我们如何得到一个月的星期日数？（swift）

我们如何得到一个月的星期日数？平均为4天，但我们能否得到一个月内的确切星期日数， 我不知道从哪里开始，所以任何关于计算星期日的逻辑的暗示或任何与此相关的事情都将非常感谢并对我有所帮助

我正在尝试获取给定月份的总天数，我可以通过以下代码实现这一点：

func getNumberOfDaysInMonth (month : Int , Year : Int) -> Int{


    let dateComponents = NSDateComponents()
    dateComponents.year = Year
    dateComponents.month = month

    let calendar = NSCalendar.currentCalendar()
    let date = calendar.dateFromComponents(dateComponents)!

    // Swift 2:
    let range = calendar.rangeOfUnit(.Day, inUnit: .Month, forDate: date)

    let numDays = range.length

    return numDays


}

但我想把一个月的星期日数排除在外

---

谢谢：）

您可以使用第一天的星期几计算星期日数，并从计数中减去：

    func getNumberOfDaysInMonth (month : Int , _ Year : Int) -> Int
{


    var dateComponents = DateComponents()
    dateComponents.year = Year
    dateComponents.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 dow = calendar.component(.weekday, from: date!)
    let sundays = (numDays! + dow) / 7

    return numDays! - sundays


}

---

您可以使用第一天的星期几计算星期日数，并从计数中减去：

    func getNumberOfDaysInMonth (month : Int , _ Year : Int) -> Int
{


    var dateComponents = DateComponents()
    dateComponents.year = Year
    dateComponents.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 dow = calendar.component(.weekday, from: date!)
    let sundays = (numDays! + dow) / 7

    return numDays! - sundays


}

---

我在操场上创建了一个类，以返回一周中的任何一天作为结构。 我想可以使用

枚举日期

。 但是无论如何，还不确定警卫的情况，但是来了

import UIKit

struct CalendarByWeekday {
    var Month = Int()
    var Year = Int()
    var Sundays = [Int]()
    var Mondays = [Int]()
    var Tuesdays = [Int]()
    var Wednesdays = [Int]()
    var Thursdays = [Int]()
    var Fridays = [Int]()
    var Saturdays = [Int]()

}
enum InvalidMonthInput: Error {
    case invalidInput
}


class Calculations {



class func calendar(month:Int ,year: Int) -> CalendarByWeekday {

//MARK: Prevent the input of invalid WeekDay.
    func protectMonth() throws -> Int {
   let monthRange = 1...12
    guard monthRange ~= month
        else {
           print("error")
            throw
            InvalidMonthInput.invalidInput
            //let nilStruct = CalendarByWeekday()
            //return nilStruct
        }
        return month
    }
    do {
        try!protectMonth()

    }

    var results = CalendarByWeekday()
    results.Month = month
    results.Year = year

    //MARK: Set the calendar.

    let calendar = Calendar(identifier: .gregorian)


    //MARK: Get the first day of the month.

    let components = DateComponents.init(calendar: calendar, year: year, month: month, day: 1)
    let firstDayOfTheMonth = calendar.date(from: components)
    let range = calendar.range(of: .day, in: .month, for: firstDayOfTheMonth!)

    //MARK: Get the first weekday of the month.

    let firstWeekdayOfTheMonth = calendar.component(.weekday, from: firstDayOfTheMonth!)

