Choose Your Own Adventure with Environment Variables
We fixed a performance bug and verified behavior with our generated test data, but we don’t want to have to manually change the Objective-C code when we want to choose a data scenario. Instead we’ll choose which message to send to the data factory on the fly during application launch based on an environment-variable value.
Every Unix process, including iOS and OS X apps, has a set of variables made visible through that process’s environment. We can assign any string value we want to these environment variables through Xcode schemes, as we’ll see in a moment, and even from the command line, which we’ll use in Chapter 10, Command-Line Workflow.
Rather than hard-code the call to generate ...
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