Swift - 前一周的开始日和结束日 [英] Swift - Start day and end day of the week before previous week

问题描述

今天是 3 月 6 日星期五.如何找到 2 月 16 日是开始日，2 月 22 日是前一周的结束日.16 是我的国家保加利亚在美国将是 15 和 21 我使用 .currentCalendar()

Today is Friday 6 March. How to find that 16 Feb is the start day and 22 Feb is the end day of the week before previous week. 16 is for my country Bulgaria in USA will be 15 and 21 I use .currentCalendar()

推荐答案

这样的东西应该可以工作:

Something like this should work:

let cal = NSCalendar.currentCalendar()

let components = NSDateComponents()
components.weekOfYear -= 1

if let date = cal.dateByAddingComponents(components, toDate: NSDate(), options: NSCalendarOptions(0)) {
    var beginningOfWeek: NSDate?
    var weekDuration = NSTimeInterval()
    if cal.rangeOfUnit(.CalendarUnitWeekOfYear, startDate: &beginningOfWeek, interval: &weekDuration, forDate: date) {
        let endOfWeek = beginningOfWeek?.dateByAddingTimeInterval(weekDuration)
        print(beginningOfWeek) // Optional(2015-02-15 05:00:00 +0000)
        print(endOfWeek) // Optional(2015-02-22 05:00:00 +0000)
    }
}

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