Here is an example of a simple to-do list app in SwiftUI where users can add, remove, and mark tasks as completed. This example introduces list management and the List view:

import SwiftUI

struct Task: Identifiable {
    let id = UUID()
    var title: String
    var isCompleted: Bool
}

struct TodoListView: View {
    @State private var tasks = [Task]()
    @State private var newTaskTitle = ""
    
    var body: some View {
        NavigationView {
            VStack {
                HStack {
                    TextField("New Task", text: $newTaskTitle)
                        .textFieldStyle(RoundedBorderTextFieldStyle())
                        .padding(.horizontal)
                    
                    Button(action: {
                        addTask()
                    }) {
                        Text("Add")
                            .padding(.horizontal)
                            .padding(.vertical, 8)
                            .background(Color.blue)
                            .foregroundColor(.white)
                            .cornerRadius(8)
                    }
                }
                .padding()
                
                List {
                    ForEach(tasks) { task in
                        HStack {
                            Text(task.title)
                            Spacer()
                            Button(action: {
                                toggleTaskCompletion(task: task)
                            }) {
                                Image(systemName: task.isCompleted ? "checkmark.square" : "square")
                                    .foregroundColor(task.isCompleted ? .green : .gray)
                            }
                        }
                    }
                    .onDelete(perform: deleteTask)
                }
                .navigationBarTitle("To-Do List")
                .navigationBarItems(trailing: EditButton())
            }
        }
    }
    
    private func addTask() {
        if !newTaskTitle.isEmpty {
            let newTask = Task(title: newTaskTitle, isCompleted: false)
            tasks.append(newTask)
            newTaskTitle = ""
        }
    }
    
    private func toggleTaskCompletion(task: Task) {
        if let index = tasks.firstIndex(where: { $0.id == task.id }) {
            tasks[index].isCompleted.toggle()
        }
    }
    
    private func deleteTask(at offsets: IndexSet) {
        tasks.remove(atOffsets: offsets)
    }
}

import SwiftUI

@main
struct TodoListApp: App {
    var body: some Scene {
        WindowGroup {
            TodoListView()
        }
    }
}

Explanation:

1. Task Model:
   • A simple Task struct conforming to Identifiable to uniquely identify each task. It contains id, title, and isCompleted properties.
2. TodoListView Struct:
   • State Variables:
     • @State private var tasks = [Task](): Holds the list of tasks.
     • @State private var newTaskTitle = "": Holds the title for the new task being added.
   • NavigationView and VStack:
     • Wraps the form and list in a NavigationView for a navigation bar.
     • Uses VStack to arrange the input field and list vertically.
   • Adding New Tasks:
     • A TextField for entering the new task’s title.
     • An Add button that calls the addTask function to add the task to the list.
   • List View:
     • Displays the list of tasks using a List.
     • Each task has a Text view for the title and a button to toggle its completion status.
     • The onDelete modifier allows users to delete tasks by swiping.
   • Navigation Bar:
     • Sets the navigation bar title to “To-Do List”.
     • Adds an EditButton to enable the user to delete tasks.
3. Functions:
   • addTask(): Adds a new task to the list if the input is not empty.
   • toggleTaskCompletion(task:): Toggles the completion status of a task.
   • deleteTask(at:): Deletes tasks from the list at the specified offsets.

How to Use:

• Copy the code into a new SwiftUI project in Xcode.
• Run the project on a simulator or device to see the to-do list in action.
• Use the text field to add new tasks, the checkmark button to mark tasks as completed, and the delete action to remove tasks from the list.