Questions tagged [observableobject]
262 questions
0
votes
2 answers
In SwiftUI, how to implement @Published class in the right way
In SwiftUI, I have a class for user data and I convert JSON data into it:
class UserData: Codable {
var displayName: String
var employeeId: String
var firstName: String
var lastName: String
// more ...
}
by…
Joe Huang
- 6,296
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0
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2 answers
SwiftUI state management
I have encountered an architectural problem with SwiftUI state.
Consider an architecture with a uni-directional data flow.
class Store: ObservableObject {
@Published private(set) var state: AppState = AppState(initialValue: 0)
func…
Mikayel Aghasyan
- 225
- 2
- 11
0
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1 answer
Fatal error: No ObservableObject of type IconNames found. A View.environmentObject(_:) for IconNames may be missing as an ancestor of this view
I have created a class in SceneDelegate.swift file and I am trying to access it in SettingView.swift and ContentView.swift but I keep getting this error "Fatal error: No ObservableObject of type IconNames found. A View.environmentObject(_:) for…
Ansh Patel
- 15
- 5
0
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0 answers
Fatal Error using @EnvironmentObject in SwiftUI
import Foundation
import SwiftUI
import UserNotifications
class NotificationHandler: ObservableObject {
@Published var notificationCounter = 0
func askPermission() {
UNUserNotificationCenter.current().requestAuthorization(options:…
0
votes
2 answers
SwiftUI - Error popup fired in multiple views
Im trying to use MV architecture in my project, below is a simple example of my code:
struct PaymentView: View {
@StateObject private var store = PaymentStore()
var body: some View {
NavigationStack {
…
OuSS
- 19
- 3
0
votes
1 answer
Is it possible to have two init in an ObservableObject class?
I have created an ObservableObject object class, and I need to create 2 inits one with passing a string parameter and another without passing.
class DictionaryModel: ObservableObject {
@Published var dbName: String = ""
private var dbQueue:…
Mc.Lover
- 4,813
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0
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1 answer
Keeping the original datasource in sync with downstream bindings
If I have a collection of fruits, and I pass one of them to a detail view, how do I edit that item so that both the item and it's original datasource are updated?
final class Merchant: ObservableObject {
@Published
var selection:…
bobby123uk
- 892
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- 17
0
votes
1 answer
How to create a generic persistent array of ObservableObjects in Swift
I have a class that implements an array of ObservableObjects that will save itself to persistent storage whenever one of the objects changes. Here is a very simplified version of the working code:
class MyObject : ObservableObject {
@Published…
mstrsn
- 21
- 3
0
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0 answers
SwiftUI: How wrong is to call the objectWillChange.send() after the change in the model data happened?
I'm trying to better understand the mechanism how SwiftUI gets notified about changes in observed data and invalidates UI.
In particular, I wonder if something won't work correctly (e.g. animations?) when objectWillChange.send() is called on…
Tom Kraina
- 3,569
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Passing data in PreviewProvider SwiftUI, ObservableObject class, ObservedObject
I guys, I have a class with some properties (class ReservationInfo). In my first screen (ReservationFormView) I create an instance of the class(myReservationInfo).
I pass the data with a NavigationLink to the second view (ReservationRecapView). It…
0
votes
1 answer
How would I access a published variable from another class?
So I am currently working on my app and have come across a problem where I have to access a published variable in another observable class.
Here is some code on what I am trying to do
class PeriodViewModel: ObservableObject {
@Published var…
GoddlyGut
- 3
- 5
0
votes
1 answer
SwiftUI: How could I use polymorphism to make a model class create its own View
I am trying to build a small App in which you can create tests with questions using SwifUI, but finding how to make everything works out is getting hard for a newbie like me. The app would show a list of questions in a main scrollable view and these…
Felix Uff
- 11
- 3
0
votes
1 answer
A struct mutating properties or ObservableObject Published properties to drive data changes
I would like help to further understand the implications of using the following 2 methods for driving data between multiple views.
My situation:
A parent view initialises multiple child views with data passed in.
This data is a big object.
Each…
meteorBuzz
- 3,110
- 5
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0
votes
0 answers
No ObservableObject of type error when calling variable inside struct
I am trying to create a crime tracking app, but right now I am struggling to create structs for different tabs of my app using NavigationManager and screens. However when I made a new struct and tried to use my NavigationManager, it displayed this…
Linda Xue
- 21
- 4
0
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1 answer
Passing Data between Delegate and ViewModel ObservableObjects
I have an app built using SwiftUI that works with user location. Using online tutorials, I have come up with a class LocationManager that handles the request using the delegate method and has an attribute @Published that sets the location as soon as…
greatxp117
- 57
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