A lightweight service-oriented ApplicationDelegate for iOS, made in Swift. Based on the Fernando Martín Ortiz's idea (his repo not supported now).

AppDelegate is a traditional example of bad code. Lots of lines of code that makes so much different things are put together in methods that are called within the application life cycle. But all of those concerns are over.

Using PluggableAppDelegate you separate AppDelegate from the services that you can plug to it. Each ApplicationService has its own life cycle that is shared with AppDelegate.

• iOS 9.0+
• Xcode 10.2+
• Swift 5.0

Here is how a ApplicationService is like:

import Foundation

import PluggableAppDelegate

final class LoggerApplicationService: NSObject, ApplicationService {

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey : Any]? = nil) -> Bool {
        print("🎉 LoggerApplicationService has started!")
        return true
    }

    func applicationDidEnterBackground(_ application: UIApplication) {
        print("🙀 LoggerApplicationService has entered background")
    }

    func applicationWillEnterForeground(_ application: UIApplication) {
        print("😻 LoggerApplicationService has entered foreground")
    }
}

That's all. It is exactly the same as a AppDelegate. Think of ApplicationService as sub-AppDelegates.

In AppDelegate you just have to inherit from PluggableApplicationDelegate to register the services.

import UIKit

import PluggableAppDelegate

@UIApplicationMain
class AppDelegate: PluggableApplicationDelegate {

    override var services: [ApplicationService] {
        return [
            RootVCApplicationService(),
            LoggerApplicationService()
        ]
    }
}

You can use CocoaPods.

platform :ios, '9.0'
use_frameworks!

target 'MyApp' do
  pod 'PluggableAppDelegate'
end

You can use Carthage. Specify in Cartfile:

github "pchelnikov/PluggableAppDelegate"

Run carthage to build the framework and drag the built MarkerKit.framework into your Xcode project. Follow build instructions.

• If you found a bug, open an issue
• If you have a feature request, create pull request

Michael Pchelnikov

You can follow me on Twitter at @pchelnikov

Fernando Martín Ortiz

PluggableAppDelegate is available under the MIT license. See the LICENSE file for more info.