ios:提前 3 周(按日期)

Question

我需要比当前日期提前 3 周的日期。并将所有日期添加到数组中。我怎样才能得到这个？

 let date = NSDate()
        let calendar = NSCalendar(calendarIdentifier: NSCalendarIdentifierGregorian)
        let comps = calendar?.components([.Day, .WeekOfMonth, .Month], fromDate: date)
        let days = calendar?.rangeOfUnit(NSCalendarUnit.Day, inUnit: NSCalendarUnit.Month, forDate: date)
        print(days?.length)

这段代码给出了当月的天数。但下个月可能会出现 3 个弱点

for example today is 16.02 I need print something like this

16 17 18 19 20 21 22 23 24 25 26 27 28 29 01 02 04....

感谢提前

Answer 1

这个怎么样，它根据要求生成一个日期数组

    var date = NSDate()
    var days : [String] = []

    let dateFormatter = NSDateFormatter()
    dateFormatter.dateFormat = "dd"

    for _ in 0...20
    {
        days.append(dateFormatter.stringFromDate(date))

        // move on to the next day
        date = NSCalendar.currentCalendar().dateByAddingUnit(
            .Day,
            value: 1,
            toDate: date,
            options: NSCalendarOptions(rawValue: 0))!
    }
    print(days)