iOS app state restoration demo

Example project that shows how to implement state restoration in iOS app that does not use storyboards.

Requirements:

• Xcode 10.2.1
• SwiftLint

1. Open StateRestoration.xcodeproj.
2. Build and run StateRestorationApp scheme in iOS simulator.
3. Play with the app a bit, change stepper value, push new view controllers etc.
4. Kick the app to background (press ⇧ + ⌘ + H) to save current state.
5. Stop running the app in Xcode.
6. Start the app again (from Xcode or directly in simulator).
7. Previous state should be restored.

• Selected tab
• Navigation controllers stack
• View controllers titles
• Stepper values

• UITabBarController and UINavigationController manages state restoration without the need to add any code, apart from setting restorationIdentifier property on each of them.
• UIViewController subclasses need to implement several methods from UIViewControllerRestoration and UIStateRestoring protocols to save and restore their state.
• The saved state is removed if you "kill" the app from iOS task switcher.

Copyright © 2019 Dariusz Rybicki Darrarski

License: GNU GPLv3