SimpleToDo

SimpleToDo

SimpleToDo is a to do list tracker written in SwiftUI, saving data using Codable.

Understanding the code

All the data is accessed using the ViewModel class, which is created inside SimpleToDoApp and shared everywhere. This class is responsible for loading and saving the data using Codable and the app’s documents directory, and also adding and deleting data while the app is running.

Things to watch out for:

• ItemRow, and DetailView are both created using bindings to the shared ViewModel, meaning that any change the user makes is automatically stored in the view model and written out to disk.
• The main NavigationView uses SelectSomethingView to have something to display in the detail area of the view where applicable – a Max-sized iPhone in landscape, for example.
• ContentView tracks its own EditMode property rather than using the one from the environment, because it makes for simpler code. This edit mode is used to determine whether to show a trash toolbar icon or not.
• Data in ViewModel is automatically saved after 5 seconds of not being changed, or if the user exits the app.

Credits

SimpleToDo was made by Paul Hudson as part of the Simple SwiftUI project. It’s available under the MIT license, which permits commercial use, modification, distribution, and private use.