如何快速获得本周的本周日期

概述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 changefirstdaylet date 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 changefirstdaylet dateFormatter = NSDateFormatter()let theDateFormat = NSDateFormatterStyle.ShortStylelet theTimeFormat = NSDateFormatterStyle.ShortStyledateFormatter.dateStyle = theDateFormatdateFormatter.timeStyle = theTimeFormatlet 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

解决方法 我写了日期扩展以获取特定工作日的日期,这里使用Swift 4是多么容易,

Date.today().next(.monday)                    // Feb 12,2018 at 12:00 AMDate.today().next(.sunday)                    //  Feb 11,2018 at 12:00 AMDate.today().prevIoUs(.sunday)                // Feb 4,2018 at 12:00 AMDate.today().prevIoUs(.monday)                // Feb 5,2018 at 12:00 AMDate.today().prevIoUs(.thursday)              // Feb 1,2018 at 12:00 AMDate.today().next(.thursday)                  // Feb 15,2018 at 12:00 AMDate.today().prevIoUs(.thursday,consIDerToday: true)    // Feb 8,2018 at 11:04 PMDate.today().next(.monday)            .next(.sunday)            .next(.thursday)                  // Feb 22,2018 at 12:00 AM

这是Date扩展名,

extension Date {  static func today() -> Date {      return Date()  }  func next(_ weekday: Weekday,consIDerToday: Bool = false) -> Date {    return get(.Next,weekday,consIDerToday: consIDerToday)  }  func prevIoUs(_ weekday: Weekday,consIDerToday: Bool = false) -> Date {    return get(.PrevIoUs,consIDerToday: consIDerToday)  }  func get(_ direction: SearchDirection,_ weekDay: Weekday,consIDerToday consIDer: Bool = false) -> Date {    let dayname = weekDay.rawValue    let weekdaysname = getWeekDaysInEnglish().map { .lowercased() }    assert(weekdaysname.contains(dayname),"weekday symbol should be in form \(weekdaysname)")    let searchWeekdayIndex = weekdaysname.index(of: dayname)! + 1    let calendar = Calendar(IDentifIEr: .gregorian)    if consIDer && calendar.component(.weekday,from: self) == searchWeekdayIndex {      return self    }    var nextDateComponent = DateComponents()    nextDateComponent.weekday = searchWeekdayIndex    let date = calendar.nextDate(after: self,matching: nextDateComponent,matchingPolicy: .nextTime,direction: direction.calendarSearchDirection)    return date!  }}// MARK: Helper methodsextension Date {  func getWeekDaysInEnglish() -> [String] {    var calendar = Calendar(IDentifIEr: .gregorian)    calendar.locale = Locale(IDentifIEr: "en_US_POSIX")    return calendar.weekdaySymbols  }  enum Weekday: String {    case monday,tuesday,wednesday,thursday,frIDay,saturday,sunday  }  enum SearchDirection {    case Next    case PrevIoUs    var calendarSearchDirection: Calendar.SearchDirection {      switch self {      case .Next:        return .forward      case .PrevIoUs:        return .backward      }    }  }}

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