switch firstWeekdayOfTheMonth {
    case 1:
        if range!.count >= 29 {
            results.Sundays = [1,8,15,22,29]
        } else {
            results.Sundays = [1,8,15,22]
        }
        if range!.count >= 30 {
            results.Mondays = [2,9,16,23,30]
        } else {
            results.Mondays = [2,9,16,23]
        }
        if range!.count >= 31 {
            results.Tuesdays   = [3,10,17,24,31]
        } else {
            results.Tuesdays   = [3,10,17,24]
        }
        results.Wednesdays  = [4,11,18,25]
        results.Thursdays  = [5,12,19,26]
        results.Fridays   = [6,13,20,27]
        results.Saturdays  = [7,13,21,28]
    case 2:
        results.Sundays = [7,13,21,28]
        if range!.count >= 29 {
            results.Mondays = [1,8,15,22,29]
        } else {
            results.Mondays = [1,8,15,22]
        }
        if range!.count >= 30 {
            results.Tuesdays   = [2,9,16,23,30]
        } else {
            results.Tuesdays   = [2,9,16,23]
        }
        if range!.count >= 31 {
            results.Wednesdays  = [3,10,17,24,31]
        } else {
            results.Wednesdays  = [3,10,17,24]
        }
        results.Thursdays  = [4,11,18,25]
        results.Fridays   = [5,12,19,26]
        results.Saturdays  = [6,13,20,27]
    case 3:
        results.Sundays = [6,13,20,27]
        results.Mondays = [7,13,21,28]
        if range!.count >= 29 {
            results.Tuesdays   = [1,8,15,22,29]
        } else {
            results.Tuesdays   = [1,8,15,22]
        }
        if range!.count >= 30 {
            results.Wednesdays  = [2,9,16,23,30]
        } else {
            results.Wednesdays  = [2,9,16,23]
        }
        if range!.count >= 31 {
            results.Thursdays  = [3,10,17,24,31]
        } else {
            results.Thursdays  = [3,10,17,24]
        }
        results.Fridays   = [4,11,18,25]
        results.Saturdays  = [5,12,19,26]
    case 4:
        results.Sundays = [5,12,19,26]
        results.Mondays = [6,13,20,27]
        results.Tuesdays   = [7,13,21,28]
        if range!.count >= 29 {
            results.Wednesdays  = [1,8,15,22,29]
        } else {
            results.Wednesdays  = [1,8,15,22]
        }
        if range!.count >= 30 {
            results.Thursdays  = [2,9,16,23,30]
        } else {
            results.Thursdays  = [2,9,16,23]
        }
        if range!.count >= 31 {
            results.Fridays   = [3,10,17,24,31]
        } else {
            results.Fridays   = [3,10,17,24]
        }
        results.Saturdays  = [4,11,18,25]
    case 5:
        results.Sundays = [4,11,18,25]
        results.Mondays = [5,12,19,26]
        results.Tuesdays   = [6,13,20,27]
        results.Wednesdays  = [7,13,21,28]
        if range!.count >= 29 {
            results.Thursdays  = [1,8,15,22,29]
        } else {
            results.Thursdays  = [1,8,15,22]
        }
        if range!.count >= 30 {
            results.Fridays   = [2,9,16,23,30]
        } else {
            results.Fridays   = [2,9,16,23]
        }
        if range!.count >= 31 {
            results.Saturdays  = [3,10,17,24,31]
        } else {
            results.Saturdays  = [3,10,17,24]
        }
    case 6:
        if range!.count >= 31 {
            results.Sundays = [3,10,17,24,31]
        } else {
            results.Sundays = [3,10,17,24]
        }
        results.Mondays = [4,11,18,25]
        results.Tuesdays   = [5,12,19,26]
        results.Wednesdays  = [6,13,20,27]
        results.Thursdays  = [7,13,21,28]
        if range!.count >= 29 {
            results.Fridays   = [1,8,15,22,29]
        } else {
            results.Fridays   = [1,8,15,22]
        }

        if range!.count >= 30 {
            results.Saturdays  = [2,9,16,23,30]
        } else {
            results.Saturdays  = [2,9,16,23]
        }
    case 7:
        if range!.count >= 30 {
            results.Sundays = [2,9,16,23,30]
        } else {
            results.Sundays = [2,9,16,23]
        }
        if range!.count >= 31 {
            results.Mondays = [3,10,17,24,31]
        } else {
            results.Mondays = [3,10,17,24]
        }
        results.Tuesdays   = [4,11,18,25]
        results.Wednesdays  = [5,12,19,26]
        results.Thursdays  = [6,13,20,27]
        results.Fridays   = [7,13,21,28]
        results.Saturdays  = [1,8,15,22,29]
    default:
        print("error")
    }

    return results
}

}

let date = Date()
let myteste = Calculations.calendar(month: 2, year: 2018)

