UIDatePicker 中的最小和最大日期

Question

我想从日期选择器获取最小和最大日期，但最小日期应为当前日期的"-18"，最大日期应为当前日期的"-100"。

假设当前年份是 2018 年，那么我想要最小日期 2000 和最大日期 1918。

到目前为止，我所做的是：

NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components = [gregorian components:NSYearCalendarUnit fromDate:[NSDate date]];
NSInteger year = [components year];
int mindt = year - 18;
int maxdt = year -100;
   // NSDate * MinDate = [components year] - 18;
   // NSDate * MaxDate =  [components year] - 100;
   // self.datePicker.minimumDate = MinDate;
   // self.datePicker.maximumDate = MaxDate;

但我无法将这个整数转换为我的日期格式。

Answer 1

试试这个：

NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDate *currentDate = [NSDate date];
NSDateComponents *comps = [[NSDateComponents alloc] init];
[comps setYear:-18];
NSDate *minDate = [gregorian dateByAddingComponents:comps toDate:currentDate  options:0];
[comps setYear:-150];
NSDate *maxDate = [gregorian dateByAddingComponents:comps toDate:currentDate  options:0];
[comps release];
self.datePicker.minimumDate = minDate;
self.datePicker.maximumDate = maxDate;

它可以很容易地翻译成 Swift 4.2：

    let calendar = Calendar(identifier: .gregorian)
    let currentDate = Date()
    var components = DateComponents()
    components.calendar = calendar
    components.year = -18
    components.month = 12
    let maxDate = calendar.date(byAdding: components, to: currentDate)!
    components.year = -150
    let minDate = calendar.date(byAdding: components, to: currentDate)!
    picker.minimumDate = minDate
    picker.maximumDate = maxDate

Answer 2

看看这个 Swift 版本。用户负值 （-） 减去，正值添加日期分量。

1. 设置最短日期

 yourDatePicker.minimumDate = Calendar.current.date(byAdding: .year, value: -1, to: Date())

2. 设置最大日期

 yourDatePicker.maximumDate = Calendar.current.date(byAdding: .year, value: 1, to: Date())

Answer 3

Swift 5.1

extension UIDatePicker {
    func set18YearValidation() {
        let currentDate: Date = Date()
        var calendar: Calendar = Calendar(identifier: Calendar.Identifier.gregorian)
        calendar.timeZone = TimeZone(identifier: "UTC")!
        var components: DateComponents = DateComponents()
        components.calendar = calendar
        components.year = -18
        let maxDate: Date = calendar.date(byAdding: components, to: currentDate)!
        components.year = -150
        let minDate: Date = calendar.date(byAdding: components, to: currentDate)!
        self.minimumDate = minDate
        self.maximumDate = maxDate
    } }

Answer 4

这就是 2017 年的样子（Swift 3）

    var components = DateComponents()
    components.year = -100
    let minDate = Calendar.current.date(byAdding: components, to: Date())
    components.year = -18
    let maxDate = Calendar.current.date(byAdding: components, to: Date())
    datePicker.minimumDate = minDate
    datePicker.maximumDate = maxDate

Answer 5

在 Swift 2.1 中：

    let currentDate: NSDate = NSDate()
    let calendar: NSCalendar = NSCalendar(calendarIdentifier: NSCalendarIdentifierGregorian)!
    // let calendar: NSCalendar = NSCalendar.currentCalendar()
    calendar.timeZone = NSTimeZone(name: "UTC")!
    let components: NSDateComponents = NSDateComponents()
    components.calendar = calendar
    components.year = -18
    let minDate: NSDate = calendar.dateByAddingComponents(components, toDate: currentDate, options: NSCalendarOptions(rawValue: 0))!
    components.year = -150
    let maxDate: NSDate = calendar.dateByAddingComponents(components, toDate: currentDate, options: NSCalendarOptions(rawValue: 0))!
    self.dateOfBirthUIDatePicker.minimumDate = minDate
    self.dateOfBirthUIDatePicker.maximumDate = maxDate
    print("minDate: (minDate)")
    print("maxDate: (maxDate)")

Answer 6

Swift 3.0

 let gregorian: NSCalendar = NSCalendar(calendarIdentifier: NSCalendar.Identifier.gregorian)!
    let currentDate: Date = Date()
    let components: NSDateComponents = NSDateComponents()
    components.year = -150
    let minDate: Date = gregorian.date(byAdding: components as DateComponents, to: currentDate, options: NSCalendar.Options(rawValue: 0))!
    components.year = -16
    let maxDate: Date = gregorian.date(byAdding: components as DateComponents, to: currentDate, options: NSCalendar.Options(rawValue: 0))!
    self.datepicker.minimumDate = minDate
    self.datepicker.maximumDate = maxDate

Answer 7

**UIDatePicker中的最小和最大日期：#Swift

如果要选择两个日期值之间的最小和最大日期，请使用以下简单代码：**

例如：最短日期：

01-04-2017和最长日期：31-03-2018

let calendar = Calendar.current
var minDateComponent = calendar.dateComponents([.day,.month,.year], from: Date())
minDateComponent.day = 01
minDateComponent.month = 04
minDateComponent.year = 2017
let minDate = calendar.date(from: minDateComponent)
print(" min date : (String(describing: minDate))")
var maxDateComponent = calendar.dateComponents([.day,.month,.year], from: Date())
maxDateComponent.day = 0
maxDateComponent.month = 03 + 1
maxDateComponent.year = 2018
let maxDate = calendar.date(from: maxDateComponent)
print("max date : (String(describing: maxDate))")
picker.minimumDate = minDate! as Date
picker.maximumDate =  maxDate! as Date

Answer 8

在目标 C 中，NSDateComponents *comps = [[NSDateComponents alloc] init];

NSDateComponents *components = [calendar components:(NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay) fromDate:[NSDate date]];
NSInteger year = components.year;
NSInteger month = components.month;
NSInteger day = components.day;
NSInteger minimumYear = year - 1900;//Given some year here for example
NSInteger minimumMonth = month - 1;
NSInteger minimumDay = day - 1;
[comps setYear:-minimumYear];
[comps setMonth:-minimumMonth];
[comps setDay:-minimumDay];
NSDate *minDate = [calendar dateByAddingComponents:comps toDate:currentDate options:0];
[datePicker setMinimumDate:minDate];
[datePicker setMaximumDate:[NSDate date]];

最短日期为 1900 年 1 月 1 日。我希望它对你们都有用..:)

在 Swift 2.0 或更高版本中

    let calendar = NSCalendar(calendarIdentifier:NSCalendarIdentifierGregorian);
    let todayDate = NSDate()
    let components = calendar?.components([NSCalendarUnit.Year,NSCalendarUnit.Month,NSCalendarUnit.Day], fromDate: todayDate)
    let minimumYear = (components?.year)! - 1900
    let minimumMonth = (components?.month)! - 1
    let minimumDay = (components?.day)! - 1
    let comps = NSDateComponents();
    comps.year = -minimumYear
    comps.month = -minimumMonth
    comps.day = -minimumDay
    let minDate = calendar?.dateByAddingComponents(comps, toDate: todayDate, options: NSCalendarOptions.init(rawValue: 0))
    datePicker.minimumDate = minDate
    datePicker.maximumDate = datePicker.date

Answer 9

另一种情况：

假设我想将出生日期显示为日期选择器，Dob 在 1/1/1980 到 1/1/2000 的范围内。

@IBOutlet var datePicker: UIDatePicker!
override func viewDidLoad() {
        super.viewDidLoad()        
        datePicker.datePickerMode = UIDatePickerMode.date       

        // 01/01/1980 to 01/01/2000
        let calendar = Calendar.current
        var minDateComponent = calendar.dateComponents([.day,.month,.year], from: Date())
        minDateComponent.day = 01
        minDateComponent.month = 01
        minDateComponent.year = 1980
        let minDate = calendar.date(from: minDateComponent)
        print(" min date : (minDate)")
        var maxDateComponent = calendar.dateComponents([.day,.month,.year], from: Date())
       maxDateComponent.day = 01
        maxDateComponent.month = 01
        maxDateComponent.year = 2000
        let maxDate = calendar.date(from: maxDateComponent)
        print("max date : (maxDate)")
        self.datePicker.minimumDate = minDate! as Date
        self.datePicker.maximumDate =  maxDate! as Date
}

Answer 10

Swift 4.1

我已经基于日历为所有类型的限制创建了我的扩展。

extension UIDatePicker {
    func setLimit(forCalendarComponent component:Calendar.Component, minimumUnit min: Int, maximumUnit max: Int) {
        let currentDate: Date = Date()
        var calendar: Calendar = Calendar(identifier: Calendar.Identifier.gregorian)
        guard let timeZone = TimeZone(identifier: "UTC") else { return }
        calendar.timeZone = timeZone
        var components: DateComponents = DateComponents()
        components.calendar = calendar
        components.setValue(-min, for: component)
        if let maxDate: Date = calendar.date(byAdding: components, to: currentDate) {
            self.maximumDate = maxDate
        }
        components.setValue(-max, for: component)
        if let minDate: Date = calendar.date(byAdding: components, to: currentDate) {
            self.minimumDate = minDate
        }
    }
}

我们可以按如下方式使用它：

self.datePicker.setLimit(forCalendarComponent: .year, minimumUnit: 13, maximumUnit: 100)

Answer 11

Swift 4.0

UIDatePicker Extension

extension UIDatePicker {
    func set18YearValidation() {
        let currentDate: NSDate = NSDate()
        let calendar: NSCalendar = NSCalendar(calendarIdentifier: NSCalendar.Identifier.gregorian)!
        calendar.timeZone = NSTimeZone(name: "UTC")! as TimeZone
        let components: NSDateComponents = NSDateComponents()
        components.calendar = calendar as Calendar
        components.year = -18
        let maxDate: NSDate = calendar.date(byAdding: components as DateComponents, to: currentDate as Date, options: NSCalendar.Options(rawValue: 0))! as NSDate
        components.year = -150
        let minDate: NSDate = calendar.date(byAdding: components as DateComponents, to: currentDate as Date, options: NSCalendar.Options(rawValue: 0))! as NSDate
        self.minimumDate = minDate as Date
        self.maximumDate = maxDate as Date
    } }

Answer 12

如果要将当前日期设置为日期选择器的最小值，请使用以下代码行：

datePicker.minimumDate = Date()