相关疑难解决方法(0)

我想要获得周一的本周日期.这在我的表格视图中被视为一周的第一天.我还需要获得本周的周日.在我的表视图中,这被视为一周的最后一天.

目前的尝试:

let date = NSDate()
let calendar = NSCalendar.currentCalendar()
calendar.firstWeekday = 1
//attempt to changefirstday

let dateFormatter = NSDateFormatter()
let theDateFormat = NSDateFormatterStyle.ShortStyle
let theTimeFormat = NSDateFormatterStyle.ShortStyle
dateFormatter.dateStyle = theDateFormat
dateFormatter.timeStyle = theTimeFormat

let currentDateComponents = calendar.components([.YearForWeekOfYear, .WeekOfYear ], fromDate: date)
let startOfWeek = calendar.dateFromComponents(currentDateComponents)
print("startOfWeek is \(startOfWeek)")
let stringDate = dateFormatter.stringFromDate(startOfWeek!)
print("string date is \(stringDate)") //This is returning Sunday's date

如何快速开始和结束一周？这是我的代码

extension Date {
    var startOfWeek: Date? {
        let gregorian = Calendar(identifier: .gregorian)
        guard let sunday = gregorian.date(from: gregorian.dateComponents([.yearForWeekOfYear, .weekOfYear], from: self)) else { return nil }
        return gregorian.date(byAdding: .day, value: 1, to: sunday)
    }

    var endOfWeek: Date? {
        let gregorian = Calendar(identifier: .gregorian)
        guard let sunday = gregorian.date(from: gregorian.dateComponents([.yearForWeekOfYear, .weekOfYear], from: self)) else { return nil }
        return gregorian.date(byAdding: .day, value: 7, to: sunday)
    }
}

我这样打电话

let startWeek = Date().startOfWeek
let endWeek = Date().endOfWeek
print(startWeek!)
print(endWeek!)
var dateFormat1 …

如果当前日期是2018年8月3日(星期五),我想获得2018年8月5日(星期六和星期日)

如果当前日期是8月4日(星期六),我仍然希望获得2018年8月5日(星期六和星期日)

如果当前日期是8月6日(星期一)那么我想得到8月11日和12日(星期六和星期日)

如何在swift中做到这一点？

我必须实现图形,这样我才能获得周开始日期和周末日期,如果我将传递日期对象和周数.

我怎样才能实现它我尝试过但却没有完全准确？

以下是我的代码: -

平日: -

//Day of week
func getDayOfWeek(today:String)->Int? {
    let formatter  = DateFormatter()
    formatter.dateFormat = "yyyy-MM-dd"
    if let todayDate = formatter.date(from: today) {
        let myCalendar = NSCalendar(calendarIdentifier: NSCalendar.Identifier.gregorian)!
        let myComponents = myCalendar.components(.weekday, from: todayDate)
        let weekDay = myComponents.weekday
        return weekDay
    } else {
        return nil
    }
}. 

extension Date {
  var millisecondsSince1970:Int {
      return Int((self.timeIntervalSince1970 * 1000.0).rounded())
  }

  init(milliseconds:Int) {
      self = Date(timeIntervalSince1970: TimeInterval(milliseconds / 1000))
  }

  func startOfWeek(weekday: Int?) -> Date {
      var cal = Calendar.current …

我想检查用户一周的第一天是星期一还是星期日，以便使用日历执行某些操作。是否可以确定使用NSCalendar或任何其他方式？