Seems like the stuff that people are doing in C++ doesn’t quite work for iOS. For example, I tried:
for (const auto& params : module.parameters()) {
          std::cout << params.values() << std::endl;
}

which yields:
values not implemented for TensorTypeSet(VariableTensorId, CPUTensorId) (values at /Users/distiller/project/build_ios/aten/src/ATen/core/TensorMethods.h:3534) (no backtrace available)