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和未来三十年之间，我将如何设置？

Answer 1

未经测试，但您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 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];

您可以使用这行代码来设置最大日期（今天）。

Answer 3

我的 swift 4 版本的 @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)

对我来说非常有用！

Answer 4

将最大日期设置为今天 Swift 4.2

datePicker.maximumDate = Date()

Answer 5

调整 @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 6

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

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 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：

• .年
• .月 .
• 日 .
• 小时
• .分钟
• .秒

要设置正负三十年的日期，代码为：

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

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

Answer 7

请尝试此代码 Ios8+

NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
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];

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