Displaying Calendar Dates in Swift - ios

Question

Im trying to build a weekly calendar for IOS.
The problem with that sample is code is: the usage of an dates array
let dates = ["7/10/2017", "7/11/2017", "7/12/2017", "7/13/2017", "7/14/2017", "7/15/2017", "7/16/2017"]
func spreadsheetView(_ spreadsheetView: SpreadsheetView, cellForItemAt indexPath: IndexPath) -> Cell? {
if case (1...(dates.count + 1), 0) = (indexPath.column, indexPath.row) {
let cell = spreadsheetView.dequeueReusableCell(withReuseIdentifier: String(describing: DateCell.self), for: indexPath) as! DateCell
cell.label.text = dates[indexPath.column - 1]
return cell
Filling that array with real dates from 01.01.2000 - 31.12.2099 e.g. leads to really bad performance of the app.
Does anyone know how to display the current Dates in an more elegant way?

Answer 1

You could do so by using the following extension:
See here : Swift: Print all dates between two NSDate()
extension Date{
func generateDatesArrayBetweenTwoDates(startDate: Date , endDate:Date) ->[Date]
{
var datesArray: [Date] = [Date]()
var startDate = startDate
let calendar = Calendar.current
let fmt = DateFormatter()
fmt.dateFormat = "yyyy-MM-dd"
while startDate <= endDate {
datesArray.append(startDate)
startDate = calendar.date(byAdding: .day, value: 1, to: startDate)!
}
return datesArray
}
}
Usage:
let dates = Date().generateDatesArrayBetweenTwoDates(startDate: Your Start Date Object , endDate: Your End Date Object)

Answer 2

Here's one solution using Calendar enumerateDates:
// 01.01.2000
let startComps = DateComponents(year: 2000, month: 1, day: 1)
let startDate = Calendar.current.date(from: startComps)!
// 31.12.2099
let endComps = DateComponents(year: 2099, month: 12, day: 31)
let endDate = Calendar.current.date(from: endComps)!
let components = DateComponents(hour: 0, minute: 0, second: 0) // midnight
var dates = [startDate]
Calendar.current.enumerateDates(startingAfter: startDate, matching: components, matchingPolicy: .nextTime) { (date, strict, stop) in
if let date = date {
if date <= endDate {
dates.append(date)
} else {
stop = true
}
}
}