获取上周六和周日的上周，下周和下周 [英] Get Previous, Current and Next Weeks Excluding Saturday and Sunday

问题描述

我想显示从星期一到星期五的日期/天，不包括星期六/星期日，如下图所示。

I wants to display dates/days from Monday to Friday excluding Saturday/Sunday as mentioned in the image below.

我的情景：

1. 当屏幕加载时，应显示当前周。


2. 点击上一个按钮（ DisplayedWeek - 1 ）


3. 点击下一步按钮（ DisplayedWeek + 1 ）。

1. When screen loads the current week should display.
2. On previous button click (DisplayedWeek - 1)
3. On Next button click (DisplayedWeek + 1).

我的工作，

经过一番研究后，这就是我的尝试。

After some research this is what i have tried.

        let calendar = Calendar.current

        let currentDate = calendar.startOfDay(for: Date())

        /* value =  0 for current,
           value =  1 for next,
           value = -1 for previous week.

        */
        let nextWeek:Date =  calendar.date(byAdding: .weekOfMonth, value: 1, to: currentDate)! as Date

        let dayOfWeek = calendar.component(.weekday, from: nextWeek)
        let weekdays = calendar.range(of: .weekday, in: .weekOfYear, for: nextWeek)!

        let days = (weekdays.lowerBound ..< weekdays.upperBound).flatMap {

            calendar.date(byAdding: .day, value: $0 - dayOfWeek, to: nextWeek)

        }.filter { !calendar.isDateInWeekend($0) }

        // Week Days from monday to friday
        let formatter = DateFormatter()
        formatter.dateFormat = "yyyy-MM-dd"

        for date in days {
            print(formatter.string(from: date))
        }

在我的情况下，如果日期星期六或星期日它应该在下周显示，但它显示的是同一周。

In my case if the day is Saturday or Sunday it should display next week but it is displaying the same week.

推荐答案

你只需要得到当前星期一的星期日，将其添加到数组并映射最后一个数组元素，向其添加一天：

You just need to get the current week monday's date, add it to an array and map the last array element adding one day to it:

Swift 4.1•Xcode 9.3或更晚

extension Calendar {
    static let iso8601 = Calendar(identifier: .iso8601)
}
extension Date {
    var cureentWeekMonday: Date {
        return Calendar.iso8601.date(from: Calendar.iso8601.dateComponents([.yearForWeekOfYear, .weekOfYear], from: self))!
    }
    var currentWeekdays: [Date] {
        return (0...4).compactMap{ Calendar.iso8601.date(byAdding: DateComponents(day: $0), to: cureentWeekMonday) } // for Swift versions earlier than 4.1 use flatMap instead
    }
}

---

---

let currentWeekdays = Date().currentWeekdays
print(currentWeekdays)  // ["Jul 17, 2017, 12:00 AM", "Jul 18, 2017, 12:00 AM", "Jul 19, 2017, 12:00 AM", "Jul 20, 2017, 12:00 AM", "Jul 21, 2017, 12:00 AM"]

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