SWIFT 2.2 DatePicker 中的最小和最大 HOUR

Question

我正在尝试在我的日期选择器中设置最大和最小小时数。我设法设置了最小值，但无法解析最大值。这是我目前所拥有的:

    let startHour: Int = 8
    let endHour: Int = 22
    let date1: NSDate = NSDate()
    let gregorian: NSCalendar = NSCalendar(calendarIdentifier: NSCalendarIdentifierGregorian)!
    let components: NSDateComponents = gregorian.components(([.Day, .Month, .Year, .Hour, .Minute]), fromDate: date1)

    if components.hour >= 22 && components.hour < 8 {
        components.hour = startHour
        components.minute = 0
        components.second = 0
    }

    let startDate: NSDate = gregorian.dateFromComponents(components)!

    components.hour = endHour
    components.minute = 0

    let endDate: NSDate = gregorian.dateFromComponents(components)!

    picker.datePickerMode = .DateAndTime
    picker.minimumDate = startDate
    picker.maximumDate = endDate
    picker.setDate(startDate, animated: true)

有没有办法在 .maximumDate 方法(现在是我的当前日期)中忽略当前日期和月份？它将我选择的 future 日期设置回当前日期，并仅检查设置为上午 8 点至晚上 10 点的小时间隔。我希望 DatePicker 能够为 future 的每一天启用从早上 8 点到晚上 10 点的选择时间，而不仅仅是当天。

Answer 1

删除 picker.maximumDate = endDate 并编写您自己的自定义验证方法。

// Call datePickerChanged method when the picker finishes rotating
picker.addTarget(self, action: #selector(datePickerChanged(_:)), forControlEvents: .ValueChanged)

func datePickerChanged(picker: UIDatePicker) {
    let selectedDate = picker.date
    // 1) if selectedDate's hour > than your endHour (10pm)
    // 2) create yourNewDate with endHour = 10pm
    // 3) set new date with animation
    picker.setDate(yourNewDate, animated: true)
}