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Questions tagged [observedobject]

@ObservedObject is a SwiftUI property wrapper used to mark properties that are not owned by the View, but should update the View. Only ObservableObject conformant types can be annotated with the @ObservedObject property wrapper.

For more info, see the official documentation of @ObservedObject.

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Deleting CoreData Item which is also an @ObservedObject in DetailView causing App Crash in Swift 5

I am currently working with SwiftUI and CoreData. Situation: I have a User Detail View with a Delete Button. When pressed, the Core Data Entry of the User is getting deleted and the App Navigation goes back to the Root Navigation View, which is a…
christophriepe
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SwiftUI View not updating on async change to published properties of Observed Object

I have the following SwiftUI View: struct ProductView: View { @ObservedObject var productViewModel: ProductViewModel var body: some View { VStack { ZStack(alignment: .top) { if(self.productViewModel.product != nil) { …
Sebastian
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How to be notified of change to ObservedObject which conforms to a protocol

I'm building an AutoCompletion view and would like to pass an object which contains the field to be autocompleted. Currently I have two different types which I need to autocomplete on an attribute of, both attributes are named the same. I've created…
Houdi
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SwiftUI pass by reference a class object to another view

I'm trying to learn SwiftUI and I'm going to develop a simple app with tab views and sharing core motion data between those views. The main idea is to create a motion manager object (like here) and use the sensor values in all…
Murokill
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SwiftUI @Published and @ObservedObject not going to NavigationLink destination

Sorry for the title and length I struggled to summerise I have a class of @ObserableObject @Published data which I want to change and use the new data on a second page accessed via NavigationLink class Data: ObservableObject { @Published var…
SD449
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SwiftUI Is it possible to use Toggle to update value of ObservableObject

I have a date selector in a view and, once the user enters a date and saves I display a new view with a toggle. Ideally, once the users flips the toggle I'd like to be able to set a reminder using the date field already entered. I have created an…
BobdeBloke
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Changes to Observed Object not reflected (intermittently) when sheet is dismissed

I am using a class conforming to ObservableObject to store locations. I have used @AppStorage to persist an array of locations selected by a user. class SavedLocations: ObservableObject { @AppStorage("Locations") var all = [Location]() func…
John Harrington
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Saving state across views

I would like to implement a multi view questionnaire for the user to enter details about themselves. Therefore, I need a persistent storage about what the user picks preferably in an object that I can pass through different views which each mutate a…
unknownUser
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@StateObject vs @ObservedObject in a UIKit parent environment

I have a banner component written in SwiftUI that I am embedding in a ViewController using a UIHostingController.view as a return type in a method: public static func createBannerView(thing: String) -> UIView? { let viewModel =…
Wesley
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Is this the right way for using @ObservedObject and @EnvironmentObject?

Cow you give me some confirmation about my understanding about @ObservedObject and @EnvironmentObject? In my mind, using an @ObservedObject is useful when we send data "in line" between views that are sequenced, just like in "prepare for" in UIKit…
biggreentree
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Environment dismiss provokes ObservableObject not publishing changes

I have a NavigationView which navigates to a first detail view. From this first detail view it navigates to a second detail view. In this second detail view I compose the UI observing a detailViewModel enum that stores the state: notRequested,…
rai212
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Swiftui: List not displaying loaded data from viewModel

Hope you're well! I have an issue where updates to an array in my view model aren't getting picked up until I exit and re-open the app. Background: My App loads a view from a CSV file hosted on my website. The app will iterate through each line and…
Al McIver
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I want to click a button inside the First View and pass a Bool to the ContentView to show the secondView inside ContentView. How i can do it?

I make Observable class with Published var I want to click a button inside the First View and pass a Bool to the ContentView to show the secondView inside ContentView. How i can do it? The code in my First View is: class ShowPicker: ObservableObject…
Dmitry
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SwiftUI: View does not fully update, lags behind when its @ObservedObject is updated from parent?

I have the following code: struct ContentView: View { @Environment(\.managedObjectContext) private var viewContext @State var selectedItemMOID:NSManagedObjectID? var body: some View { NavigationView { …
zumzum
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SwiftUI NavigationView popping when observed object changes

There are three views. Main view, a List view (displaying a list of locations) and a Content view (displaying a single location). Both the List view and the Content view are watching for changes from LocationManager(GPS position). If the user…
Karlth
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