Question

我在使用coredata来存储FoodItems的应用程序中使用swiftUI。在我的应用程序中，我有一个存储在用户设备上的所有foodItems的列表。假定它们应该能够通过长按并按住吃或扔掉的方式删除任何foodItem，但是每次我尝试删除任何foodItem时，它总是删除列表中的第一个，而不是一个我长按了。谁能帮我？这是我的代码段：

    ForEach(self.storageIndex.foodItemArray, id:\.self) { item in

    RefrigeratorItemCell(icon: item.wrappedSymbol, title: item.wrappedName, lastsUntil: self.addDays(days: Int(item.wrappedStaysFreshFor), dateCreated: item.wrappedInStorageSince))
        .gesture(LongPressGesture()
            .onEnded({ i in
                self.showEatActionSheet.toggle()
            })
    )
        //TODO: Make a diffrence between eat all and throw away
        .actionSheet(isPresented: self.$showEatActionSheet, content: {
            ActionSheet(title: Text("More Options"), message: Text("Chose what to do with this food item"), buttons: [
                .default(Text("Eat All"), action: {
                    self.managedObjectContext.delete(item)
                    try? self.managedObjectContext.save()
                })
                ,.default(Text("Throw Away"), action: {
                    self.managedObjectContext.delete(item)
                    try? self.managedObjectContext.save()
                })

                ,.default(Text("Cancel"))
            ])
        })

}

Answer 1

您应该改为使用.actionSheet(item:并将其移出ForEach周期，如下面的示例所示

@State private var foodItem: FoodItem? // << tapped item (use your type)

// .. other code

VStack {     // << some your parent container
    ForEach(self.storageIndex.foodItemArray, id:\.self) { item in

        RefrigeratorItemCell(icon: item.wrappedSymbol, title: item.wrappedName, lastsUntil: self.addDays(days: Int(item.wrappedStaysFreshFor), dateCreated: item.wrappedInStorageSince))
            .gesture(LongPressGesture()
                .onEnded({ i in
                    self.foodItem = item      // << tapped item
                })
        )
            //TODO: Make a diffrence between eat all and throw away
    }
} // actionSheet attach to parent
.actionSheet(item: self.$foodItem, content: { item in // << activated on item
    ActionSheet(title: Text("More Options"), message: Text("Chose what to do with this food item"), buttons: [
        .default(Text("Eat All"), action: {
            self.managedObjectContext.delete(item)
            try? self.managedObjectContext.save()
        })
        ,.default(Text("Throw Away"), action: {
            self.managedObjectContext.delete(item)
            try? self.managedObjectContext.save()
        })

        ,.default(Text("Cancel"))
    ])
})

核心数据总是删除第一个对象

1 个答案: