UIDatePicker，根據今天的日期設置最大和最小日期

Question

如果我有一個UIDatePicker，並且我希望將最小和最大日期範圍設置在三十年前和未來三十年之間，我將如何設置它？

Answer 1

未經測試，但您可能需要這樣的東西。

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]; 

您可以使用此行代碼來設置最大日（今天）。

Answer 3

請試試這個代碼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

適應@ warrenm的回答讓斯威夫特：

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

今天看這個問題，並與斯威夫特3擴展的UIDatePicker的解決方案上來。

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方法將設置UIDatePicker實例的三個值（日期，最小值，最大值）。

setMinMax只設置最小值和最大值。最小值和最大值使用選擇器的當前日期進行計算。

單元可以是以下值：

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

用pl設定日期我們再減去三十多年來，代碼如下：

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) 

爲我的偉大工程！