You want to add pod 'gRPC-ObjC-ProtoRPC', '0.0.2-dev'
similar to the following to your Podfile:
target 'MyApp' do
pod 'gRPC-ObjC-ProtoRPC', '0.0.2-dev'
end
Then run a pod install
inside your terminal, or from CocoaPods.app.
Alternatively to give it a test run, run the command:
pod try gRPC-ObjC-ProtoRPC