Question

这是一段在早期版本的swift中运行的代码。它现在给出了一个错误（无法转换类型的值＆＃39; NSDate＆＃39;键入＆＃39; NSDate.Date＆＃39;在强制中）

extension NSDate {
struct Date {
    static let formatterISO8601: DateFormatter = {
        let formatter = DateFormatter()
        formatter.calendar = NSCalendar(calendarIdentifier: NSCalendar.Identifier.ISO8601)! as Calendar
        formatter.locale = NSLocale.current
        formatter.timeZone = NSTimeZone(forSecondsFromGMT: 0) as TimeZone!
        formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssXXX"
        return formatter
    }()
}


var formattedISO8601: String { return Date.formatterISO8601.string(from: self as Date) }

}

Answer 1

问题是在Swift 3中已经有一个名为Date的结构定义。

所以你可以做的是将你的结构名称更改为MyDate或其他内容，然后你就可以了。

最好使用新的Date，Calendar和TimeZone代替NSDate，NSCalendar和NSTimeZone。

或者像这样扩展Date。

extension Date {

    static let formatterISO8601: DateFormatter = {
        let formatter = DateFormatter()
        formatter.calendar = Calendar(identifier: .iso8601)
        formatter.locale = Locale.current
        formatter.timeZone = TimeZone(secondsFromGMT: 0)
        formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssXXX"
        return formatter
    }()

    var formattedISO8601: String { return Date.formatterISO8601.string(from: self) }
}

Answer 2

NSDate和Date的扩展。

extension Date {
    static let formatterISO8601: DateFormatter = {
        let formatter = DateFormatter()
        formatter.calendar = NSCalendar(calendarIdentifier: NSCalendar.Identifier.ISO8601)! as Calendar
        formatter.locale = NSLocale.current
        formatter.timeZone = NSTimeZone(forSecondsFromGMT: 0) as TimeZone!
        formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssXXX"
        return formatter
    }()

    func formattedISO8601() -> String {
        return Date.formatterISO8601.string(from: self)
    }
}

extension NSDate {
    func formattedISO8601() -> String {
        return Date.formatterISO8601.string(from: self as Date)
    }
}

并像这样使用它......

// NSDate
let nsdate = NSDate.init()
let formattedDate = nsdate.formattedISO8601()

// Date
let date = Date.init()
let formattedNsDate = date.formattedISO8601()

Answer 3

试试这个

   extension Date {

    static let formatterISO8601: DateFormatter = {
      let formatter = DateFormatter()
      formatter.calendar = NSCalendar(calendarIdentifier: NSCalendar.Identifier.ISO8601)! as Calendar
      formatter.locale = NSLocale.current
      formatter.timeZone = NSTimeZone(forSecondsFromGMT: 0) as TimeZone!
      formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssXXX"
      return formatter
    }()



  var formattedISO8601: String { return Date.formatterISO8601.string(from: self)
  }
}

NSDate扩展无法正常工作

3 个答案: