在没有 WeekCalendarUnit 的情况下获取一周的第一天
Get the first day of week without WeekCalendarUnit
我想根据 NSDate 获取一周的第一天。
它工作正常,但我有一个警告,因为 WeekCalendarUnit 已被弃用。
我做了一些研究,并尝试将 WeekCalendarUnit 替换为:
static var CalendarUnitWeekday: NSCalendarUnit { get }
static var CalendarUnitWeekdayOrdinal: NSCalendarUnit { get }
static var CalendarUnitWeekOfMonth: NSCalendarUnit { get }
static var CalendarUnitWeekOfYear: NSCalendarUnit { get }
但我没有得到相同的结果。这是我的代码垃圾:
var date = NSDate()
dateFormatter.dateFormat = "dd/YY"
let calendar = NSCalendar.currentCalendar()
let currentDateComponents = calendar.components(.CalendarUnitYear | .WeekCalendarUnit , fromDate: date)
let startOfWeek = calendar.dateFromComponents(currentDateComponents)
var dteString = dateFormatter.stringFromDate(startOfWeek!)
// Output is "17/15"
有什么想法吗?
您可以结合使用 .CalendarUnitWeekOfYear
.CalendarUnitYearForWeekOfYear
,这应该给出预期的结果:
let currentDateComponents = calendar.components(.CalendarUnitYearForWeekOfYear | .CalendarUnitWeekOfYear , fromDate: date)
let startOfWeek = calendar.dateFromComponents(currentDateComponents)
或者,使用 rangeOfUnit()
(我个人觉得更容易
使用):
var startOfWeek : NSDate?
calendar.rangeOfUnit(.CalendarUnitWeekOfYear, startDate: &startOfWeek, interval: nil, forDate: date)
在Swift 2中这个必须改成
let currentDateComponents = calendar.components([.YearForWeekOfYear, .WeekOfYear ], fromDate: date)
let startOfWeek = calendar.dateFromComponents(currentDateComponents)
和
var startOfWeek : NSDate?
calendar.rangeOfUnit(.WeekOfYear, startDate: &startOfWeek, interval: nil, forDate: date)
我想根据 NSDate 获取一周的第一天。
它工作正常,但我有一个警告,因为 WeekCalendarUnit 已被弃用。
我做了一些研究,并尝试将 WeekCalendarUnit 替换为:
static var CalendarUnitWeekday: NSCalendarUnit { get }
static var CalendarUnitWeekdayOrdinal: NSCalendarUnit { get }
static var CalendarUnitWeekOfMonth: NSCalendarUnit { get }
static var CalendarUnitWeekOfYear: NSCalendarUnit { get }
但我没有得到相同的结果。这是我的代码垃圾:
var date = NSDate()
dateFormatter.dateFormat = "dd/YY"
let calendar = NSCalendar.currentCalendar()
let currentDateComponents = calendar.components(.CalendarUnitYear | .WeekCalendarUnit , fromDate: date)
let startOfWeek = calendar.dateFromComponents(currentDateComponents)
var dteString = dateFormatter.stringFromDate(startOfWeek!)
// Output is "17/15"
有什么想法吗?
您可以结合使用 .CalendarUnitWeekOfYear
.CalendarUnitYearForWeekOfYear
,这应该给出预期的结果:
let currentDateComponents = calendar.components(.CalendarUnitYearForWeekOfYear | .CalendarUnitWeekOfYear , fromDate: date)
let startOfWeek = calendar.dateFromComponents(currentDateComponents)
或者,使用 rangeOfUnit()
(我个人觉得更容易
使用):
var startOfWeek : NSDate?
calendar.rangeOfUnit(.CalendarUnitWeekOfYear, startDate: &startOfWeek, interval: nil, forDate: date)
在Swift 2中这个必须改成
let currentDateComponents = calendar.components([.YearForWeekOfYear, .WeekOfYear ], fromDate: date)
let startOfWeek = calendar.dateFromComponents(currentDateComponents)
和
var startOfWeek : NSDate?
calendar.rangeOfUnit(.WeekOfYear, startDate: &startOfWeek, interval: nil, forDate: date)