如何快速获得两个日期之间的 30 分钟时间段数组

Question

例如：

startDate:- 20-08-2018 10:00 AM

endDate:- 20-08-2018 02:30 PM

输出：[“10:00 AM”、“10:30 AM”、“11:00 AM”、“11:30 AM”、“12:00PM”、“12:30 PM”、“01:00 PM” , "01:30 PM", "02:00 PM", "02:30 PM"]

var fromTime:Date = getFromTime
fromTime = fromTime.addingTimeInterval(-1800)

guard let toTime:Date  = timeFormat.date(from:endTime) else {
    return nil
}

var dateByAddingThirtyMinute : Date!
let timeinterval : TimeInterval = toTime.timeIntervalSince(fromTime)
let numberOfIntervals : Double = timeinterval / 3600;

var timeArrayAM = [String]()
var timeArrayPM = [String]()

for _ in stride(from: 0, to: Int(numberOfIntervals * 2), by: 1) {

    dateByAddingThirtyMinute = fromTime.addingTimeInterval(1800)
    fromTime = dateByAddingThirtyMinute

    if let dateString = dateByAddingThirtyMinute.format(with: "hh:mm a") as? String {

        // print("Time after 30 min = \(dateString)")

        if temp == 0 {

            let time = dateString
            guard let getStopTime = timeFormat.date(from: time) else {

                return nil
            }

            var stopTime = getStopTime

            var date = Date()
            date = date.addingTimeInterval(TimeInterval(advanceTimeInterval*60))
            let calendar = Calendar.current

            let year = calendar.component(.year, from: date)
            let month = calendar.component(.month, from: date)
            let day = calendar.component(.day, from: date)
            let hour = calendar.component(.hour, from: stopTime)
            let minute = calendar.component(.minute, from: stopTime)

            stopTime = calendar.date(bySetting: .year, value: year, of: stopTime)!
            stopTime = calendar.date(bySetting: .month, value: month, of: stopTime)!
            stopTime = calendar.date(bySetting: .day, value: day, of: stopTime)!
            stopTime = calendar.date(bySetting: .hour, value: hour, of: stopTime)!
            stopTime = calendar.date(bySetting: .minute, value: minute, of: stopTime)!

            let timeDifference = calendar.dateComponents([.hour, .minute], from: stopTime, to: date)

            // print_debug("************************************")
            // print(timeDifference.hour, timeDifference.minute)
            if timeDifference.hour! < 0 || timeDifference.minute! < 0 || (timeDifference.hour! == 0 && timeDifference.minute! == 0 ) {
                showFirstTime = dateString
                temp = 1
            }
            // print_debug("************************************")
        }

Answer 1

你可以这样做，

var array: [String] = []

let formatter = DateFormatter()
formatter.dateFormat = "dd-MM-yyyy hh:mm a"

let formatter2 = DateFormatter()
formatter2.dateFormat = "hh:mm a"

let startDate = "20-08-2018 10:00 AM"
let endDate = "20-08-2018 02:30 PM"

let date1 = formatter.date(from: startDate)
let date2 = formatter.date(from: endDate)

var i = 1
while true {
    let date = date1?.addingTimeInterval(TimeInterval(i*30*60))
    let string = formatter2.string(from: date!)

    if date! >= date2! {
        break;
    }

    i += 1
    array.append(string)
}
print(array)

上面的输出是，

["10:30 AM", "11:00 AM", "11:30 AM", "12:00 PM", "12:30 PM", "01:00 PM", "01:30 PM", "02:00 PM", "02:30 PM"]