Today I add the Reachability classes to an app I am working on, added my #import Reachability.h to the correct files and then implemented a method to check if the device was using wifi.
When I hit build, I got the following error.
Undefined symbols for architecture i386: "_SCNetworkReachabilityCreateWithAddress", referenced from: +[Reachability reachabilityWithAddress:] in Reachability.o "_SCNetworkReachabilityCreateWithName", referenced from: +[Reachability reachabilityWithHostName:] in Reachability.o "_SCNetworkReachabilityGetFlags", referenced from: -[Reachability connectionRequired] in Reachability.o -[Reachability currentReachabilityStatus] in Reachability.o "_SCNetworkReachabilityScheduleWithRunLoop", referenced from: -[Reachability startNotifier] in Reachability.o "_SCNetworkReachabilitySetCallback", referenced from: -[Reachability startNotifier] in Reachability.o "_SCNetworkReachabilityUnscheduleFromRunLoop", referenced from: -[Reachability stopNotifier] in Reachability.o ld: symbol(s) not found for architecture i386 clang: error: linker command failed with exit code 1 (use -v to see invocation)
I figured it was a framework that I had forgotten to add to I added the CFNetwork.framework and hit build again, same error again. I then added SystemConfiguration.framework into the project and hit build, and success!!
It was such a simple fix but the errors that were displayed weren’t really helpful with explaining what framework needed to be added.