在下面的图片中,您可以看到我写的代码和所有变量的值：
class fun getCurrentShortDate() -> String {
var todaysDate = NSDate()
var dateFormatter = NSDateFormatter()
dateFormatter.dateFormate = "dd-MM-yyyy"
var DateInFormat = dateFormatter.stringFromDate(todaysDate)
return DateInFormat
}
正如你可以看到当前日期被发现没有问题,但是当我尝试将NSDate更改为字符串时,它不会这样做.
更新：Xcode 8.2•Swift 3.0.2
extension DateFormatter {
convenience init(dateStyle: Style) {
self.init()
self.dateStyle = dateStyle
}
convenience init(timeStyle: Style) {
self.init()
self.timeStyle = timeStyle
}
convenience init(dateStyle: Style,timeStyle: Style) {
self.init()
self.dateStyle = dateStyle
self.timeStyle = timeStyle
}
}
extension Date {
static let shortDate = DateFormatter(dateStyle: .short)
static let fullDate = DateFormatter(dateStyle: .full)
static let shortTime = DateFormatter(timeStyle: .short)
static let fullTime = DateFormatter(timeStyle: .full)
static let shortDateTime = DateFormatter(dateStyle: .short,timeStyle: .short)
static let fullDateTime = DateFormatter(dateStyle: .full,timeStyle: .full)
var fullDate: String { return Date.fullDate.string(from: self) }
var shortDate: String { return Date.shortDate.string(from: self) }
var fullTime: String { return Date.fullTime.string(from: self) }
var shortTime: String { return Date.shortTime.string(from: self) }
var fullDateTime: String { return Date.fullDateTime.string(from: self) }
var shortDateTime: String { return Date.shortDateTime.string(from: self) }
}
测试
print(Date().fullDate) // "Friday,May 26,2017\n" print(Date().shortDate) // "5/26/17\n" print(Date().fullTime) // "10:16:24 AM Brasilia Standard Time\n" print(Date().shortTime) // "10:16 AM\n" print(Date().fullDateTime) // "Friday,2017 at 10:16:24 AM Brasilia Standard Time\n" print(Date().shortDateTime) // "5/26/17,10:16 AM\n"