30 Min Time Increments not working in Swift - swift

Question

I am having issues getting my code to work. I am trying to create 30 minutes slots in Swift, but it seems to randomly jump an hour every so often. See code below:
let calendar = Calendar.current
var hour = 07
var hour2 = 07
var minute = 0
var timeLoop = 1
var startDate = calendar.date(bySettingHour: hour, minute: 0, second: 0, of: editedDate)
var endDate = calendar.date(bySettingHour: hour2, minute: 0, second: 0, of: editedDate)
repeat {
if(timeLoop % 2 == 0){
startDate = calendar.date(bySettingHour: hour2, minute: 30, second: 0, of: editedDate)
endDate = calendar.date(bySettingHour: hour, minute: 0, second: 0, of: editedDate)
}
else {
startDate = calendar.date(bySettingHour: hour2, minute: 0, second: 0, of: editedDate)
endDate = calendar.date(bySettingHour: hour2, minute: 30, second: 0, of: editedDate)
}
if (timeLoop == 1) {
startDate = calendar.date(bySettingHour: hour, minute: 0, second: 0, of: editedDate)
endDate = calendar.date(bySettingHour: hour, minute: 30, second: 0, of: editedDate)
}
let eventDate = EventDate()
eventDate.startDate = startDate!
eventDate.endDate = endDate!
self.suggestedDates.append(eventDate)
self.suggestedDates.sort(by: {$0.startDate < $1.startDate}) //Recheck this
//Only need to add this once for day purposes
if (hour == 07) {
self.allDayDates.append(eventDate)
self.allDayDates.sort(by: {$0.startDate < $1.startDate}) //Recheck this
}
//update hours
hour2 = hour
hour += 1
timeLoop += 1
} while hour <= 21
This gives the following results
07:00 - 07:30,
07:30 - 08:00,
08:00 - 08:30,
09:30 - 10:00,
10:00 - 10:30,
11:30 - 12:00,
12:00 - 12:30,
13:30 - 14:00,
As you can see theres a jump from 10:30 to 11:30.

Answer 1

Your code does not give enough idea of what you are trying to do.
However to get the time slots you can do something like this:
let calendar = Calendar.current
let startHour = 07 // Hour from where you want to start the slots
var hourCounter = 07 // Hour counter for looping
let slotDuration = 30 // Constant for duration of slots
let editedDate = Date() // The selected date, as per your code
// Create the start date by setting hour value to the `startHour` of `editedDate`
var startDate = calendar.date(bySettingHour: startHour, minute: 0, second: 0, of: editedDate)
// Assign the same value to endDate as the initial value
var endDate = startDate
repeat {
// Assign the end date to the start date,
// This will get you the slot start duration from earlier slot's end date
// For example,
// If this is the starting slot,
// then the startDate and endDate will be same, as per above code.
// If this is any subsequent slot,
// then the slot should start from the last slot's endDate.
// i.e. if previous slot was 01:30 - 2:00,
// then current slot should start from 2:00.
startDate = endDate
if let date = startDate {
// Get the new endDate by adding your slot duration to the startDate
endDate = calendar.date(byAdding: .minute, value: slotDuration, to: date)
}
// ...
// Do whatever you want to do with these slot values here...
// ...
// Increment the counter for looping
hourCounter += 1
} while hourCounter <= 21
The code generates time slots based on the slot duration. You can change the slotDuration to any desired value (in minute), and it will generate slots accordingly. Try changing it from 30 to 15 and see the results.