Agregar ToDos (Parte 1)

The MVVM architecture is a robust approach to building applications by providing an organized schema, similar to building a house. In this context, the view model is the backbone that integrates key functionalities, such as adding tasks to local storage using Core Data. This process involves defining essential parameters such as the title, an optional note, and the creation date, assigning these values to a corresponding entity with a unique identifier.

What steps do we follow to implement addTodo in the view model?

The addTodo function in the view model plays a crucial role because of its ability to add new tasks to the storage. Here are the fundamental steps:

1. Parameter definition: It starts by receiving atitle (title), an optional note(note), and the creation date(date).
2. Entity creation: A new instance of the entity, newTodo, is initialized and associated to the Core Data context.
3. Value assignment: The unique identifier, title, note and date are assigned to newTodo.
4. Default status: When a new task is created, it is set by default to be neither completed nor archived.
5. Data persistence: Finally, the saveData function is invoked to ensure persistence in local storage.

func addTodo(withTitle title: String, note: String?, date: Date) { let newTodo = TodoEntity(context: storeContainer.viewContext) newTodo.id = UUID() newTodo.title = title newTodo.note = note newTodo.date = date newTodo.isComplete = false newTodo.isArchive = false saveData() }

How are visual elements handled in the view?

The view, represented by todoAddView, is where user interactions are materialized, from entering titles to selecting dates. Its design should be intuitive and functional to enhance the user experience.

How are variables declared in the view?

When declaring variables, notations are used to enable smooth and efficient state management:

1. ViewModel injection: using the @Environment notation, functionalities such as adding tasks are accessed.

   @Environment(viewModel) var viewModel: TodoViewModel

2. State variables: @State notations are used to dynamically manage the title, note, and creation date.

   @State private var title: String = "" @State private var note: String = "" @State private var date: Date = Date()

What visual elements make up the interface?

The visual design must be consistent and easy to use. Below are the main elements:

• TextBoxes: Using TodoTextInput, input is provided for the title, which is mandatory, and notes, which are optional.
• DatePicker: Through DatePicker, users can select the desired date and time.

VStack { TodoTextInput("Enter task name", text: $title, label: "Task") TodoTextInput("Type a description of the task", text: $note, label: "Note") DatePicker("Date and time", selection: $date, in: dateRange, displayedComponents: [.date, .hourAndMinute]) }

In the mobile environment, these visual controls ensure that data entry is straightforward and efficient. Developers can customize these components to further enhance usability.

Tips to maximize the functionality of your application

1. State maintenance: Implement the use of reactive states to ensure that interface changes are automatically reflected.
2. Unique identifiers: Use UUIDs to avoid storage conflicts by having unique identifiers for each entity.
3. User-friendly interface: Ensure that the interaction with the application is as intuitive as possible for the end user.

Ultimately, building an application with MVVM architecture provides a robust structure, and through this approach we can effectively manage logic and storage, paving the way for future enhancements and functionality.