swift – NSDateFormatter.stringFromDate(NSDate())返回空字符串

概述在下面的图片中,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 Date 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}@H_301_2@  
Variable values
  
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    }}@H_301_2@  
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) }}@H_301_2@  
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"@H_301_2@          总结       
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