Post not yet marked as solved
I'm currently trying to save a selected image in core data as a type data, but I'm getting an error in the persistence file marked with a comment. I've included my code and any questions I will gladly answer. Thanks for any help!
Content View:
import SwiftUI
import PhotosUI
struct ContentView: View {
@ObservedObject var persistence = PersistenceController.shared
@State var selectedItems: [PhotosPickerItem] = []
@State var data: Data?
var body: some View {
NavigationView{
VStack{
Spacer()
VStack{
Spacer()
if let data = data, let uiimage = UIImage(data: data) {
Image(uiImage: uiimage)
.resizable()
.scaledToFit()
.frame(width: 250, height: 500)
}
Spacer()
}
Spacer()
PhotosPicker(selection: $selectedItems, maxSelectionCount: 1, matching: .images){
Text("Pick Photo")
}
.onChange(of: selectedItems){ newValue in
guard let item = selectedItems.first else{
return
}
item.loadTransferable(type: Data.self){ result in
switch result {
case .success(let data):
if let data = data{
self.data = data
} else {
print("Data is nil")
}
case .failure(let failure):
fatalError("\(failure)")
}
}
}
Spacer()
}
.navigationBarItems(trailing: addButton)
}
}
var addButton: some View {
Button(action: {
guard let item = selectedItems.first else{
return
}
item.loadTransferable(type: Data.self){ result in
switch result {
case .success(let data):
if let data = data{
persistence.addObject(image: data)
} else {
print("Data is nil")
}
case .failure(let failure):
fatalError("\(failure)")
}
}
}){
Text("Add Image").bold()
}
}
}
Persistence:
import Foundation
import CoreData
class PersistenceController: ObservableObject {
static let shared = PersistenceController()
let container: NSPersistentContainer
init(inMemory: Bool = false) {
container = NSPersistentContainer(name: "ReciPlanner")
if inMemory {
container.persistentStoreDescriptions.first!.url = URL(fileURLWithPath: "/dev/null")
}
container.loadPersistentStores(completionHandler: { (storeDescription, error) in
if let error = error as NSError? {
fatalError("Unresolved error \(error), \(error.userInfo)")
}
})
container.viewContext.automaticallyMergesChangesFromParent = true
}
func addObject(image: Data){
let context = container.viewContext
let object = Object(context: context) //Error: Thread 7: "An NSManagedObject of class 'Object' must have a valid NSEntityDescription."
object.item = image
}
func contextSave() {
let context = container.viewContext
if context.hasChanges {
do {
try context.save()
} catch {
print("**** ERROR: Unable to save context \(error)")
}
}
}
}
Data Model:
Post not yet marked as solved
I'm currently trying to save a selected image in core data as a type data, but I'm getting an error in the persistence file marked with a comment. I've included my code and any questions I will gladly answer. Thanks for any help!
Content View:
import SwiftUI
import PhotosUI
struct ContentView: View {
@ObservedObject var persistence = PersistenceController.shared
@State var selectedItems: [PhotosPickerItem] = []
@State var data: Data?
var body: some View {
NavigationView{
VStack{
Spacer()
VStack{
Spacer()
if let data = data, let uiimage = UIImage(data: data) {
Image(uiImage: uiimage)
.resizable()
.scaledToFit()
.frame(width: 250, height: 500)
}
Spacer()
}
Spacer()
PhotosPicker(selection: $selectedItems, maxSelectionCount: 1, matching: .images){
Text("Pick Photo")
}
.onChange(of: selectedItems){ newValue in
guard let item = selectedItems.first else{
return
}
item.loadTransferable(type: Data.self){ result in
switch result {
case .success(let data):
if let data = data{
self.data = data
} else {
print("Data is nil")
}
case .failure(let failure):
fatalError("\(failure)")
}
}
}
Spacer()
}
.navigationBarItems(trailing: addButton)
}
}
var addButton: some View {
Button(action: {
guard let item = selectedItems.first else{
return
}
item.loadTransferable(type: Data.self){ result in
switch result {
case .success(let data):
if let data = data{
persistence.addObject(image: data)
} else {
print("Data is nil")
}
case .failure(let failure):
fatalError("\(failure)")
}
}
}){
Text("Add Image").bold()
}
}
}
Persistence:
import Foundation
import CoreData
class PersistenceController: ObservableObject {
static let shared = PersistenceController()
let container: NSPersistentContainer
init(inMemory: Bool = false) {
container = NSPersistentContainer(name: "ReciPlanner")
if inMemory {
container.persistentStoreDescriptions.first!.url = URL(fileURLWithPath: "/dev/null")
}
container.loadPersistentStores(completionHandler: { (storeDescription, error) in
if let error = error as NSError? {
fatalError("Unresolved error \(error), \(error.userInfo)")
}
})
container.viewContext.automaticallyMergesChangesFromParent = true
}
func addObject(image: Data){
let context = container.viewContext
let object = Object(context: context) //Error: Thread 7: "An NSManagedObject of class 'Object' must have a valid NSEntityDescription."
object.item = image
}
func contextSave() {
let context = container.viewContext
if context.hasChanges {
do {
try context.save()
} catch {
print("**** ERROR: Unable to save context \(error)")
}
}
}
}
Data Model:
Post not yet marked as solved
So I have a TabView in my app and I want to go back to the original view when that tabItem is pressed. For example, when you open the App Store and go to the games tab, click on a game. It takes you to a navigation link to a new view. You can either go back to the first page by pressing the arrow, or by tapping the “games” tabItem again. I want to be able to press my tabItem in a subview of the same tab to go back to the original view that the tab is assigned to.
Any help would be greatly appreciated! Thanks.
Post not yet marked as solved
So I know this is probably a stretch, but is there any way to airdrop an object from core data? From what I understand airdrop is only used with links, but is there a way to convert the data of a core data object into a file, convert the file into a link, send it via airdrop, and convert it back into a file, and then add that object from a file to another user's core data storage?
Any help would be greatly appreciated. Thanks!!
Post not yet marked as solved
Given an image selected in a UIImagePickerController and saved as a UIImage, how can I save that image in a core data model using XCode 14 beta? I’ve only found videos from 2 years ago where they make their own persistence file which is outdated.
Any help would be greatly appreciated! Thanks.
Post not yet marked as solved
I'm developing an app that has accounts with usernames and passwords to log in. So far I have found firebase, which doesn't look bad, but I'd like to know every available option and what they have to offer before committing to one.
I was curious if Apple had some sort of kit for developers for a login system. Like CloudKit for example, can CloudKit be used to store log in info and be reached when the user is logging in? And if not maybe other options for this.
Thanks for any help!
Post not yet marked as solved
I'm developing an app that has accounts with usernames and passwords to log in. So far I have found firebase, which doesn't look bad, but I'd like to know every available option and what they have to offer before committing to one.
I was curious if Apple had some sort of kit for developers for a login system. And if not maybe other options for this.
Thanks for any help!
Post not yet marked as solved
So I know this is probably a stretch, but is there any way to airdrop an object from core data? From what I understand airdrop is only used with links, but is there a way to convert the data of a core data object into a file, convert the file into a link, send it via airdrop, and convert it back into a file, and then add that object from a file to another user's core data storage?
Any help would be greatly appreciated. Thanks!!
Post not yet marked as solved
So I have a TabView in my app and I want to go back yo the main view when that tabItem is pressed. For example, when you open the App Store and go to the games tab, click on a game. It takes you to a navigation link to a new view. You can either go back to the first page by pressing the arrow, or by tapping the “games” tabItem again. I want to be able to press my tabItem in a subview of the same tab to go back to the original view that the tab is assigned to.
Post not yet marked as solved
So I know this is probably a stretch, but is there any way to airdrop an object from core data? From what I understand airdrop is only used with links, but is there a way to convert the data of a core data object into a file, convert the file into a link, send it via airdrop, and convert it back into a file, and then add that object from a file to another user's core data storage?
