There are many instances where you would need to support multiple configurations within your iOS app beyond the standard debug and release project configuration. Let’s suppose you app needs to talk to different server deployments – Development, QA and Production. In this case , you would want your app targeted for a specific environment to be configured to talk to the appropriate server deployment. This blog post describes how you can do that within your swift iOS app. Things are slightly different with Obj-C, where you could define preprocessor flags within your .xcconfig files created for each environment . But with limited support for macros in swift, we will follow a slightly different approach
Step 1: Create desired configurations for Dev, QA and Prod
- Under Project-Demo , add new configurations based upon existing Debug and Release configurations.
- Duplicate the Debug configuration as a “Dev” configuration and duplicate the Release configuration as “QA” and “Prod” configurations .
- Delete the Debug and Release configuration
Step 2: Add new schemes for Dev, QA and Prod configurations
Step 3: Make sure that the schemes created in Step 2 are “visible”
Step 4: Edit schemes created in Step2 and associate it with the appropriate configuration
So associate the QA scheme with QA configuration , the Dev scheme with Dev configuration and the Prod scheme with Prod configuration. 
Step 5: Add a new user-defined build setting under Build Settings under tab.
This setting has a different value for each of the configurations. 
Step 6: Add a info.plist property corresponding to the user-defined setting
Step 7: In your app, read the info.plist property
That's it. Take appropriate actions depending on the configuration setting.
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func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool { // Override point for customization after application launch. let deployName = Bundle.main.object(forInfoDictionaryKey: "Deployment") as! String switch deployName { case "DEV": print ("Dev Deployment. Connect to Dev server") case "QA": print ("QA Deployment. Connect to Dev server") case "PROD": print ("Prod Deployment. Connect to Dev server") default: print("Unsupported") } return true } |
A demo project can be downloaded from here.