Swift: 如何从日期选择器中获取日期、月份和年份的字符串值？

Question

我想从日期选择器中获取日、月、年的单独字符串值。并将这三个值分配给 3 个变量。我已经做到了：

@IBAction func doneClicked(sender: UIButton) {
    let dateFormatter = NSDateFormatter()
    dateFormatter.dateFormat = GlobalConfiguration.getDatePickerFormat()
    let formattedDate = dateFormatter.stringFromDate(self.datePicker.date)
    self.delegate?.datePickerDidSelect(formattedDate)
    }

这是我的几个代码，我可以将日期文本设置为按钮的字符串 title.Now 我需要分别设置日、月和年。我该怎么做...？

Answer 1

Swift3:

   if let date = self.datePicker.date {
        let components = NSCalendar.current.dateComponents([.day,.month,.year],from:date)
        if let day = components.day, let month = components.month, let year = components.year {
            let dayString = "\(day)"
            let monthString = "\(month)"
            let yearString = "\(year)"
        }
    }

Answer 2

您可以使用 NSDateComponents。

let dateComponents = NSCalendar.currentCalendar().components([.Year, .Month, .Day], fromDate: self.datePicker.date)
let year = String(dateComponents.year)
let month = String(dateComponents.month)
let day = String(dateComponents.day)

Answer 3

您有两种方法可以做到这一点，具体取决于您是想查看当前月份的数字还是他的姓名：

使用Calendar
使用DateFormatter

与Calendar:

let calendar = Calendar.current
let components = calendar.dateComponents([.day,.month,.year], from: self.datePicker.date))
if let day = components.day, let month = components.month, let year = components.year {
    let dayString = String(day)
    let monthString = String(month)
    let yearString = String(year)
}

与DateFormatter:

let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy"
let year: String = dateFormatter.string(from: self.datePicker.date))
dateFormatter.dateFormat = "MM"
let month: String = dateFormatter.string(from: self.datePicker.date))
dateFormatter.dateFormat = "dd"
let day: String = dateFormatter.string(from: self.datePicker.date))

使用 DateFormatter 您可以选择更多格式，因为您可以管理输出格式

Swift: 如何从日期选择器中获取日期、月份和年份的字符串值？

Swift: How to get string values of days, months and year from a date picker?

xcode

calendar

uidatepicker

ios

swift