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Questions tagged [environmentobject]

59 questions
9
votes
1 answer

SwiftUI randomly crashes on presentationMode?.wrappedValue.dismiss()

This is how the crash looks like So it randomly crashes on the UIKit line UIKitCore -[UIViewController _ancestorViewControllerOfClass:allowModalParent:] + 44 I have View in default SwiftUI navigation stack: struct MyView: View { …
Paul T.
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6
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1 answer

What is the difference between @EnvironmentObject and @ObservedObject?

I have been reading about the property wrappers in SwiftUI and I see that they do a great job, but one thing which I really don't get is the difference between @EnvironmentObject and @ObservedObject. From what I learned so far, I see that…
Dakata
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4
votes
2 answers

Swiftui: @environmentObject - Cannot use instance member within property initializer; property initializers run before 'self' is available

I try to pass data from an @environmentObject to a @State object in the TopLevel struct ContentView: View { @EnvironmentObject var countRecognizer: themeCounter @State var theme: themeModel = themeData[countRecognizer.themeCount] …
Ian
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2
votes
2 answers

Passing environment object between non-view classes in SwiftUI

I understand that EnvironmentObject property wrapper can be used to pass around objects to views. I have a session object which I am passing around to my views. Now I have a requirement to pass this into one of my model classes (i.e., non-view).…
Pradyot
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2
votes
2 answers

How to use EnvironmentObject in app file in SwiftUI

Is it possible to use EnvironmentObject in the app file for a new SwiftUI 2.0 project? I'm using the following code and I get the error: Fatal error: No ObservableObject of type Authentication found. A View.environmentObject(_:) for Authentication…
alionthego
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2
votes
1 answer

SwiftUI: Using environment objects with Xcode 12/iOS 14 (--> How/where to place an object in the environment?)

in the process of programming my first iOS app I encountered a new issue that I was not able to find a solution for so far: I want to use an environment object to pass information to various views. I know there are many explanations and tutorials…
Malburrito
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2
votes
2 answers

Trying to access the environment object created inside scene delegate by another scenedelegate function

I have created an environment object in my scendelegate and want to also use it in another function that resides inside my scenedelegate. The code looks as follows: SceneDelegate.swift class SceneDelegate: UIResponder, UIWindowSceneDelegate { …
TJ D'Alessandro
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2
votes
1 answer

SwiftUI prevent onReceive from firing on load

Is there any way to prevent onReceive from firing when the view initially loads when the variable I'm trying to receive is a @Published property of an @EnvironmentObject? Here's the view: struct ContentView: View { @EnvironmentObject var…
Dennis Calla
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2
votes
1 answer

SwiftUI NavigationLink @Binding of an array element causes Fatal error: Index out of range

I am having an observable object that is my unique source of truth : class NetworkFetcher: ObservableObject { @Published var list: [Car] = [Car(id: UUID().uuidString, name: "Tesla"), Car(id: UUID().uuidString, name: "BMW")] func erase() { …
Heliot Zakar
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2
votes
1 answer

SwiftUI: Index out of range when deleting cells with toggle

I have problems with deleting cells that contain a Toggle. My model looks like this: class Model: ObservableObject { @Published var items: [Item] init(items: [Item]) { self.items = items } } struct Item: Identifiable { …
Nico
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2
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1 answer

Access @Environment object from UIViewControllerRepresentable object

I used this approach to incorporate camera with swiftUI: https://medium.com/@gaspard.rosay/create-a-camera-app-with-swiftui-60876fcb9118 The UIViewControllerRepresentable is implemented by PageFourView class. PageFourView is one of the TabView of…
Alina
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2
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1 answer

How to use edit an environment object from a class function?

I am new to swift programming. I was trying to play around with the environment object to update views by changing the value of the environment object specifically via a class function. I have two subviews in the contentview as I wish to see if…
mic
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2
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0 answers

SwiftUI. How to keep VIPER protocols adding EnvironmentObject?

I'm trying to use VIPER architecture with SwiftUI, using some protocols I was already using with UIKit. These are my BasePresenter and Assembler implementations: class BasePresenter : NSObject, Presenter { typealias View = V …
emelagumat
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1
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0 answers

SwiftUI - Can't find EnvironmentObject in UITests

I'm trying to use @EnvironmentObject in my UITests, but I get an error at runtime. Thread 1: Fatal error: No ObservableObject of type Person found. A View.environmentObject(_:) for Person may be missing as an ancestor of this view. Doesn't…
Lex Brouwers
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1
vote
2 answers

Can't get SwiftUI View objects to update from @Published ObservableObject or @EnvironmentObject variables

I've done a ton of searching and read a bunch of articles but I cannot get SwiftUI to dynamically update the view based on changing variables in the model, at least the kind of thing I'm doing. Basically I want to update the view based on the app's…
Jordan
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