计算时隙时得到 nil 值 swift

Question

我正在遵循 post 中的解决方案，但在我的以下函数中 date2 得到了一个 nil 值：

func calculateOpenTimeSlots() {

        let formatter = DateFormatter()
        formatter.dateFormat = "hh:mm"
        let weekday = self.actualWeekday
        let openingTime = openingTimeArray[weekday!].openingTime
        let closingTime = openingTimeArray[weekday!].closingTime
        let date1 = formatter.date(from: openingTime)
        let date2 = formatter.date(from: closingTime)
        var i = 1
        timeSlotArray.removeAll()
        while true {
            let date = date1?.addingTimeInterval(TimeInterval(i*30*60))
            let string = formatter.string(from: date!)
            if date! >= date2! {break}
            i = i + 1
            timeSlotArray.append(string)
        }

    }

数组是：

var openingTimeArray: [(weekday: Int, openingTime: String, closingTime: String)] = [(weekday: 0, openingTime: "10:00", closingTime: "19:00"), (weekday: 1, openingTime: "10:00", closingTime: "19:00"), (weekday: 2, openingTime: "10:00", closingTime: "19:00"), (weekday: 3, openingTime: "10:00", closingTime: "19:00"), (weekday: 4, openingTime: "10:00", closingTime: "19:00"), (weekday: 5, openingTime: "10:00", closingTime: "19:00"), (weekday: 6, openingTime: "10:00", closingTime: "19:00"), (weekday: 7, openingTime: "10:00", closingTime: "19:00")]

openingTime 和 closingTime 值不是零，它们是正确的值，但是在 date1 我得到一个完整的日期，其中小时早 1 小时。 date1 是 2000-01-01 09:00:00 UTC 但我预计它是 10:00.

我仍然不掌握日期格式化程序，我不明白为什么我得到一个零 date2 和一个错误的 date1。任何为我指出正确方向的解释都会像往常一样非常有帮助。非常感谢

Answer 1

我发现问题出在格式声明中 formatter.dateFormat = "hh:mm"。我将其更改为 formatter.dateFormat = "HH:mm"，现在可以按预期工作了。我不得不在 while 循环之前添加一个追加 timeSlotArray.append(openingTime) 因为循环没有追加从开放时间开始的第一个时间段，但我想重写循环以考虑到这一点。关于如何实现这一目标的任何建议？

func calculateOpenTimeSlots() {
         timeSlotArray.removeAll()

        let formatter = DateFormatter()
//        formatter.timeZone = TimeZone(identifier: "UTC")
        formatter.dateFormat = "HH:mm"
        let weekday = self.actualWeekday
        let openingTime = openingTimeArray[weekday!].openingTime
        let closingTime = openingTimeArray[weekday!].closingTime
        let date1 = formatter.date(from: openingTime)
        timeSlotArray.append(openingTime)
        let date2 = formatter.date(from: closingTime)
        var i = 1

        while true {
            let date = date1?.addingTimeInterval(TimeInterval(i*30*60))
            let string = formatter.string(from: date!)
            if date! >= date2! {break}
            i = i + 1
            timeSlotArray.append(string)
        }
        print(timeSlotArray)

    }

计算时隙时得到 nil 值 swift

getting a nil value while calculating time slots swift

ios

swift

dateformatter