Any help would be greatly appreciated. Thanks!!
Post not yet marked as solved
I need help optimizing and fixing my date list builder. Basically the user should be able to build a list of dates in a sheet and it be shown on the original view and go back to that page to add more. Dates should not be repeated hence why I use a set.
Issue: But when the user adds the first date it doesn't show until a second date is added. After some troubleshooting with print I've found that the problem isn't adding the first item to the list, but the ForEach not working until there is a second item.
I've included code for a visual representation of my goal. If you have any questions please leave a comment. Any help would be greatly appreciated. Thanks!
import SwiftUI
struct ContentView: View {
@State private var dates = Set<Date>()
@State private var isDatesShowing = false
var body: some View {
NavigationView{
Form{
Section(""){
addDatesButton
Section{
ForEach(dates.sorted(by: <),id: \.self){ date in
Text(date, style: .date)
.bold()
.foregroundColor(.white)
}
}
}
}
.navigationBarTitle("List of Dates")
.sheet(isPresented: $isDatesShowing){
AddToDateView(dates: $dates)
}
}
.preferredColorScheme(.dark)
}
var addDatesButton: some View{
Button(action: {
isDatesShowing.toggle()
}){
Text("Select Dates")
.bold()
}
}
}
struct AddToDateView: View {
@Environment(\.dismiss) var dismiss
@Binding var dates: Set<Date>
@State var date = Date()
var body: some View {
NavigationView{
Form{
DatePicker(selection: $date, in: Date.now..., displayedComponents: .date) {
Text("Select a date")
}
.datePickerStyle(WheelDatePickerStyle())
Button(action:{
dates.insert(date)
}){
Text("Add Date")
}
Section("Dates"){
ForEach(dates.sorted(by: <),id: \.self){ date in
Button(action: {
dates.remove(date)
}){
Text(date, style: .date)
.bold()
.foregroundColor(.white)
}
}
}
}
.cornerRadius(10)
.navigationBarItems(trailing: submitButton)
}
}
var submitButton: some View{
Button(action: {
dismiss()
}){
Text("Submit")
.bold()
}
}
}
Post not yet marked as solved
So this project is pretty straightforward. I have an item. The use can create, get a closer look at, delete, or edit an item. For some reason, no matter how many different ways I try to do it, the edit part does not work. I've tried moving the sheet outside of the context menu (it only opens the bottom item), I've tried moving it under the list using the first index of the item (it crashes), and finally I've tried it the shown way and it just doesn't do anything. If anyone can come up with a better way to open the edit view for the correct item (preferably using a context menu, but something similar is acceptable) I would really appreciate it.
I've provided the project for a better understanding of what I'm trying to do. If you have any questions just leave a comment.
Any help would be greatly appreciated.
Content View:
struct ContentView: View {
@Environment(\.managedObjectContext) var managedObjContext
@ObservedObject var persistence = PersistenceController.shared
@State private var items = PersistenceController.shared.getItems()
@State private var showingEditView = false
@State private var showingAddView = false
var body: some View {
NavigationView{
List{
Section(""){
ForEach(items) { item in
NavigationLink(destination: ItemView(item: item)){
Text(item.name!)
