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// |
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// SimpleListOfThingsView.swift |
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// JustOneThingWatch |
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// |
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// Created by Alan Francis on 10/07/2023. |
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// |
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|
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import SwiftUI |
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import CoreData |
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|
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struct SimpleListOfThingsView: View { |
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@Environment(\.managedObjectContext) private var viewContext |
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@FetchRequest( |
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sortDescriptors: [NSSortDescriptor(keyPath: \PersistentThing.createdAt, ascending: true)], |
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animation: .default) |
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private var items: FetchedResults<PersistentThing> |
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|
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var body: some View { |
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List { |
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ForEach(items) { item in |
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Text(item.text ?? "no text") |
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} |
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} |
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} |
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} |
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// |
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// ListOfThingsView.swift |
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// JustOneThing |
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// |
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// Created by Alan Francis on 10/07/2023. |
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// |
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|
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import SwiftUI |
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import CoreData |
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|
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struct ListOfThingsView: View { |
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@Environment(\.managedObjectContext) private var viewContext |
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|
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@FetchRequest( |
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sortDescriptors: [NSSortDescriptor(keyPath: \PersistentThing.createdAt, ascending: true)], |
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animation: .default) |
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private var things: FetchedResults<PersistentThing> |
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private let timeFormatter: DateFormatter = { |
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let formatter = DateFormatter() |
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formatter.dateStyle = .none |
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formatter.timeStyle = .medium |
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return formatter |
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}() |
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|
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var body: some View { |
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NavigationView { |
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List { |
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ForEach(things) { thing in |
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NavigationLink { |
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Text(thing.text ?? "no text") |
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} label: { |
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Text(thing.text ?? "no text") |
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} |
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} |
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.onDelete(perform: deleteItems) |
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} |
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#if os(iOS) |
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.toolbar { |
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ToolbarItem(placement: .navigationBarTrailing) { |
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EditButton() |
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} |
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ToolbarItem { |
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Button(action: addItem) { |
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Label("Add Item", systemImage: "plus") |
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} |
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} |
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} |
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#endif |
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Text("Select an item") |
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} |
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} |
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private func addItem() { |
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withAnimation { |
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let newThing = PersistentThing(context: viewContext) |
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newThing.createdAt = Date() |
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newThing.uuid = UUID() |
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newThing.text = "thing created \(timeFormatter.string(from: Date()))" |
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do { |
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try viewContext.save() |
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} catch { |
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// Replace this implementation with code to handle the error appropriately. |
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// fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development. |
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let nsError = error as NSError |
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fatalError("Unresolved error \(nsError), \(nsError.userInfo)") |
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} |
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} |
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} |
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private func deleteItems(offsets: IndexSet) { |
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withAnimation { |
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offsets.map { things[$0] }.forEach(viewContext.delete) |
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|
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do { |
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try viewContext.save() |
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} catch { |
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// Replace this implementation with code to handle the error appropriately. |
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// fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development. |
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let nsError = error as NSError |
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fatalError("Unresolved error \(nsError), \(nsError.userInfo)") |
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} |
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} |
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} |
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} |
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