How do i display CoreData data from the past week or month? - swift

Question

I have data saved as meals; Breakfast, Lunch, Dinner and Snacks. I am trying to return a total for the calories from all meals for each day over the previous week.
The meal data is saved as below with .date :
func saveBreakfast() {
let newBreakfastItem = BreakfastItem(context: self.moc)
newBreakfastItem.id = UUID()
newBreakfastItem.name = self.item.name
newBreakfastItem.calories = Int32(self.totalCalories)
newBreakfastItem.carbs = Int32(self.totalCarbs)
newBreakfastItem.protein = Int32(self.totalProtein)
newBreakfastItem.fat = Int32(self.totalFats)
newBreakfastItem.date = self.dateAdded
do {
if self.mocB.hasChanges { // saves only if changes are made
try? self.mocB.save()
}
}
}
func saveLunch() {
let newLunchItem = LunchItem(context: self.moc)
newLunchItem.id = UUID()
newLunchItem.name = self.item.name
newLunchItem.calories = Int32(self.caloriesPerServing)
newLunchItem.carbs = Int32(self.carbsPerServing)
newLunchItem.protein = Int32(self.proteinPerServing)
newLunchItem.fat = Int32(self.fatsPerServing)
newLunchItem.date = self.dateAdded
do {
if self.mocL.hasChanges {
try? self.mocL.save()
}
}
}
I am currently working with the below function to try and get it working for a single day (Date() - 1 day, so yesterday)
func dayOneCal(at date: Date) -> NSNumber {
let request1:NSFetchRequest<BreakfastItem> = BreakfastItem.fetchRequest() as! NSFetchRequest<BreakfastItem>
let request2:NSFetchRequest<LunchItem> = LunchItem.fetchRequest() as! NSFetchRequest<LunchItem>
let request3:NSFetchRequest<DinnerItem> = DinnerItem.fetchRequest() as! NSFetchRequest<DinnerItem>
let request4:NSFetchRequest<SnackItem> = SnackItem.fetchRequest() as! NSFetchRequest<SnackItem>
let startDate = Calendar.current.startOfDay(for: date)
var components = DateComponents()
components.day = -1
components.second = -1
let endDate = Calendar.current.date(byAdding: components, to: startDate)!
request1.predicate = NSPredicate(format: "date >= %# AND date <= %#", startDate as NSDate, endDate as NSDate)
request2.predicate = NSPredicate(format: "date >= %# AND date <= %#", startDate as NSDate, endDate as NSDate)
request3.predicate = NSPredicate(format: "date >= %# AND date <= %#", startDate as NSDate, endDate as NSDate)
request4.predicate = NSPredicate(format: "date >= %# AND date <= %#", startDate as NSDate, endDate as NSDate)
let totalDailyBreakfastCals = BreakfastItems.map({$0.calories}).reduce(0, +)
let totalDailyLunchCals = LunchItems.map({$0.calories}).reduce(0, +)
let totalDailyDinnerCals = DinnerItems.map({$0.calories}).reduce(0, +)
let totalDailySnacksCals = SnackItems.map({$0.calories}).reduce(0, +)
let totalDailyCals = totalDailyBreakfastCals + totalDailyLunchCals + totalDailyDinnerCals + totalDailySnacksCals
return totalDailyCals as NSNumber
}
Any help would be greatly appreciated, thank you in advance!