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如何在日历中使用NSCalendar range函数?

nscalendar swift

2

Laurence Wingo · 技术社区 · 6 年前

extension Calendar {
    /**
     Returns a tuple containing the start and end dates for the week that the
     specified date falls in.
     */
    func weekDatesForDate(date: NSDate) -> (start: NSDate, end: NSDate) {
        var interval: TimeInterval = 0
        var start: NSDate?
        range(of: .weekOfYear, start: &start, interval: &interval, for: date as Date)
        let end = start!.addingTimeInterval(interval)

        return (start!, end)
    }
}

extension NSCalendar {
    /**
     Returns a tuple containing the start and end dates for the week that the
     specified date falls in.
     */
    func weekDatesForDate(date: NSDate) -> (start: NSDate, end: NSDate) {
        var interval: TimeInterval = 0
        var start: NSDate?
        range(of: .weekOfYear, start: &start, interval: &interval, for: date as Date)
        let end = start!.addingTimeInterval(interval)

        return (start!, end)
    }
}

1 回复 | 直到 6 年前

1

2

vadian 6 年前

相当于 range(of:start:interval:for:) 在里面 Calendar dateInterval(of:start:interval:for:)

不要使用 NSDate 迅速

extension Calendar {
    /**
     Returns a tuple containing the start and end dates for the week that the
     specified date falls in.
     */
    func weekDatesForDate(date: Date) -> (start: Date, end: Date) {
        var interval: TimeInterval = 0
        var start = Date()
        dateInterval(of: .weekOfYear, start: &start, interval: &interval, for: date)
        let end = start.addingTimeInterval(interval)

        return (start, end)
    }
}

DateInterval 作为返回值而不是元组:

extension Calendar {
    /**
     Returns a tuple containing the start and end dates for the week that the
     specified date falls in.
     */
    func weekDatesForDate(date: Date) -> DateInterval {
        var interval: TimeInterval = 0
        var start = Date()
        dateInterval(of: .weekOfYear, start: &start, interval: &interval, for: date)
        let end = start.addingTimeInterval(interval)
        return DateInterval(start: start, end: end)
    }
}