如何将日期范围格式化为"MMM，d"? [英] How can I format Date range to "MMM, d"?

问题描述

我正在尝试显示当前日期的星期数以及星期数的日期范围.现在，日期范围格式为DateTime，我想改为将其更改为"Jan 13".关于如何解决此问题的任何建议?

I am trying to display the week number of current date, and the date range of the week number. Right now the date range format is DateTime, I would like to change it to "Jan 13"instead. Any recommendations on how I can fix this?

override func viewDidLoad() {
    super.viewDidLoad()


    let dateToday = Date()
    let weekNumber = NSCalendar.current.component(.weekOfYear, from: dateToday)
    let weekRange = dayRangeOf(weekOfYear: weekNumber, for: dateToday)

    weekLabel.text = String("Week #\(weekNumber): \(weekRange)")
}

func dayRangeOf(weekOfYear: Int, for date: Date) -> Range<Date>
{
    let calendar = Calendar.current
    let year = calendar.component(.yearForWeekOfYear, from: date)
    let startComponents = DateComponents(weekOfYear: weekOfYear, yearForWeekOfYear: year)
    let startDate = calendar.date(from: startComponents)!
    let endComponents = DateComponents(day:7, second: -1)
    let endDate = calendar.date(byAdding: endComponents, to: startDate)!
    return startDate..<endDate
}

推荐答案

有专用的API显示日期间隔: DateIntervalFormatter

There is a dedicated API to display date intervals: DateIntervalFormatter

let intervalForatter = DateIntervalFormatter()
intervalFormatter.timeStyle = .none
intervalFormatter.dateStyle = .medium
weekLabel.text = String("Week #\(weekNumber): \(intervalFormatter.string(from: weekRange.lowerBound, to: weekRange.upperBound))")

您还可以使用自定义日期格式(例如1月13日是 MMM d )

You can also use a custom date format (by the way Jan 13 is MMM d)

let intervalFormatter = DateIntervalFormatter()
intervalFormatter.dateTemplate = "MMM d"
let text = String("Week #\(weekNumber): \(intervalFormatter.string(from: weekRange.lowerBound, to: weekRange.upperBound))")

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