---

我猜你可以创建一个常量，只排除星期天，然后使用它

我在操场上创建了一个类，将一周中的任何一天作为结构返回。 我想可以使用

枚举日期

。 但是无论如何，还不确定警卫的情况，但是来了

import UIKit

struct CalendarByWeekday {
    var Month = Int()
    var Year = Int()
    var Sundays = [Int]()
    var Mondays = [Int]()
    var Tuesdays = [Int]()
    var Wednesdays = [Int]()
    var Thursdays = [Int]()
    var Fridays = [Int]()
    var Saturdays = [Int]()

}
enum InvalidMonthInput: Error {
    case invalidInput
}


class Calculations {



class func calendar(month:Int ,year: Int) -> CalendarByWeekday {

//MARK: Prevent the input of invalid WeekDay.
    func protectMonth() throws -> Int {
   let monthRange = 1...12
    guard monthRange ~= month
        else {
           print("error")
            throw
            InvalidMonthInput.invalidInput
            //let nilStruct = CalendarByWeekday()
            //return nilStruct
        }
        return month
    }
    do {
        try!protectMonth()

    }

    var results = CalendarByWeekday()
    results.Month = month
    results.Year = year

    //MARK: Set the calendar.

    let calendar = Calendar(identifier: .gregorian)


    //MARK: Get the first day of the month.

    let components = DateComponents.init(calendar: calendar, year: year, month: month, day: 1)
    let firstDayOfTheMonth = calendar.date(from: components)
    let range = calendar.range(of: .day, in: .month, for: firstDayOfTheMonth!)

    //MARK: Get the first weekday of the month.

    let firstWeekdayOfTheMonth = calendar.component(.weekday, from: firstDayOfTheMonth!)

switch firstWeekdayOfTheMonth {
    case 1:
        if range!.count >= 29 {
            results.Sundays = [1,8,15,22,29]
        } else {
            results.Sundays = [1,8,15,22]
        }
        if range!.count >= 30 {
            results.Mondays = [2,9,16,23,30]
        } else {
            results.Mondays = [2,9,16,23]
        }
        if range!.count >= 31 {
            results.Tuesdays   = [3,10,17,24,31]
        } else {
            results.Tuesdays   = [3,10,17,24]
        }
        results.Wednesdays  = [4,11,18,25]
        results.Thursdays  = [5,12,19,26]
        results.Fridays   = [6,13,20,27]
        results.Saturdays  = [7,13,21,28]
    case 2:
        results.Sundays = [7,13,21,28]
        if range!.count >= 29 {
            results.Mondays = [1,8,15,22,29]
        } else {
            results.Mondays = [1,8,15,22]
        }
        if range!.count >= 30 {
            results.Tuesdays   = [2,9,16,23,30]
        } else {
            results.Tuesdays   = [2,9,16,23]
        }
        if range!.count >= 31 {
            results.Wednesdays  = [3,10,17,24,31]
        } else {
            results.Wednesdays  = [3,10,17,24]
        }
        results.Thursdays  = [4,11,18,25]
        results.Fridays   = [5,12,19,26]
        results.Saturdays  = [6,13,20,27]
    case 3:
        results.Sundays = [6,13,20,27]
        results.Mondays = [7,13,21,28]
        if range!.count >= 29 {
            results.Tuesdays   = [1,8,15,22,29]
        } else {
            results.Tuesdays   = [1,8,15,22]
        }
        if range!.count >= 30 {
            results.Wednesdays  = [2,9,16,23,30]
        } else {
            results.Wednesdays  = [2,9,16,23]
        }
        if range!.count >= 31 {
            results.Thursdays  = [3,10,17,24,31]
        } else {
            results.Thursdays  = [3,10,17,24]
        }
        results.Fridays   = [4,11,18,25]
        results.Saturdays  = [5,12,19,26]
    case 4:
        results.Sundays = [5,12,19,26]
        results.Mondays = [6,13,20,27]
        results.Tuesdays   = [7,13,21,28]
        if range!.count >= 29 {
            results.Wednesdays  = [1,8,15,22,29]
        } else {
            results.Wednesdays  = [1,8,15,22]
        }
        if range!.count >= 30 {
            results.Thursdays  = [2,9,16,23,30]
        } else {
            results.Thursdays  = [2,9,16,23]
        }
        if range!.count >= 31 {
            results.Fridays   = [3,10,17,24,31]
        } else {
            results.Fridays   = [3,10,17,24]
        }
        results.Saturdays  = [4,11,18,25]
    case 5:
        results.Sundays = [4,11,18,25]
        results.Mondays = [5,12,19,26]
        results.Tuesdays   = [6,13,20,27]
        results.Wednesdays  = [7,13,21,28]
        if range!.count >= 29 {
            results.Thursdays  = [1,8,15,22,29]
        } else {
            results.Thursdays  = [1,8,15,22]
        }
        if range!.count >= 30 {
            results.Fridays   = [2,9,16,23,30]
        } else {
            results.Fridays   = [2,9,16,23]
        }
        if range!.count >= 31 {
            results.Saturdays  = [3,10,17,24,31]
        } else {
            results.Saturdays  = [3,10,17,24]
        }
    case 6:
        if range!.count >= 31 {
            results.Sundays = [3,10,17,24,31]
        } else {
            results.Sundays = [3,10,17,24]
        }
        results.Mondays = [4,11,18,25]
        results.Tuesdays   = [5,12,19,26]
        results.Wednesdays  = [6,13,20,27]
        results.Thursdays  = [7,13,21,28]
        if range!.count >= 29 {
            results.Fridays   = [1,8,15,22,29]
        } else {
            results.Fridays   = [1,8,15,22]
        }

