ios - 从 Swift 中的当前日期获取下周二和周四

Question

我需要显示从当前日期开始的下周二和下周四的日期。如果当前日期是星期三，那么我需要下个星期四，然后是下个星期的下个星期二。

我已经用下面的解决方案兜了一圈，但我无法操纵这些解决方案来给我需要的结果。有什么想法吗？

var monday: Date {
return Calendar(identifier: .iso8601).date(from: Calendar(identifier: .iso8601).dateComponents([.yearForWeekOfYear, .weekOfYear], from: Date()))!
}
// Monday, November 6, 2017 at 12:00:00 AM

和

let f = DateFormatter()
f.weekdaySymbols[Calendar.current.component(.weekday, from: Date())]
// Saturday

Answer 1

获取当前工作日。如果是星期二或星期三，将接下来两次出现的顺序设置为 Thu, Tue (5, 3) 否则 (3, 5):

var currentDate = Date()
let calendar = Calendar.current
let currentWeekday = calendar.component(.weekday, from: currentDate)
let nextWeekdays = 3...4 ~= currentWeekday ? [5, 3] : [3, 5]

然后使用 nextDate(after: matching: matchingPolicy)

将工作日映射到下一个事件

let result = nextWeekdays.map { weekday -> Date in
    let components = DateComponents(weekday: weekday)
    let nextOccurrence = calendar.nextDate(after: currentDate, matching: components, matchingPolicy: .nextTime)!
    currentDate = nextOccurrence
    return nextOccurrence
}
print(result)