UIDatePicker，根据今天的日期设置最大和最小日期

Question

如果我有一个UIDatePicker，并且我希望将最小和最大日期范围设置为三十年前到三十年之间，我该如何设置它？

Answer 1

未经测试，但你可能想要这样的东西。

NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDate *currentDate = [NSDate date];
NSDateComponents *comps = [[NSDateComponents alloc] init];
[comps setYear:30];
NSDate *maxDate = [calendar dateByAddingComponents:comps toDate:currentDate options:0];
[comps setYear:-30];
NSDate *minDate = [calendar dateByAddingComponents:comps toDate:currentDate options:0];

[datePicker setMaximumDate:maxDate];
[datePicker setMinimumDate:minDate];

Swift 4.1的更新

let calendar = Calendar(identifier: .gregorian)
var comps = DateComponents()
comps.year = 30
let maxDate = calendar.date(byAdding: comps, to: Date())
comps.year = -30
let minDate = calendar.date(byAdding: comps, to: Date())
datePicker.maximumDate = maxDate
datePicker.minimumDate = minDate

Answer 2

m_datePicker.maximumDate = [NSDate date];

您可以使用此行代码设置最大日期（今天）。

Answer 3

我的快速4版@toddg是：

let currentDate = Date()
var dateComponents = DateComponents()
let calendar = Calendar.init(identifier: .gregorian)
dateComponents.year = -100
let minDate = calendar.date(byAdding: dateComponents, to: currentDate)
dateComponents.year = -13
let maxDate = calendar.date(byAdding: dateComponents, to: currentDate)

非常适合我！

Answer 4

改编@warrenm对Swift的回答：

let currentDate = NSDate()
let dateComponents = NSDateComponents()
dateComponents.year = -13
let minDate = calendar.dateByAddingComponents(dateComponents, toDate: currentDate, options: NSCalendarOptions(rawValue: 0))
dateComponents.year = 30
let maxDate = calendar.dateByAddingComponents(dateComponents, toDate: currentDate, options: NSCalendarOptions(rawValue: 0))


dobPicker.maximumDate = maxDate
dobPicker.minimumDate = minDate

Answer 5

请尝试使用此代码Ios8 +

td

Answer 6

今天正在研究这个问题，并提出了一个扩展UIDatePicker的Swift 3解决方案。

extension UIDatePicker
{
    /// set the date picker values and set min/max
    /// - parameter date: Date to set the picker to
    /// - parameter unit: (years, days, months, hours, minutes...)
    /// - parameter deltaMinimum: minimum date delta in units
    /// - parameter deltaMaximum: maximum date delta in units
    /// - parameter animated: Whether or not to use animation for setting picker
    func setDate(_ date:Date, unit:NSCalendar.Unit, deltaMinimum:Int, deltaMaximum:Int, animated:Bool)
    {
        setDate(date, animated: animated)

        setMinMax(unit: unit, deltaMinimum: deltaMinimum, deltaMaximum: deltaMaximum)
    }

    /// set the min/max for the date picker (uses the pickers current date)
    /// - parameter unit: (years, days, months, hours, minutes...)
    /// - parameter deltaMinimum: minimum date delta in units
    /// - parameter deltaMaximum: maximum date delta in units
    func setMinMax(unit:NSCalendar.Unit, deltaMinimum:Int, deltaMaximum:Int)
    {
        if let gregorian = NSCalendar(calendarIdentifier:.gregorian)
        {
            if let minDate = gregorian.date(byAdding: unit, value: deltaMinimum, to: self.date)
            {
                minimumDate = minDate
            }

            if let maxDate = gregorian.date(byAdding: unit, value: deltaMaximum, to: self.date)
            {
                maximumDate = maxDate
            }
        }
    }
}

setDate方法将设置UIDatePicker个实例的三个值（日期，最小值，最大值）。

setMinMax仅设置最小值和最大值。最小值和最大值是使用选择器的当前日期计算的。

单位可以是以下值：

• .year
• .month
• ·天
• ·小时
• .minute
• 。第二

要设置加号和减去30年的日期，代码为：

var datePicker = UIDatePicker()
var date = Date()

datePicker.setDate(date, unit:.year, deltaMinimum:-30, deltaMaximum:30, animated:true)

Answer 7

将最大日期设置为今天的Swift 4.2

datePicker.maximumDate = Date()

Answer 8

将最小日期设置为今天的日期

@IBOutlet var datePicker: UIDatePicker!

datePicker.minimumDate = NSDate() as Date

这将使 DatePicker 自动滚动到当前日期，即使滚动到较旧的日期