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;

但我不能得到这个整数到我的日期格式..

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( - )减去和正值添加日期组件.

1.设置最短日期

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

2.设置最长日期

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

Answer 3

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 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

Swift 4.2

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 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