[英]Get all dates for current week returns incorrect if the date is beginning of a month
这是我在网上找到的代码,用于根据今天的日期获取当前一周的所有日期。 如果日期是月份的开始,例如2016年9月1日星期四,那么它将从星期四开始一周,到2016年9月7日星期三结束一周。 这真的让我感到困扰,因为如果日期是月底; 2016年7月31日(星期日),然后它将在星期一开始,在该周的星期日结束,这正是我想要的。
这可能是重复的,但我花了一段时间看类似的问题,但我仍然陷于困境。
编辑:有没有一种方法可以根据当前日期返回当前一周的所有日期?(如果您有时间,还可以在下一周吗?)
func formatDate(date: NSDate) -> String {
let format = "EEEE MMMM dd yyyy"
let formatter = NSDateFormatter()
formatter.dateFormat = format
return formatter.stringFromDate(date)
}
// =======================================================================//
// THIS WEEK DATES //
// =======================================================================//
func formattedDaysInThisWeek() -> [String] {
// create calendar
let calendar = NSCalendar(identifier: NSCalendarIdentifierGregorian)!
// today's date
let today = NSDate()
let todayComponent = calendar.components([.Day, .Month, .Year], fromDate: today)
let components = calendar.components([.Weekday], fromDate: today)
// range of dates in this week
let thisWeekDateRange = calendar.rangeOfUnit(.Day, inUnit:.WeekOfMonth, forDate:today)
// date interval from today to beginning of week
let dayInterval = thisWeekDateRange.location - todayComponent.day
print(thisWeekDateRange.location)
print(todayComponent.day)
// date for beginning day of this week, ie. this week's Sunday's date
if components.weekday == 1 {
print("Is a sunday")
let beginningOfWeek = calendar.dateByAddingUnit(.Day, value: -6, toDate: today, options: .MatchNextTime)
var formattedDays: [String] = []
for i in 0 ..< 7 {
let date = calendar.dateByAddingUnit(.Day, value: i, toDate: beginningOfWeek!, options: .MatchNextTime)!
formattedDays.append(formatDate(date))
}
return formattedDays
} else {
print("Not a sunday")
let beginningOfWeek = calendar.dateByAddingUnit(.Day, value: dayInterval, toDate: today, options: .MatchNextTime)
var formattedDays: [String] = []
for i in 1 ..< thisWeekDateRange.length + 1 {
let date = calendar.dateByAddingUnit(.Day, value: i, toDate: beginningOfWeek!, options: .MatchNextTime)!
formattedDays.append(formatDate(date))
}
return formattedDays
}
}
该解决方案检查当前日期是否为星期一。
如果是 ,这是一周的开始,如果不是 ,请回到上周一。
它还使用formatDate
函数。
func formattedDaysInThisWeek() -> [String] {
// create calendar
let calendar = Calendar(identifier: .gregorian)
// today's date
let today = Date()
let weekday = calendar.component(.weekday, from: today)
let beginningOfWeek : Date
if weekday != 2 { // if today is not Monday, get back
let weekDateConponent = DateComponents(weekday: 2)
beginningOfWeek = calendar.nextDate(after: today, matching: weekDateConponent, matchingPolicy: .nextTime, direction: .backward)!
} else { // today is Monday
beginningOfWeek = calendar.startOfDay(for: today)
}
var formattedDays = [String]()
for i in 0..<7 {
let date = calendar.date(byAdding: .day, value: i, to: beginningOfWeek)!
formattedDays.append(formatDate(date))
}
return formattedDays
}
我不知道这里是否有实际的问题,但是我写了一个简短的代码段,它将始终为您提供当前一周的星期日:
let today = NSDate()
let calendar = NSCalendar(identifier: NSCalendarIdentifierGregorian)!
let todayComps = calendar.components([.Day, .Month, .Year], fromDate: today)
let dayOfWeekComps = calendar.components([.Weekday], fromDate: today)
todayComps.day -= (dayOfWeekComps.weekday - 1)
let sunday = calendar.dateFromComponents(todayComps)
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