}
.contextMenu{
Button(action: {
self.showingEditView.toggle()
}){
Text("Edit Item")
}
.sheet(isPresented: $showingEditView){
EditItemView(item: item)
.onDisappear(perform: {
items = persistence.getItems()
})
}
}
}
.onDelete(perform: { indexSet in
deleteItem(indexSet: indexSet)
})
}
}
.listStyle(InsetGroupedListStyle())
.cornerRadius(10)
.navigationBarTitle("My Items")
.navigationBarItems(trailing: addButton)
.onAppear(perform: {
items = persistence.getItems()
})
.sheet(isPresented: $showingAddView){
AddItemView()
.onDisappear(perform: {
items = persistence.getItems()
})
}
}
}
var addButton: some View {
Button(action: {
showingAddView.toggle()
}){
Text("Add an Item").bold()
}
}
func deleteItem(indexSet: IndexSet){
withAnimation{
indexSet.map {
items[$0]
}
.forEach(managedObjContext.delete)
persistence.contextSave()
items = persistence.getItems()
}
}
}
Item View:
struct ItemView: View{
@State var item: Item
var body: some View{
Text(item.name ?? "No Name")
}
}
Add View:
struct AddItemView: View{
@Environment(\.dismiss) var dismiss
@ObservedObject var persistence = PersistenceController.shared
@State private var name = ""
var body: some View {
Form{
TextField("Item Name", text: $name)
Button(action:{
persistence.addItem(name: name)
dismiss()
}){
Text("Add Item")
}
}
}
}
Edit View:
struct EditItemView: View{
@Environment(\.dismiss) var dismiss
@ObservedObject var persistence = PersistenceController.shared
@State var item: Item
@State private var name = ""
var body: some View {
Form{
TextField("Item Name", text: $name)
Button(action:{
persistence.addItem(name: name)
dismiss()
}){
Text("Add Item")
}
}
.onAppear{
name=item.name ?? "No Name"
}
}
}
Persistence File:
class PersistenceController : ObservableObject{
static let shared = PersistenceController()
let container: NSPersistentContainer
init(inMemory: Bool = false) {
container = NSPersistentContainer(name: "Test")
if inMemory {
container.persistentStoreDescriptions.first!.url = URL(fileURLWithPath: "/dev/null")
}
container.loadPersistentStores(completionHandler: { (storeDescription, error) in
if let error = error as NSError? {
fatalError("Unresolved error \(error), \(error.userInfo)")
}
})
container.viewContext.automaticallyMergesChangesFromParent = true
}
static var preview: PersistenceController = {
let result = PersistenceController(inMemory: true)
let viewContext = result.container.viewContext
for _ in 0..<10 {
let newItem = Item(context: viewContext)
newItem.id = UUID()
newItem.name = "Test"
}
do {
try viewContext.save()
} catch {
let nsError = error as NSError
fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
}
return result
}()
func getItems() -> [Item] {
let context = container.viewContext
var request = NSFetchRequest<Item>()
request = Item.fetchRequest()
request.entity = NSEntityDescription.entity(forEntityName: "Item", in: context)
do {
let items = try context.fetch(request)
if items.count == 0 { return []}
return items.sorted(by: {$0.name! > $1.name!})
} catch {
print("**** ERROR: items fetch failed \(error)")
return []
}
}
func addItem(name: String){
let context = container.viewContext
let item = Item(context: context)
item.id = UUID()
item.name = name
contextSave()
}
func contextSave() {
let context = container.viewContext
if context.hasChanges {
do {
try context.save()
self.objectWillChange.send()
} catch {
print("**** ERROR: Unable to save context \(error)")
}
}
}
}
Data Model:
Post not yet marked as solved
So I have a TabView in my app and I want to go back yo the main view when that tabItem is pressed. For example, when you open the App Store and go to the games tab, click on a game. It takes you to a navigation link to a new view. You can either go back to the first page by pressing the arrow, or by tapping the “games” tabItem again. I want to be able to press my tabItem in a subview of the same tab to go back to the original view that the tab is assigned to.
I have an object called Item with two attributes, name (String) and value (Double). Given an array of Items I need combine the values of all items with the same name and keep the items with no duplicates. For example, say there were 4 items in the array and two of them named "Test" and the others "Object" and "Item". "Object" and "Item" would remain in the list, but the values of the two "Test"s would be combined into one item with the same name "Test".
I've included the following code for a visual representation.
Delete the comments as you read them to clean up. They're just there to clear up any confusion. Leave a comment if you have any questions. Thanks for the help!
Content View:
import SwiftUI
import CoreData
struct ContentView: View {
@Environment(\.managedObjectContext) var managedObjContext
@ObservedObject var persistence = PersistenceController.shared
@State private var items = PersistenceController.shared.getItems()
@State var isAddViewShowing = false
var body: some View {
NavigationView{
List{
Section{
ForEach(items) { item in //Displays the list of items
HStack{
Text(String(item.name!))
