Determine what environment your iOS app is running in

BuildConfig.swift

import Foundation

enum AppConfiguration : String {
    case debug = "debug"
    case testFlight = "testFlight"
    case appStore = "appStore"
}

struct Config {
    // This is private because the use of 'appConfiguration' is preferred.
    private static let isTestFlight = Bundle.main.appStoreReceiptURL?.lastPathComponent == "sandboxReceipt"
    
    // This can be used to add debug statements.
    static var isDebug: Bool {
        #if DEBUG
            return true
        #else
            return false
        #endif
    }
    
    static var appConfiguration: AppConfiguration {
        if isDebug {
            return .debug
        } else if isTestFlight {
            return .testFlight
        } else {
            return .appStore
        }
    }
}

//        // Sample usage
//        if Config.appConfiguration != .appStore {
//            // this is a test user
//        }