Check Same Dates Inside ForEach Swift - swift

Question

How can I check if item 1 date is equal to item 2 date inside the foreach. Can I check the same dates inside the predicate like below without using 2 foreach loops?
struct TimedView: View {
static let taskDateFormat: DateFormatter = {
let formatter = DateFormatter()
formatter.dateStyle = .long
return formatter
}()
#State var releaseDate = Date()
#Environment(\.managedObjectContext) private var viewContext
#FetchRequest var reminder: FetchedResults<CDReminder>
init(){
var calendar = Calendar.current
calendar.timeZone = NSTimeZone.local
let dateFrom = calendar.startOfDay(for: Date()) // eg. 2016-10-10 00:00:00
let dateTo = calendar.date(byAdding: .day, value: 1, to: dateFrom)
let predicate = NSPredicate(format : "date >= %# AND date == %#", dateFrom as CVarArg)
self._reminder = FetchRequest(
entity: CDReminder.entity(),
sortDescriptors: [NSSortDescriptor(keyPath: \CDReminder.date, ascending: false)],
predicate: predicate)
}
var body: some View {
NavigationView {
VStack{
HStack{
Text("Zamanlanmis")
.font(.system(size: 40, weight: .bold, design: .rounded))
.foregroundColor(.red)
Spacer()
}
.padding(.leading)
List{
ForEach(reminder, id: \.self) { item in
DatedReminderCell(reminder: item, isSelected: false, onComplete: {})
.foregroundColor(.black)
}
}
}
}
}
Now my output is coming like this

Answer 1

Date objects are only equal if they represent the exact same instant, down to the fraction of a second.
If you want to see if a date falls on a give month/day/year, you will need to use a Calendar object to generate beginning_of_day and end_of_day dates and see if each date fall between them.
This thread includes several examples of that. Most of the code is in Objective-C but it should be pretty easy to translate the approach to Swift, if not the exact code.

Answer 2

To solve this complex problem I created a helper file called ScheduledViewHelper. Inside this helper, I have created a new array that has two elements(reminder and date). Inside this helper first I fetched all the reminders from core data then I compared all their date data and when I find a new date I append the date element inside the array. Finally, I sorted those dates and return [ReminderList] to be able to get this array from my ScheduledView.
My ScheduledViewHelper is
public struct ReminderList: Hashable {
let date: String
let reminder: [CDReminder]
}
open class ScheduledViewHelper: NSObject {
public static let shared = ScheduledViewHelper()
private let viewContext = PersistenceController.shared.container.viewContext
private override init() {
super.init()
}
private func getReminders() -> [CDReminder] {
let request: NSFetchRequest<CDReminder> = CDReminder.fetchRequest()
do {
let items = try viewContext.fetch(request) as [CDReminder]
return items
} catch {
print("Error occured: ", error)
}
return []
}
public func getScheduledData() -> [ReminderList] {
let calendar = Calendar.current
var list: [ReminderList] = []
var dateList: [String] = []
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "dd/MM/yyyy"
let reminders = getReminders()
reminders.forEach { (reminder) in
let date = dateFormatter.string(from: reminder.date!)
if !dateList.contains(date) && date >= dateFormatter.string(from: Date()) {
dateList.append(date)
}
}
dateList.forEach { (date) in
let dateFrom = calendar.startOfDay(for: dateFormatter.date(from: date)!) // eg. 2016-10-10 00:00:00
let dateTo = calendar.date(byAdding: .day, value: 1, to: dateFrom)
let predicate = NSPredicate(format: "date <= %# AND date >= %#", dateTo! as NSDate, dateFrom as NSDate)
let request: NSFetchRequest<CDReminder> = CDReminder.fetchRequest()
request.predicate = predicate
do {
let items = try viewContext.fetch(request) as [CDReminder]
let newItem = ReminderList(date: date, reminder: items)
list.append(newItem)
} catch {
print("Error occured: ", error)
}
}
return list.sorted {
$0.date < $1.date
}
}
private func saveContext() {
do {
try viewContext.save()
} catch {
print("Error occured: ", error)
}
}
}
I added to my ScheduledView those lines:
created a new var before init() statement
#State var remindersList : [ReminderList] = []
just under NavigationView I initialized remindersList with onAppear
.onAppear {
remindersList = ScheduledViewHelper.shared.getScheduledData()
}
Reorganized my List like this
List{
ForEach(remindersList, id: .self) { item in
VStack(alignment: .leading) {
Text(item.date)
ForEach(item.reminder, id: .self) { reminder in
DatedReminderCell(reminder: reminder, isSelected: false, onComplete: {})
}
}
.foregroundColor(.black)
}
}