Spacer()
Text(String(Int(item.value)))
}
}
.onDelete(perform: { indexSet in
deleteItem(indexSet: indexSet)
})
}
}
.navigationBarTitle("Items")
.navigationBarItems(leading: combineItemsButton, trailing: addButton)
.sheet(isPresented: $isAddViewShowing){ //displays the view to add an item
AddView()
.onDisappear(perform: {
items = persistence.getItems() //"refreshes" the list of items
})
}
}
}
var combineItemsButton: some View{
Button(action:{
//combine duplicates here
persistence.contextSave()
items = persistence.getItems()
}){
Text("Combine Duplicates")
.bold()
}
}
var addButton: some View{
Button(action:{
isAddViewShowing.toggle()
}){
Text("Add Item")
.bold()
}
}
func deleteItem(indexSet: IndexSet){
withAnimation{
indexSet.map {
items[$0]
}
.forEach(managedObjContext.delete)
persistence.contextSave()
items = persistence.getItems()
}
}
}
Add View:
struct AddView: View{
@Environment(\.dismiss) var dismiss
@ObservedObject var persistence = PersistenceController.shared
@State var name: String = ""
@State var value = ""
@State private var alertMessage = ""
@State private var showAlert = false
var body: some View{
NavigationView{
Form{
TextField("Item Name", text: $name)
TextField("Item Value", text: $value)
.keyboardType(.decimalPad)
}
.navigationBarTitle("Add Item")
.navigationBarItems(leading: dismissButton, trailing: submitButton)
}
}
var submitButton: some View{
Button(action: {
if (name == ""){ //ensures the item has a name
alertMessage="Your recipe needs a name"
showAlert.toggle()
} else {
persistence.addItem(name: name, value: Double(value) ?? 2)
dismiss()
}
}){
Text("Submit")
.bold()
}
.alert(alertMessage, isPresented: $showAlert){
Button("OK",role: .cancel){}
}
}
var dismissButton: some View{
Button(action: {
dismiss()
}){
Text("Cancel")
.bold()
}
}
}
Persistence File:
import CoreData
class PersistenceController : ObservableObject{
static let shared = PersistenceController()
let container: NSPersistentContainer
init(inMemory: Bool = false) {
container = NSPersistentContainer(name: "Test")
if inMemory {
container.persistentStoreDescriptions.first!.url = URL(fileURLWithPath: "/dev/null")
}
container.loadPersistentStores(completionHandler: { (storeDescription, error) in
if let error = error as NSError? {
fatalError("Unresolved error \(error), \(error.userInfo)")
}
})
container.viewContext.automaticallyMergesChangesFromParent = true
}
func getItems() -> [Item] { //fetches items
let context = container.viewContext
var request = NSFetchRequest<Item>()
request = Item.fetchRequest()
request.entity = NSEntityDescription.entity(forEntityName: "Item", in: context)
do {
let items = try context.fetch(request)
if items.count == 0 { return []}
return items.sorted(by: {$0.name! > $1.name!})
} catch {
print("**** ERROR: items fetch failed \(error)")
return []
}
}
func addItem(name: String, value: Double){
let context = container.viewContext
let item = Item(context: context)
item.id = UUID()
item.name = name
item.value = value
contextSave()
}
func contextSave() {
let context = container.viewContext
if context.hasChanges {
do {
try context.save()
self.objectWillChange.send()
} catch {
print("**** ERROR: Unable to save context \(error)")
}
}
}
}
Data Model:
Post not yet marked as solved
Basically I need a view with a calendar that will show data attributes from the item. I've tried two different approaches both have their listed problems. There must be a better way to do something like this. Surely it's not ideal to create a new item every time a date is opened or constantly check if something is there, but I don't know any other way.
