swift - 日期选择器，用户无法返回到之前的日期 Swift

Question

我有日期选择器

我已经设置了当前日期，并且我想让用户无法滚动回之前的日期？允许吗？

Answer 1

正如文档所述 here您只需设置 UIDatePicker 的选项 minimumDate。

这是一个例子

var datePicker = UIDatePicker() //your UIDatePicker
datePicker.minimumDate = Date() //the minimum date is now. Only future date is allowed

另一种情况如下

var datePicker = UIDatePicker() //your UIDatePicker

//create a gregorian calendar
let calendar = NSCalendar(calendarIdentifier: NSCalendarIdentifierGregorian)!

// set the timezone
calendar.timeZone = NSTimeZone(name: "UTC")!

// create and set the component (for your minimum date value)
let components: NSDateComponents = NSDateComponents()
components.calendar = calendar
components.year = -100

// obtain the minimum NSDate, according to the defined components
//it will result as the difference of the years (components.year) from now (NSDate())
let minDate100YearsAgo: NSDate = calendar.dateByAddingComponents(components, toDate: NSDate(), options: NSCalendarOptions(rawValue: 0))!

//then you add this to the UIDatePicker
datePicker.minimumDate = minDate100YearsAgo