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在三十年前和未来三十年之间，我将如何设置它？

Answer 1

未经测试，但您可能需要这样的东西。

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]; 

Answer 2

m_datePicker.maximumDate = [NSDate date]; 

您可以使用此行代码来设置最大日（今天）。

Answer 3

请试试这个代码iOS8上+

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 4

适应@ warrenm的回答让斯威夫特：

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

今天看这个问题，并与斯威夫特3扩展的UIDatePicker的解决方案上来。

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 
      } 
     } 
    } 
} 

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

setMinMax只设置最小值和最大值。最小值和最大值使用选择器的当前日期进行计算。

单元可以是以下值：

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

用pl设定日期我们再减去三十多年来，代码如下：

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

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

Answer 6

我@toddg雨燕4版本是：

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) 

为我的伟大工程！