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| import SwiftUI | |
| struct Todo: Identifiable { | |
| let id: UUID | |
| var title = "Untitled" | |
| var isComplete = false | |
| static var sample: [Todo] { | |
| [ | |
| Todo( | |
| id: UUID(), | |
| title: "Milk", | |
| isComplete: false | |
| ), | |
| Todo( | |
| id: UUID(), | |
| title: "Buy eggs", | |
| isComplete: false | |
| ), | |
| Todo( | |
| id: UUID(), | |
| title: "Clean room", | |
| isComplete: true | |
| ) | |
| ] | |
| } | |
| } | |
| struct ContentView: View { | |
| @State private var todos = Todo.sample | |
| var body: some View { | |
| NavigationView { | |
| // When you need to mutate the elements on a collection inside a list, use binding objects | |
| // DO NOT use indices. That approach is fragile. | |
| List($todos) { $todo in | |
| HStack { | |
| Button { | |
| withAnimation { | |
| todo.isComplete.toggle() | |
| sort() | |
| } | |
| } label: { | |
| Image(systemName: todo.isComplete ? "checkmark.square" : "square") | |
| } | |
| Text(todo.title) | |
| } | |
| .foregroundColor(todo.isComplete ? .gray : nil) | |
| } | |
| .toolbar { | |
| ToolbarItem(placement: .navigationBarTrailing) { | |
| Button { | |
| withAnimation { todos.append(Todo(id: UUID())) } | |
| } label: { | |
| Text("Add") | |
| } | |
| } | |
| } | |
| .navigationTitle("Todo List") | |
| } | |
| } | |
| func sort() { | |
| // There is something wrong on this algorithm, Can you spot what it is? | |
| todos.sort { !$0.isComplete && $1.isComplete } | |
| } | |
| } | |
| struct ContentView_Previews: PreviewProvider { | |
| static var previews: some View { | |
| ContentView() | |
| } | |
| } |
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