如何在Swift中获取两个日期之间的天数？ [英] How to get an array of days between two dates in Swift?

问题描述

请考虑我们具有以下函数签名：

Consider that we have a function signature as:

func datesRange(from: Date, to: Date) -> [Date]

应从开始使用和至日期实例，并返回一个数组，其中包含其参数之间的日期（天）。

which should take from date and to date instances and returns an array containing the dates (days) between its parameters. How to achieve it?

推荐答案

您可以这样实现：

func datesRange(from: Date, to: Date) -> [Date] {
    // in case of the "from" date is more than "to" date,
    // it should returns an empty array:
    if from > to { return [Date]() }

    var tempDate = from
    var array = [tempDate]

    while tempDate < to {
        tempDate = Calendar.current.date(byAdding: .day, value: 1, to: tempDate)!
        array.append(tempDate)
    }

    return array
}

用法：

let today = Date()
let nextFiveDays = Calendar.current.date(byAdding: .day, value: 5, to: today)!

let myRange = datesRange(from: today, to: nextFiveDays)
print(myRange)
/*
[2018-03-20 14:46:03 +0000,
 2018-03-21 14:46:03 +0000,
 2018-03-22 14:46:03 +0000,
 2018-03-23 14:46:03 +0000,
 2018-03-24 14:46:03 +0000,
 2018-03-25 14:46:03 +0000]
*/

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