NSDate - Returning the closest hour - ios

Question

I want to create a project where:
I create a task to do.
I create a stoping date for this task
I create three reminders using date picker
This I've done already. But now, I want the label to return for me the hour of the closest reminder (but I want the label to do this until the stoping date)
What I accomplish already is a playground project:
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm"
let currentDate = dateFormatter.dateFromString("2016-01-03 16:30")
var firstDate = dateFormatter.dateFromString("2016-01-03 13:00")
var secondDate = dateFormatter.dateFromString("2016-01-03 16:00")
var thirdDate = dateFormatter.dateFromString("2016-01-03 17:00")
var datesArray = [firstDate, secondDate, thirdDate]
let firstInterval = firstDate?.timeIntervalSinceDate(currentDate!)
let secondInterval = secondDate?.timeIntervalSinceDate(currentDate!)
let thirdInterval = thirdDate?.timeIntervalSinceDate(currentDate!)
let intervalArray = [firstInterval, secondInterval, thirdInterval]
var aboveZeroIntervals = [NSTimeInterval]()
for interval in intervalArray {
if interval > 0 {
aboveZeroIntervals.append(interval!)
}
}
//print(aboveZeroIntervals)
for date in datesArray {
if date?.timeIntervalSinceDate(currentDate!) == aboveZeroIntervals.minElement() {
print(dateFormatter.stringFromDate(date!))
}
}
How to get only hours from first/second/thirdDate and display the hour from those three dates that is the closest to currentDate hour? And perfectly finish displaying it after currentDate exceeds stopDoingDate...
I came up with something like this (code below). Can anyone look at it and tell me if there is some way I can simplify this?
extension NSDate
{
func isGreaterThanDate(dateToCompare : NSDate) -> Bool
{
//Declare Variables
var isGreater = false
//Compare Values
if self.compare(dateToCompare) == NSComparisonResult.OrderedDescending
{
isGreater = true
}
//Return Result
return isGreater
}
}
let calendar = NSCalendar.currentCalendar()
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm"
let currentDate = dateFormatter.dateFromString("2016-01-04 16:30")
let stopDoingDate = dateFormatter.dateFromString("2016-01-06 15:00")
if stopDoingDate!.isGreaterThanDate(currentDate!) {
let currentDateComponents = calendar.components([.Year, .Month, .Day, .Hour, .Minute], fromDate: currentDate!)
currentDateComponents.hour
currentDateComponents.minute
let dateTimeFormatter = NSDateFormatter()
dateTimeFormatter.dateFormat = "HH:mm"
let currentOnlyTime = dateTimeFormatter.dateFromString("\(currentDateComponents.hour):\(currentDateComponents.minute)")
var firstDate = dateFormatter.dateFromString("2016-01-03 13:00")
var firstDateComponents = calendar.components([.Hour, .Minute], fromDate: firstDate!)
var firstDateTime = dateTimeFormatter.dateFromString("\(firstDateComponents.hour):\(firstDateComponents.minute)")
var secondDate = dateFormatter.dateFromString("2016-01-03 16:00")
var secondDateComponents = calendar.components([.Hour, .Minute], fromDate: secondDate!)
var secondDateTime = dateTimeFormatter.dateFromString("\(secondDateComponents.hour):\(secondDateComponents.minute)")
var thirdDate = dateFormatter.dateFromString("2016-01-03 17:00")
var thirdDateComponents = calendar.components([.Hour, .Minute], fromDate: thirdDate!)
var thirdDateTime = dateTimeFormatter.dateFromString("\(thirdDateComponents.hour):\(thirdDateComponents.minute)")
var datesArray = [firstDateTime, secondDateTime, thirdDateTime]
let firstInterval = firstDateTime?.timeIntervalSinceDate(currentOnlyTime!)
let secondInterval = secondDateTime?.timeIntervalSinceDate(currentOnlyTime!)
let thirdInterval = thirdDateTime?.timeIntervalSinceDate(currentOnlyTime!)
let intervalArray = [firstInterval, secondInterval, thirdInterval]
var aboveZeroIntervals = [NSTimeInterval]()
for interval in intervalArray {
if interval > 0 {
aboveZeroIntervals.append(interval!)
}
}
//print(aboveZeroIntervals)
for date in datesArray {
if date?.timeIntervalSinceDate(currentOnlyTime!) == aboveZeroIntervals.minElement() {
let dateTime = calendar.components([.Hour, .Minute], fromDate: date!)
print(dateFormatter.dateFromString("\(currentDateComponents.year)-\(currentDateComponents.month)-\(currentDateComponents.day) \(dateTime.hour):\(dateTime.minute)")!)
print("Next todo hour is: \(dateTime.hour): \(dateTime.minute)")
}
}
} else {
print("Todo DONE")
}

Answer 1

I came up with this:
The only problem is to generate array of dates from currentDate to stopDoingDate but I will handle this alone (and probably post a solution here as well)
I used one of this forum post to generate extension to NSDate:
extension NSDate
{
func isGreaterThanDate(dateToCompare : NSDate) -> Bool
{
//Declare Variables
var isGreater = false
//Compare Values
if self.compare(dateToCompare) == NSComparisonResult.OrderedDescending
{
isGreater = true
}
//Return Result
return isGreater
}
}
//let calendar = NSCalendar.currentCalendar()
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm"
let currentDate = dateFormatter.dateFromString("2016-01-04 14:00")!
let stopDoingDate = dateFormatter.dateFromString("2016-01-06 16:00")!
let date1 = dateFormatter.dateFromString("2016-01-04 09:00")
let date2 = dateFormatter.dateFromString("2016-01-04 15:00")
let date3 = dateFormatter.dateFromString("2016-01-05 09:00")
let date4 = dateFormatter.dateFromString("2016-01-05 15:00")
let date5 = dateFormatter.dateFromString("2016-01-06 09:00")
let date6 = dateFormatter.dateFromString("2016-01-06 15:00")
var dates: [NSDate] = [date1!, date2!, date3!, date6!, date5!, date4!]
if stopDoingDate.isGreaterThanDate(currentDate) {
var datesAfterCurrentDate = [NSDate]()
for date in dates {
if date.isGreaterThanDate(currentDate) {
datesAfterCurrentDate.append(date)
}
}
let sortedDatesAfterCurrentDate = datesAfterCurrentDate.sort({ $0.timeIntervalSince1970 < $1.timeIntervalSince1970 })
let dateToDisplay = sortedDatesAfterCurrentDate.first!
let timeFormatter = NSDateFormatter()
timeFormatter.timeStyle = .ShortStyle
print(timeFormatter.stringFromDate(dateToDisplay)) } else {
print("We are done here")
}
This forum is truly awesome! Thanks Leo Dabus for the simple idea!