xcode 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?

提问by Sam

i want to get the separate Strings values of day,Month,year from a date picker. and assign these three values to a 3 variables. I have done upto this:

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一个 3 个变量。我已经做到了这一点：

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

this is my few codes and i can set the date text as a string to the button title.Now i want days,month and year separately. How can i do this..??

这是我的几个代码，我可以将日期文本设置为按钮标题的字符串。现在我想要分别天、月和年。我怎样才能做到这一点..？？

回答by Julien Kode

You have 2 ways to do that, depends if you want to see the number of the current month or his name:

您有两种方法可以做到这一点，取决于您是想查看当前月份的编号还是他的姓名：

• Use Calendar
• Use DateFormatter

• 使用日历
• 使用日期格式化程序

With Calendar:

带日历：

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)
}

With DateFormatter:

使用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))

With DateFormatteryou have more choice of formatting because your manage the output format

使用DateFormatter，您有更多的格式选择，因为您管理输出格式

回答by Nirav D

You can use NSDateComponentsfor that.

你可以用NSDateComponents它。

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)

回答by Yun CHEN

Swift 3:

斯威夫特 3：

   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)"
        }
    }