如何在 Swift 中从系统获取工作日数组？

Question

如何从系统中获取包含星期几的数组（我认为来自

NSDate

）？

到目前为止，我只能获取当天，但我希望能够获取数组中的所有工作日。

如果一周的第一天设置为星期一，我的数组将如下所示：

[ Mon, Tue, Wed... ]

如果一周的第一天是星期日，我的数组将如下所示：

[Sun, Mon, Tue... ]

代码：

let dateNow = NSDate()
let calendar = NSCalendar.currentCalendar()
let components = calendar.components(.CalendarUnitHour | .CalendarUnitMinute | .CalendarUnitSecond | .CalendarUnitYear , fromDate: dateNow) 

/*This is the way how i take system time */ 

let format = NSDateFormatter()
format.dateFormat = "EEE"
stringDay = format.stringFromDate(dateNow) 

Answer 1

尝试这些属性：

let fmt = NSDateFormatter()
fmt.weekdaySymbols // -> ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"]
fmt.shortWeekdaySymbols // -> ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"]
fmt.veryShortWeekdaySymbols // -> ["S", "M", "T", "W", "T", "F", "S"]
fmt.standaloneWeekdaySymbols // -> ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"]
fmt.shortStandaloneWeekdaySymbols // -> ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"]
fmt.veryShortStandaloneWeekdaySymbols // -> ["S", "M", "T", "W", "T", "F", "S"]

似乎它们总是返回

Sun ... Sat

数组，无论

.firstWeekday

的

.calendar

属性如何。因此，您必须手动旋转它。

let firstWeekday = 2 // -> Monday

var symbols = fmt.shortWeekdaySymbols
symbols = Array(symbols[firstWeekday-1..<symbols.count]) + symbols[0..<firstWeekday-1]
// -> ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"]

Answer 2

现在我们可以使用 Calendar.current 代替 DateFormatter:

    Calendar.current.weekdaySymbols // -> ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"]
    Calendar.current.shortWeekdaySymbols // -> ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"]
    Calendar.current.veryShortWeekdaySymbols // -> ["S", "M", "T", "W", "T", "F", "S"]
    Calendar.current.standaloneWeekdaySymbols // -> ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"]
    Calendar.current.shortStandaloneWeekdaySymbols // -> ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"]
    Calendar.current.veryShortStandaloneWeekdaySymbols // -> ["S", "M", "T", "W", "T", "F", "S"]

Answer 3

斯威夫特

创建一个

DateFormatter

：

let formatter: DateFormatter = {
    let formatter = DateFormatter()

    // 💡 You can setup the formatter here. For example, setting the locale to return the weekdays in the desired language.
    formatter.locale = .init(identifier: "fa")

    return formatter
}()

✅ 注意 创建格式化程序是一项非常昂贵的任务，您可能会在主线程中遇到滞后。如果您觉得再次需要它，请尝试缓存它

现在您可以使用：

formatter.weekdaySymbols \\ ["یکشنبه", "دوشنبه", "سه‌شنبه", "چهارشنبه", "پنجشنبه", "جمعه", "شنبه"]
formatter.veryShortWeekdaySymbols \\ ["ی", "د", "س", "چ", "پ", "ج", "ش"]

注意，您可以使用

en

标识符来获取以上所有英文内容，例如：

,,,
formatter.locale = .init(identifier: "en")
,,,

formatter.weekdaySymbols // -> ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"]
formatter.shortWeekdaySymbols // -> ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"]
formatter.veryShortWeekdaySymbols // -> ["S", "M", "T", "W", "T", "F", "S"]

Answer 4

如果您想将星期一作为第一天，您可以使用此扩展。

extension SequenceType where Generator.Element == String {
    func mondayFirst(withSunday: (Bool)) -> [String] {
        var tempWeek = self as! [String]

        let tempDay = tempWeek.first

        tempWeek.removeFirst()

        if (!withSunday) {
            tempWeek.append(tempDay!)
        }

        return tempWeek
    }
}