Question 171729 in Xcode Question posted in
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Can Xcode fix ‘Missing argument for parameter ‘realmManager’ in call’ error for TasksView() in Realm?

Getting an error of "Missing argument for parameter ‘realmManager’ in call" for TasksView()

I tried to read the documentations for Realm but based on the code, I don’t think there is anything wrong? There is something missing but I don’t know what it is.

Code is below:

TasksView File –

import SwiftUI

struct TasksView: View {
    @Environment var realmManager: RealmManager
    var body: some View {
        VStack {
            Text("Task List")
                .font(.title3).bold()
                .padding()
                .frame(maxWidth: .infinity, alignment: .leading)
            
            
        }
        .frame(maxWidth: .infinity, maxHeight: .infinity)
        .background(Color(hue: 0.086, saturation: 0.141, brightness: 0.901))
    }
}

struct TasksView_Previews: PreviewProvider {
    static var previews: some View {
        TasksView()
            .environmentObject(realmManager)
        
          
    }
}

ContentView2 File –

import SwiftUI

struct ContentView2: View {
    @StateObject var realmManager = RealmManager()
    @State private var showAddTaskView = false
    
    
    var body: some View {
        ZStack(alignment: .bottomTrailing){
            TasksView()
                .environmentObject(realmManager)
            
            SmallAddButton()
                .padding()
                .onTapGesture {
                    showAddTaskView.toggle()
                }
            
            
        }
        .sheet(isPresented: $showAddTaskView) {
            AddTaskView()
                .environmentObject(realmManager)

            
        }
        .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .bottom)
        .background(Color(hue: 0.086, saturation: 0.141, brightness: 0.901))
    }
}

struct ContentView2_Previews: PreviewProvider {
    static var previews: some View {
        ContentView2()
    }
}
Tags:

2

Answers


  1. 0

    @Environment works with the environment view modifier, and allows you to read a value of a particular key path of EnvironmentValues.

    You are using environmentObject to inject the realm manager, since you want to share the realm manager among the views. You should use @EnvironmentObject to read the values from environmentObject modifiers, not @Environment.

    Declare realmManager like this:

    @EnvironmentObject var realmManager: RealmManager
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  2. 0

    I believe the issue is in your declaration of realmManager in TaskView. Whenever you pass an @StateObject to the view hierarchy via environmentObject(_:), the way you use that object in a child view is by wrapping a variable with @EnvironmentObject that has the desired type of object you want to use, not @Environment. There can only be one environment object per type available, allowing SwiftUI to deduce which object your @EnvironmentObject is referencing.

    Example:

    @main
struct MemorizeApp: App {
    // Create @StateObject
    @StateObject var themeStore = ThemeStore()

    var body: some Scene {
        WindowGroup {
            ContentView()
                .environmentObject(themeStore)
                // Allow this same @StateObject to be used in all child views of
                // ContentView, and ContentView itself, as an @EnvironmentObject.
        }
    }
}

    struct ContentView: View {
    // Don't need our @EnvironmentObject here
    // yet, so we don't declare anything.
    var body: some View {
        ThemeChooser()
    }
}

    struct ThemeChooser: View {
    // ThemeChooser is a descendent of ContentView and thus we
    // can use our @EnvironmentObject of type ThemeStore here.
    @EnvironmentObject var store: ThemeStore
    
    var body: some View {
        List {
            ForEach(store.themes) { theme in
                Text(theme)
                // More logic ...
            }
        }
    }
}

    @Environment is used for different purposes and can be read about more here.

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