add a new row in tableView every single month - swift

Question

i have a date say 2 March 2016 stored as NSUserDefaults and i want to add a new row in TableView every time a new Month is about to come , so what should i do for accomplishing this , IMO comparing the stored Date and Current Date and if
in Curent Date a new Month is about to come in next 7 days then add the
row into table but i don't know where to start, anyone can give me some hint for checking current date's next 7 days for if a new months is about to come
and if my approach is not good enough then please correct me it'll be so appreciated by me and helpful for me
please see example for better understanding :
storedDate = 2 March 2016
currentDate = 26 March 2016
if CurrentDate + 1 Week == newMonth {
//add the Row into TableView
}

Answer 1

You can add an Extension to NSDate and then do all sorts of day/month addition
This method you can use to add 7 days to the current date...
func dateByAddingDays(daysToAdd: Int)-> NSDate {
let dateComponents = NSDateComponents()
dateComponents.day = daysToAdd
let newDate = NSCalendar.currentCalendar().dateByAddingComponents(dateComponents, toDate: self, options: .MatchFirst)
return newDate!
}
This method to add months to current date
func dateByAddingMonths(monthsToAdd: Int)-> NSDate {
let dateComponents = NSDateComponents()
dateComponents.month = monthsToAdd
let newDate = NSCalendar.currentCalendar().dateByAddingComponents(dateComponents, toDate: self, options: .MatchFirst)
return newDate!
}
Then you need to check that date you created and see if it its a different month than the one that is stored..
func compareMonths(newDate:NSDate)-> Bool {
let today = NSDate()
let todayPlusSeven = today.dateByAddingDays(7)
return todayPlusSeven.isNextMonth(storedDate)
}
Using this method to check if the months of 2 dates are the same
func isNextMonth(storedDate: NSDate)-> Bool {
return isSameMonthAsDate(storedDate.dateByAddingMonth(1))
}
func isSameMonthAsDate(compareDate: NSDate)-> Bool {
let comp1 = NSCalendar.currentCalendar().components([NSCalendarUnit.Year, NSCalendarUnit.Month], fromDate: self)
let comp2 = NSCalendar.currentCalendar().components([NSCalendarUnit.Year, NSCalendarUnit.Month], fromDate: compareDate)
return ((comp1.month == comp2.month) && (comp1.year == comp2.year))
}
An oldie but still goodie, is this page of Date helpers from Erica Sadun's github page here They are all in Obj-c but can be converted to swift easily enough. I still reference it when i need help doing date math