Actual View:
import SwiftUI
import CoreData
struct ContentView: View {
@Environment(\.managedObjectContext) var managedObjContext
@Environment(\.calendar) var calenda
@Environment(\.dismiss) var dismiss
@FetchRequest(sortDescriptors: [], predicate: NSPredicate(format: "timestamp == %@", Date.now as CVarArg)) var items: FetchedResults<Item>
@State private var date = Date.now
var body: some View {
NavigationView{
VStack{
DatePicker("Calendar", selection: $date, in: Date.now...,displayedComponents: [.date])
.datePickerStyle(.graphical)
.onAppear(perform: {
if (items.isEmpty){
PersistenceController().addItem(date: date, context: managedObjContext)
}
})
.onChange(of: date){ value in
items.nsPredicate=NSPredicate(format: "timestamp == %@", date as CVarArg)
if (items.isEmpty){
PersistenceController().addItem(date: date, context: managedObjContext)
}
}
if (!items.isEmpty){
//This is the only difference in the two approaches. I just put either one of the next two blocks of code in here
}
}
.navigationBarTitle("My Planner")
}
}
func getTitle(date: Date)->String{
let formatter = DateFormatter()
formatter.dateStyle = .medium
return formatter.string(from: date)
}
}
First (looks correct, but doesn't show the changes live):
PlannedMealsView(item: items[0])
Spacer()
//And then this is added at the bottom
struct PlannedMealsView: View {
@Environment(\.managedObjectContext) var managedObjContext
@State var item: Item
var body: some View {
VStack{
Text(item.timestamp ?? Date.now, style: .date)
.font(.title2)
.bold()
Section("Word"){
if(item.word != nil){
HStack{
Spacer()
Text(item.word!)
Spacer()
Button(action: {
PersistenceController().removeFromItem(item: item, context: managedObjContext)
}){
Image(systemName: "minus.circle").bold()
}
Spacer()
}
} else {
Button(action: {
PersistenceController().addToItem(item: item, context: managedObjContext)
}){
Image(systemName: "plus.circle").bold()
.padding(.vertical, 10)
.padding(.horizontal, 20)
}
}
}
Spacer()
}
.frame(height:200)
}
}
Second (allows direct access to the objects data, but bugs after 5 or 6 date changes):
VStack{
Text(items[0].timestamp ?? Date.now, style: .date)
.font(.title2)
.bold()
Section("Word"){
if(items[0].word != nil){
HStack{
Spacer()
Text(items[0].word!)
Spacer()
Button(action: {
PersistenceController().removeFromItem(item: items[0], context: managedObjContext)
}){
Image(systemName: "minus.circle").bold()
}
Spacer()
}
} else {
Button(action: {
PersistenceController().addToItem(item: items[0], context: managedObjContext)
}){
Image(systemName: "plus.circle").bold()
.padding(.vertical, 10)
.padding(.horizontal, 20)
}
}
}
Spacer()
}
.frame(height:200)
Unchanged Files:
Persistence-
import CoreData
struct PersistenceController {
static let shared = PersistenceController()
let container: NSPersistentContainer
init(inMemory: Bool = false) {
container = NSPersistentContainer(name: "Test")
if inMemory {
container.persistentStoreDescriptions.first!.url = URL(fileURLWithPath: "/dev/null")
}
container.loadPersistentStores(completionHandler: { (storeDescription, error) in
if let error = error as NSError? {
fatalError("Unresolved error \(error), \(error.userInfo)")
}
})
container.viewContext.automaticallyMergesChangesFromParent = true
}
func addItem(date: Date, context: NSManagedObjectContext){
let item = Item(context: context)
item.timestamp = date
item.word = nil
save(context: context)
}
func addToItem(item: Item, context: NSManagedObjectContext){
item.word = "Test"
save(context: context)
}
func removeFromItem(item: Item, context: NSManagedObjectContext){
item.word = nil
save(context: context)
}
func save(context: NSManagedObjectContext){
do {
try context.save()
} catch {
let nsError = error as NSError
fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
}
}
}
Data Model-
If you have any questions I'll be happy to answer. Any help is greatly appreciated. All the best!
WeagleWeagle.