问题
I am creating an iPhone application, and I am using RestKit api to connect to the server. I am facing a problem whenever I add the Reachability.m and Reachability.h into the second UIViewController of the project. I tried making a new .m file in Xcode4 and now I get an Apple macho-linker (id) error on all tabst. I added it to the first UIViewcontroller it works normally, but when I try to add it to any other forms I receive this error.
回答1:
Have you added the SystemsConfigurations.Framework to your project? Apples reachability package requires the SystemConfigurations.Framework to be added before it can be used.
Also if you are using ARC (Automatic ReferenceCounting), ensure you have disabled ARC for that particular file. Do this by going to build phases, compile sources, then double clicking Reachability.m and entering -fno-objc-arc to disable ARC
回答2:
Solved it by importing ONLY "Reachability.h" not "Reachability.h" and "Reachability.m"
回答3:
Try adding CFNetwork.framework.
来源：https://stackoverflow.com/questions/12620271/reachability-h-reachability-m-gives-an-apple-mach-o-linker-error-while-adding