Question

这是我在网上找到的代码，用于根据今天的日期获取当前周的所有日期。如果日期是月初，例如 2016年9月1日星期四，则从星期四开始一周，并在 2016年9月7日星期三结束一周< / strong>即可。这真让我烦心，因为如果日期是月末; 2016年7月31日星期日然后它会在星期一开始，并在那周的星期日结束，这正是我想要的。

这可能是重复但我花了一段时间看着类似的问题，我仍然卡住了。

修改有没有办法根据当前日期返回当前周的所有日期？（如果你有时间，下周还有？）

func formatDate(date: NSDate) -> String { let format = "EEEE MMMM dd yyyy" let formatter = NSDateFormatter() formatter.dateFormat = format return formatter.stringFromDate(date) } // =======================================================================// // THIS WEEK DATES // // =======================================================================// func formattedDaysInThisWeek() -> [String] { // create calendar let calendar = NSCalendar(identifier: NSCalendarIdentifierGregorian)! // today's date let today = NSDate() let todayComponent = calendar.components([.Day, .Month, .Year], fromDate: today) let components = calendar.components([.Weekday], fromDate: today) // range of dates in this week let thisWeekDateRange = calendar.rangeOfUnit(.Day, inUnit:.WeekOfMonth, forDate:today) // date interval from today to beginning of week let dayInterval = thisWeekDateRange.location - todayComponent.day print(thisWeekDateRange.location) print(todayComponent.day) // date for beginning day of this week, ie. this week's Sunday's date if components.weekday == 1 { print("Is a sunday") let beginningOfWeek = calendar.dateByAddingUnit(.Day, value: -6, toDate: today, options: .MatchNextTime) var formattedDays: [String] = [] for i in 0 ..< 7 { let date = calendar.dateByAddingUnit(.Day, value: i, toDate: beginningOfWeek!, options: .MatchNextTime)! formattedDays.append(formatDate(date)) } return formattedDays } else { print("Not a sunday") let beginningOfWeek = calendar.dateByAddingUnit(.Day, value: dayInterval, toDate: today, options: .MatchNextTime) var formattedDays: [String] = [] for i in 1 ..< thisWeekDateRange.length + 1 { let date = calendar.dateByAddingUnit(.Day, value: i, toDate: beginningOfWeek!, options: .MatchNextTime)! formattedDays.append(formatDate(date)) } return formattedDays } }

Answer 1

此解决方案检查当前日期是否为星期一。

如果是，那就是本周的开始，如果否，请回到过去的星期一。

它还使用formatDate函数。

func formattedDaysInThisWeek() -> [String] {
    // create calendar
    let calendar = Calendar(identifier: .gregorian)

    // today's date
    let today = Date()

    let weekday = calendar.component(.weekday, from: today)
    let beginningOfWeek : Date
    if weekday != 2 { // if today is not Monday, get back
        let weekDateConponent = DateComponents(weekday: 2)
        beginningOfWeek = calendar.nextDate(after: today, matching: weekDateConponent, matchingPolicy: .nextTime, direction: .backward)!

    } else { // today is Monday
        beginningOfWeek = calendar.startOfDay(for: today)
    }
    var formattedDays = [String]()
    for i in 0..<7 {
        let date = calendar.date(byAdding: .day, value: i, to: beginningOfWeek)!
        formattedDays.append(formatDate(date))
    }
    return formattedDays
}

Answer 2

我不知道这里是否有实际的问题，但我写了一个快速片段，总是会给你本周的星期日：

let today = NSDate()
let calendar = NSCalendar(identifier: NSCalendarIdentifierGregorian)!
let todayComps = calendar.components([.Day, .Month, .Year], fromDate: today)
let dayOfWeekComps = calendar.components([.Weekday], fromDate: today)
todayComps.day -= (dayOfWeekComps.weekday - 1)
let sunday = calendar.dateFromComponents(todayComps)

如果日期是一个月的开始，则获取当前周的所有日期返回错误

2 个答案: