I have alternating colors set for my list with: .listRowBackground((self.restaurants.firstIndex(of: restaurant)! % 2 == 0) ? Color.myLightGray: Color.white), but when I delete a row, program crashes and returns the following error: Fatal error: Unexpectedly found nil while unwrapping an Optional value
If I remove the .listRowBackground line in the code, the program runs fine when I delete a row in the list, but of course I don’t get alternating colors.
I appreciate any help in solving this error.
List {
ForEach(restaurants) { restaurant in
NavigationLink(value: restaurant) {
VStack {
HStack {
let uiimage = UIImage(data: restaurant.photo)
Image(uiImage: uiimage ?? UIImage(imageLiteralResourceName: "pepper"))
.resizable()
.aspectRatio(contentMode: .fill)
.frame(maxWidth: 40, maxHeight: .infinity)
.clipShape(Circle())
.padding(.init(top: 0, leading: 0, bottom: 0, trailing: 0))
Text(restaurant.location)
Spacer()
EmojiRatingView(rating: restaurant.mainGrade)
.font(.system(size: 12))
.foregroundColor(.red)
}
}.frame(height: 36)
}
.listRowBackground((self.restaurants.firstIndex(of: restaurant)! % 2 == 0) ? Color.myLightGray: Color.white)
}.onDelete(perform: deleteRestaurants)
}
func deleteRestaurants(at offsets: IndexSet) {
for offset in offsets {
let restaurant = restaurants[offset]
modelContext.delete(restaurant)
}
}
>Solution :
This is expected behavior, you’re forcing unwrap by (self.restaurants.firstIndex(of: restaurant)!. Try to provide a default value if it is nil instead of forcing it like this.
.listRowBackground(
(restaurant.firstIndex(of: restaurant) ?? 0) % 2 == 0 ? Color.myLightGray: Color.white
)