the - swift(lenguaje de programación)

¿Cómo puedo encontrar la cantidad de días en un mes y año determinados usando el método swift?

Question

Quiero encontrar el número total de días en un mes y año dados. Ejemplo: quiero encontrar el número total de días en el año = 2015, mes = 7

Answer 1

Swift 3.1 y Xcode 8+

let calendar = Calendar.current
let date = Date()
// Calculate start and end of the current year (or month with `.month`):
let interval = calendar.dateInterval(of: .year, for: date)! //change year it will no of days in a year , change it to month it will give no of days in a current month
// Compute difference in days:
let days = calendar.dateComponents([.day], from: interval.start, to: interval.end).day!
print(days)

Answer 2

Swift 2.0

func getDaysInMonth(month: Int, year: Int) -> Int
{
let calendar = NSCalendar.currentCalendar()
let startComps = NSDateComponents()
startComps.day = 1
startComps.month = month
startComps.year = year
let endComps = NSDateComponents()
endComps.day = 1
endComps.month = month == 12 ? 1 : month + 1
endComps.year = month == 12 ? year + 1 : year
let startDate = calendar.dateFromComponents(startComps)!
let endDate = calendar.dateFromComponents(endComps)!
let diff = calendar.components(NSCalendarUnit.Day, fromDate: startDate, toDate: endDate, options: NSCalendarOptions.MatchFirst)
return diff.day
}
let days = getDaysInMonth(4, year: 2015) // April 2015 has 30 days
print(days) // Prints 30

Swift 1.2

func getDaysInMonth(month: Int, year: Int) -> Int
{
let calendar = NSCalendar.currentCalendar()
let startComps = NSDateComponents()
startComps.day = 1
startComps.month = month
startComps.year = year
let endComps = NSDateComponents()
endComps.day = 1
endComps.month = month == 12 ? 1 : month + 1
endComps.year = month == 12 ? year + 1 : year
let startDate = calendar.dateFromComponents(startComps)!
let endDate = calendar.dateFromComponents(endComps)!
let diff = calendar.components(NSCalendarUnit.CalendarUnitDay, fromDate: startDate, toDate: endDate, options: NSCalendarOptions.allZeros)
return diff.day
}
let days = getDaysInMonth(4, 2015) // There were 30 days in April 2015
println(days) // Prints 30

Answer 3

¿Qué tal un año determinado?

Lo siguiente es imprimir la cantidad de días en el mes de la fecha:

let range = userCalendar.range(of: .day, in: .year, for: Date())!
print("Days In Year: /(range.count)") // prints 31

... y no el número de días en el año de la fecha como se esperaba: /

Answer 4

En formato de extensión, usar self para poder devolver el número de días más dinámicamente (Swift 3).

extension Date {
func getDaysInMonth() -> Int{
let calendar = Calendar.current
let dateComponents = DateComponents(year: calendar.component(.year, from: self), month: calendar.component(.month, from: self))
let date = calendar.date(from: dateComponents)!
let range = calendar.range(of: .day, in: .month, for: date)!
let numDays = range.count
return numDays
}
}

Answer 5

Para obtener el número de días y todas las fechas en un mes y año determinado, intente esto.

func getAllDates(month: Int, year: Int) -> [Date] {
let dateComponents = DateComponents(year: year, month: month)
let calendar = Calendar.current
let date = calendar.date(from: dateComponents)!
let range = calendar.range(of: .day, in: .month, for: date)!
let numDays = range.count
let formatter = DateFormatter()
formatter.dateFormat = "yyyy MM dd"
formatter.timeZone = TimeZone(abbreviation: "GMT+0:00")
var arrDates = [Date]()
for day in 1...numDays {
let dateString = "/(year) /(month) /(day)"
if let date = formatter.date(from: dateString) {
arrDates.append(date)
}
}
return arrDates
}

Uso:

let arrDatesInGivenMonthYear = getAllDates(month: 1, year: 2018)
debugPrint(arrDatesInGivenMonthYear)
//Output: [2018-01-01 00:00:00 +0000, 2018-01-02 00:00:00 +0000, ... , 2018-01-31 00:00:00 +0000]
let numberOfDays = arrDatesInGivenMonthYear.count
debugPrint(numberOfDays)
//Output: 31

Answer 6

Primero crea un NSDate para el año y mes dados:

let dateComponents = NSDateComponents()
dateComponents.year = 2015
dateComponents.month = 7
let calendar = NSCalendar.currentCalendar()
let date = calendar.dateFromComponents(dateComponents)!

Luego, use el método rangeOfUnit() , como se describe en Número de días en el mes actual con el SDK de iPhone. :

// Swift 2:
let range = calendar.rangeOfUnit(.Day, inUnit: .Month, forDate: date)
// Swift 1.2:
let range = calendar.rangeOfUnit(.CalendarUnitDay, inUnit: .CalendarUnitMonth, forDate: date)
let numDays = range.length
print(numDays) // 31

Actualización para Swift 3 (Xcode 8):

let dateComponents = DateComponents(year: 2015, month: 7)
let calendar = Calendar.current
let date = calendar.date(from: dateComponents)!
let range = calendar.range(of: .day, in: .month, for: date)!
let numDays = range.count
print(numDays) // 31