IOS Count current streak of days - ios

Question

I'm making a day streak counter using UserDefaults and Core Data.
The idea is that a number will be added unto by 1 every separate day an action is performed-- this will be the streak number.
If this action wasn't performed for 24 hours, the number would reset to zero.
I have a function to set the end of the streak:
// set date time to the end of the day so the user has 24hrs to add to the streak
func changeDateTime(userDate: NSDate) -> NSDate {
let dateComponents = NSDateComponents()
let currentCalendar = NSCalendar.current
let year = Int(currentCalendar.component(NSCalendar.Unit.Year, fromDate:
userDate))
let month = Int(currentCalendar.component(NSCalendar.Unit.Month, fromDate:
userDate))
let day = Int(currentCalendar.component(NSCalendar.Unit.Day, fromDate: userDate))
dateComponents.year = year
dateComponents.month = month
dateComponents.day = day
dateComponents.hour = 23
dateComponents.minute = 59
dateComponents.second = 59
guard let returnDate = currentCalendar.dateFromComponents(dateComponents) else {
return userDate
}
return returnDate
}
It is returning the following Errors:
'NSDate' is not implicitly convertible to 'Date'; did you mean to use
'as' to explicitly convert?
Cannot convert value of type 'NSCalendar.Unit' to expected argument
type 'Calendar.Component'
When using the suggested corrections I only get more errors with no suggested corrections. I'm having trouble figuring out the proper way to express this
The full Code is:
let userDefaults = UserDefaults.standard
var moc: NSManagedObjectContext!
var lastStreakEndDate: NSDate!
var streakTotal: Int!
override func viewDidLoad() {
super.viewDidLoad()
// checks for object if nil creates one (used for first run)
if userDefaults.object(forKey: "lastStreakEndDate") == nil {
userDefaults.set(NSDate(), forKey: "lastStreakEndDate")
}
lastStreakEndDate = (userDefaults.object(forKey: "lastStreakEndDate") as! NSDate)
streakTotal = calculateStreak(lastDate: lastStreakEndDate)
}
// fetches dates since last streak
func fetchLatestDates(moc: NSManagedObjectContext, lastDate: NSDate) -> [NSDate] {
var dates = [NSDate]()
let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "streakCount")
let datePredicate = NSPredicate(format: "date < %#", lastDate)
fetchRequest.predicate = datePredicate
do {
let result = try moc.fetch(fetchRequest)
let allDates = result as! [NSDate]
if allDates.count > 0 {
for date in allDates {
dates.append(date)
}
}
} catch {
fatalError()
}
return dates
}
// set date time to the end of the day so the user has 24hrs to add to the streak
func changeDateTime(userDate: NSDate) -> NSDate {
let dateComponents = NSDateComponents()
let currentCalendar = NSCalendar.current
let year = Int(currentCalendar.component(NSCalendar.Unit.Year, fromDate: userDate))
let month = Int(currentCalendar.component(NSCalendar.Unit.Month, fromDate: userDate))
let day = Int(currentCalendar.component(NSCalendar.Unit.Day, fromDate: userDate))
dateComponents.year = year
dateComponents.month = month
dateComponents.day = day
dateComponents.hour = 23
dateComponents.minute = 59
dateComponents.second = 59
guard let returnDate = currentCalendar.dateFromComponents(dateComponents) else {
return userDate
}
return returnDate
}
// adds a day to the date
func addDay(today: NSDate) -> NSDate {
let tomorrow = NSCalendar.currentCalendar.dateByAddingUnit(.Day, value: 1, toDate: today, options: NSCalendar.Options(rawValue: 0))
return tomorrow!
}
// this method returns the total of the streak and sets the ending date of the last streak
func calculateStreak(lastDate: NSDate) -> Int {
let dateList = fetchLatestDates(moc: moc, lastDate: lastDate)
let compareDate = changeDateTime(userDate: lastDate)
var streakDateList = [NSDate]()
var tomorrow = addDay(today: compareDate)
for date in dateList {
changeDateTime(userDate: date)
if date == tomorrow {
streakDateList.append(date)
}
tomorrow = addDay(today: tomorrow)
}
userDefaults.set(streakDateList.last, forKey: "lastStreakEndDate")
return streakDateList.count
}
Any Help is Appreciated

Answer 1

You need
// set date time to the end of the day so the user has 24hrs to add to the streak
func changeDateTime(userDate: Date) -> Date {
var dateComponents = DateComponents()
let currentCalendar = Calendar.current
let year = Int(currentCalendar.component(.year, from:
userDate))
let month = Int(currentCalendar.component(.month, from:
userDate))
let day = Int(currentCalendar.component(.day, from: userDate))
dateComponents.year = year
dateComponents.month = month
dateComponents.day = day
dateComponents.hour = 23
dateComponents.minute = 59
dateComponents.second = 59
guard let returnDate = currentCalendar.date(from:dateComponents) else {
return userDate
}
return returnDate
}
OR shortly
// set date time to the end of the day so the user has 24hrs to add to the streak
func changeDateTime(userDate: Date) -> Date {
var dateComponents = DateComponents()
let currentCalendar = Calendar.current
let res = currentCalendar.dateComponents([.year,.month,.day],from:userDate)
dateComponents.year = res.year
dateComponents.month = res.month
dateComponents.day = res.day
dateComponents.hour = 23
dateComponents.minute = 59
dateComponents.second = 59
guard let returnDate = currentCalendar.date(from:dateComponents) else {
return userDate
}
return returnDate
}