does XCode provide any way to find that out? Thx

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1 Answer

  1. Editorial Team

    That’s a linker error, which is solved by linking (as opposed to importing) the framework that exports that symbol. You can easily find out the relevant framework by using the documentation viewer.

    For example, if you open the documentation viewer ⌥⌘?, search for SCNetworkReachabilitySetCallback and open the corresponding documentation page, at the very top of the page you’ll see:

    enter image description here

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