Natrium is part of the E-sites iOS Suite.

A pre-build (Swift) script to alter your Xcode project at build-time per environment and build configuration.

TL;DR

With Natrium you can change this:

#if ENVIRONMENT_STAGING
    let apiHost = "mynice.staging-api.com"
    
#elseif ENVIRONMENT_DEVELOPMENT
    let apiHost = "mynice.dev-api.com"
    
#else
    let apiHost = "mynice.api.com"
#endif

Alamofire.request("https://\(apiHost)/items").responseJSON { response in
    // ...
}

Into this:

let apiHost = Natrium.Config.apiHost

Alamofire.request("https://\(apiHost)/items").responseJSON { response in
    // ...
}

🧙‍♂️ With the magic of pre-action run scripts. 😱

"${PROJECT_DIR}/Pods/Natrium/Natrium/natrium" Production

Migration

To v8.x

The location of the binary is changed from (for instance in Cocoapods) Pods/Natrium/bin/natrium to Pods/Natrium/Natrium/natrium
The location of the generated Natrium.swift is changed to (for instance in Cocoapods): Pods/Natrium/Natrium/Natrium.swift

To v7.x

natrium install is removed
Both .natrium-env and .env files can be used for environment variables
CLI no longer needs --project argument
No longer supports Objective-c, use v6.4.0 if you still need it.

To v6.x

For Natrium v6.x you need to manually import the Natrium.swift file to your project to make it work in the new xcode build system. Read the Installation guide.

From v5.x

Natrium v5.x doesn't need a build phase script anymore.
Open your Build Phases from your target settings and remove the [Natrium] check step.

Else your build will fail during the script steps

Roadmap

Swift 4.2 compatible
Use swift instead of ruby
Remove ImageMagick dependency
Unit tests
Different installation options (apart from CocoaPods)
Better error handling / reporting

Installation

Swift Package Manager → Read the instructions here.
CocoaPods → Read the instructions here.
Carthage → Read the instructions here.
Manually → Read the instructions here.
XcodeGen → Read the instructions here.

Implementation

Swift

Just add Natrium.swift (from the designated location, see installation guide) to your project's target (do not copy).

Configuration

Configuration documentation can be found here.

Usage

The example .natrium.yml as shown above, will result in the following Config.swift file:

import Foundation

/// Natrium.swift
/// Autogenerated by natrium
///
/// - see: https://github.com/e-sites/Natrium

enum Natrium {

    enum Environment: String {
        case staging = "Staging"
        case production = "Production"
    }

    enum Configuration: String {
        case debug = "Debug"
        case release = "Release"
        case adhoc = "Adhoc"
    }

    enum Config {
        static let environment: Natrium.Environment = .staging
        static let configuration: Natrium.Configuration = .debug
        static let testVariableDouble: Double = 1.0
        static let testVariableString: String = "debugString"
        static let testVariableBoolean: Bool = false
        static let testVariableInteger: Int = 125
        static let testArray: [String] = [ "StagingFoo", "StagingBar" ]
    }
}

It can be used like so:

class MainViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()

        print("bundle identifier: \(Bundle.main.bundleIdentifier!)")
        print("environment: \(Natrium.Config.environment)")
    }
}

Result:

bundle identifier: com.esites.app.staging
environment: Staging

Development

Run

make xcodeproj

and open Natrium.xcodeproj

Advanced

Logging

In the Pods/Natrium/bin/ folder you can find natrium.log with the logs of the previous build. It might help you with debugging.

Environment variables

If you place .env in the root of your project. Natrium will use that fill to add environment variables to your already existing environment variables. The .env file should have to following format:

KEY=VALUE

for instance:

PRODUCTION_SECRET_API_TOKEN=3489uierhjkfbnvcx
STAGING_SECRET_API_TOKEN=iujk9qijs41

This way you can use #env(PRODUCTION_SECRET_API_TOKEN) in your .natrium.yml file.

For CI/CD pipelines you can simply add those environment variables to your build pipeline (in travis or buddybuild for instance).

But if you want to use it for local (debug) builds, this file can be helpful.
⚠️ Don't forget to add .env to your .gitignore