从日期范围创建日期字符串数组

我有Date()属性。 startingAt和endingAt 。 还有一个Date（）数组，它已经被alreadyRegistred 。 我必须创建一个字符串数组，其日期介于startingAt和endingAt之间。 包括StartingAt和endingAt ，最后一个要求是排除alreadyRegistred日期。

你有一些优雅的想法，怎么做？ 感谢帮助！

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，并且您可以访问addsTimeInterval（_ :)方法。

知道这一点，很容易在两个日期之间进行一些计算。

我不完全了解您所需的业务逻辑，但这是一个天真的实现，可以在两个Dates之间生成Dates 。 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

试试看，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 “，”08/01/2018“，”09/01/2018“，”10/01/2018“，”11/01/2018“，”12/01/2018“，”13/01/2018“， “14/01/2018”，“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 }