        if range!.count >= 30 {
            results.Saturdays  = [2,9,16,23,30]
        } else {
            results.Saturdays  = [2,9,16,23]
        }
    case 7:
        if range!.count >= 30 {
            results.Sundays = [2,9,16,23,30]
        } else {
            results.Sundays = [2,9,16,23]
        }
        if range!.count >= 31 {
            results.Mondays = [3,10,17,24,31]
        } else {
            results.Mondays = [3,10,17,24]
        }
        results.Tuesdays   = [4,11,18,25]
        results.Wednesdays  = [5,12,19,26]
        results.Thursdays  = [6,13,20,27]
        results.Fridays   = [7,13,21,28]
        results.Saturdays  = [1,8,15,22,29]
    default:
        print("error")
    }

    return results
}

}

let date = Date()
let myteste = Calculations.calendar(month: 2, year: 2018)

---

我猜你可以创建一个常量，只排除星期天并使用它

hey@Shades，因为有

if dayOfWeek==“Sunday”

如果用户将他们的语言设置为西班牙语，那么你的检查将失败，否？@remyboys我对语言选择一无所知，但我的直觉是怀疑它。代码本身是英文的，我想它在准备打印之前是不会翻译的。但我真的不知道，我建议

让date2=calendar.date（from:dateComponents作为dateComponents）；如果calendar.component（.weekday，from:date2！）==1{numberOfSundays+=1；让dateThu=thuFormatter.string（from:date2！）；dateArray.append（dateThu）}

而不是使用

NSDateFormatter

和字符串比较，它们可能会随着语言的不同而变化。嘿@Shades，因为如果dayOfWeek==Sunday，就有

如果用户将其语言设置为西班牙语，那么您的检查将失败，否？@remyboys我对语言选择一无所知，但我的直觉是怀疑这一点。代码本身是英文的，我想它在准备打印之前是不会翻译的。但我真的不知道，我建议

让date2=calendar.date（from:dateComponents作为dateComponents）；如果calendar.component（.weekday，from:date2！）==1{numberOfSundays+=1；让dateThu=thuFormatter.string（from:date2！）；dateArray.append（dateThu）}

而不是使用

NSDateFormatter

和可能根据语言而改变的字符串比较。链接到Enumeratedate使用的讨论链接到Enumeratedate使用的讨论