Question

我正在尝试显示当前日期的星期数和星期数的日期范围。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？

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
}

Answer 1

有专用的API显示日期间隔：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日为MMM d）

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

Answer 2

您可以从以下用户回答： Date Format in Swift

let dateFormatterGet = DateFormatter()
dateFormatterGet.dateFormat = "yyyy-MM-dd HH:mm:ss"

let dateFormatterPrint = DateFormatter()
dateFormatterPrint.dateFormat = "MM d"

if let date = dateFormatterGet.date(from: "2016-02-29 12:24:26") {
    print(dateFormatterPrint.string(from: date))
} else {
   print("There was an error decoding the string")
}

如何将日期范围格式化为“ MMM，d”？

2 个答案: