SwiftUI crash: AttributeGraph precondition failure

Code Block Swift...            List {                ForEach(filteredThings, id: \.self) { item in                    itemRow(item: item, matched: $matched)                }            }...

Code Block ...            List {                   ForEach(filteredThings, id: \.self) { item in                          itemRow(item: item, matched: $matched)                 }            }.id(UUID())...

Same happens to me with a LazyVGrid, when I add and remove array items repeatedly (doesn't have to be fast), but only when using withAnimation. My use case is a "See All" / "Show Less" toggle.

In the button action:

withAnimation(.easeInOut(duration: 0.3)) { showAll.toggle() }

Without withAnimation I can toggle 100 times and still no crash.

Hi, I experienced this horrible problem and in my case was when using TabView.

I have TabView in my ContentView and then one of the List views inside had a NavigationView At the beginning I thought it was something wrong with my code cos was working previously. But after struggling a while. I moved the NavigationView to wrap the whole TabView and that fixed the issue.

So I will write here both examples the Non working one and the fix I did in case that might help others.

Problematic Code

struct ContentView: View {
 
    @EnvironmentObject var dataModel: DataModel
 
    var body: some View {
      TabView {
                LibraryList()
                    .tabItem {
                        Label(L10n.library, systemImage: Images.System.library)
                    }
                SettingsList()
                    .tabItem {
                        Label(L10n.more, systemImage: Images.System.more )
 
                    }
            }
    }
}
 
struct LibraryList: View {
 
    @EnvironmentObject var dataModel: DataModel
 
    var body: some View {
         NavigationView { // This navigation here seems to be the issue
               List(dataModel.books) { book in
                       NavigationLink(destination: Text("Book")) { // The crash seems to complain here.
                               Text("Book name: \(book.name)")
                      }
              }
        }
   }
}
 
 

The working solution

struct ContentView: View {
 
    @EnvironmentObject var dataModel: DataModel
 
    var body: some View {
          NavigationView { // Moved navigation view before TabView.
                TabView {
                       LibraryList()
                              .tabItem {
                                       Label(L10n.library, systemImage: Images.System.library)
                                }
                        SettingsList()
                               .tabItem {
                                       Label(L10n.more, systemImage: Images.System.more )
                                 } 
                    }
           }
    }
}
 
struct LibraryList: View {
 
    @EnvironmentObject var dataModel: DataModel
 
    var body: some View { 
               List(dataModel.books) { book in
                       NavigationLink(destination: Text("Book")) { // The crash seems to complain here.
                               Text("Book name: \(book.name)")
                      }
              }
     }
}

I hope this helps some of you.

The above solutions didn't work for me, but I figured it out. I had a code that nests ForEach inside LazyVStack inside ScrollView inside NavigationView inside TabView.

Quickly scrolling the list would result in:

AttributeGraph precondition failure: setting value during update: 2232

Simple exchanging the order of NavigationView and TabView did not work for me. What I did was to add .id(UUID()) to each tab views:

TabView {
    MyView()
        .id(UUID())
        .tabItem {

I didn't have to swap NavigationView and TabView nesting order.

It worked!

I had a NavigationView inside a NavigationView, removing the it from the child fixed it.