从日期范围

Question

我有Date()个属性。 startingAt和endingAt。还有一个Date（）数组，它是alreadyRegistred。我必须创建一个日期在startingAt和endingAt之间的字符串数组。包含StartingAt和endingAt，最后一项要求是排除alreadyRegistred个日期。

你有一些优雅的想法，怎么做？谢谢你的帮助！

编辑：最终数组中的最大日期数约为7天。

Answer 1

不要忘记Date基本上只是一个时间戳，您可以访问addingTimeInterval(_:)方法。

知道这一点，很容易在两个日期之间进行一些计算。

我并不完全了解您所需的业务逻辑，但这是一个在两个日期之间生成Dates的天真实现。我相信你可以在操场上跑步并探索一下。

import UIKit

func intervalDates(from startingDate:Date, to endDate:Date, with interval:TimeInterval) -> [Date] {
    guard interval > 0 else { return [] }

    var dates:[Date] = []
    var currentDate = startingDate

    while currentDate <= endDate {
        currentDate = currentDate.addingTimeInterval(interval)
        dates.append(currentDate)
    }

    return dates
}


let startingDate = Date() // now
let endDate = Date(timeIntervalSinceNow: 3600 * 24 * 7) // one week from now
let intervalBetweenDates:TimeInterval = 3600 * 3// three hours

let dates:[Date] = intervalDates(from: startingDate, to: endDate, with: intervalBetweenDates)



let dateFormatter = DateFormatter()
dateFormatter.dateStyle = .long
dateFormatter.timeStyle = .long

let dateStrings = dates.map{dateFormatter.string(from: $0)}

print("NOW : \(startingDate)")
for (index, string) in dateStrings.enumerated() {
    print("\(index) : \(string)")
}
print("END DATE : \(endDate)")

Answer 2

试试这个，看看：

// Start & End date string
let startingAt = "01/01/2018"
let endingAt = "08/03/2018"

// Sample date formatter
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "dd/MM/yyyy"

// start and end date object from string dates
var startDate = dateFormatter.date(from: startingAt) ?? Date()
let endDate = dateFormatter.date(from: endingAt) ?? Date()

// String date array, to be excluded
let alreadyRegistred = ["01/01/2018", "15/01/2018", "10/02/2018", "20/02/2018", "05/03/2018"]

// Actual operational logic
var dateRange: [String] = []
while startDate <= endDate {
    let stringDate = dateFormatter.string(from: startDate)

    startDate = Calendar.current.date(byAdding: .day, value: 1, to: startDate) ?? Date()
    if (alreadyRegistred.contains(stringDate)) {
        continue
    } else {
        dateRange.append(stringDate)
    }

}

print("Resulting Array - \(dateRange)")

结果如下：

  

结果数组 - [“02/01/2018”，“03/01/2018”，“04/01/2018”，“05/01/2018”，“06/01/2018”，“07 / 01/2018“，”08/01/201“，”09/01/2018“，”10/01/2018“，”11/01/2018“，”12/01/2018“，”13/01 / 2018年“，”2014年1月14日“，”16/01/2018“，”17/01/2018“，”18/01/2018“，”19/01/2018“，”20/01/2018“ ，“21/01/2018”，“22/01/2018”，“23/01/2018”，“24/01/2018”，“25/01/2018”，“26/01/2018”，“ 27/01/2018“，”28/01/2018“，”29/01/2018“，”30/01/2018“，”31/01/2018“，”01/02/2018“，”02 / 02/2018“，”03/02/2018“，”04/02/2018“，”05/02/2018“，”06/02/2018“，”07/02/2018“，”08/02 / 2018“，”09/02/2018“，”11/02/2018“，”12/02/2018“，”13/02/2018“，”14/02/2018“，”15/02/2018“ ，“16/02/2018”，“17/02/2018”，“18/02/2018”，“19/02/2018”，“21/02/2018”，“22/02/2018”，“ 23/02/2018“，”24/02/2018“，”25/02/2018“，”26/02/2018“，”27/02/2018“，”28/02/2018“，”01 / 03/2018“，”02/03/2018“，”03/03/2018“，”04/03/2018“，”06/03/2018“，”07/03/2018“，”08/03 / 2018" ]

Answer 3

let startDate = Date()
let endDate = Date().addingTimeInterval(24*60*60*10) // i did this to get the end date for now
var stringdateArray = [String]()

if let days = getNumberofDays(date1: startDate, date2: endDate) {

    for i in 0...days-1 {
        let date = startDate.addingTimeInterval(Double(i)*24*3600)
        let stringDate =  getStringDate(fromDate: date, havingFormat: "yyyy-MM-dd")
        if !(alreadyRegisteredArray.contains(stringDate)) { // checking if already registered
          stringdateArray.append(stringDate)
       }

    }
}

和我们的助手方法

let dateFormatter = DateFormatter()


func getStringDate(fromDate: Date,havingFormat: String) -> String {

    dateFormatter.dateFormat = havingFormat
    dateFormatter.amSymbol = "AM"
    dateFormatter.pmSymbol = "PM"
    let date =  dateFormatter.string(from: fromDate)
    return  date
}

func getNumberofDays(date1: Date, date2: Date) -> Int? {
    let calendar = NSCalendar.current

    let date1 = calendar.startOfDay(for: date1)
    let date2 = calendar.startOfDay(for: date2)

    let components = calendar.dateComponents([.day], from: date1, to: date2)
    return components.day
}