我正在尝试解析这个问题
2017-01-23T10:12:31.484Z
使用由ISO8601DateFormatter
提供的本地iOS 10
类但总是失败。如果字符串不包含毫秒,则创建Date
对象时没有问题。
我试过这个和许多options
组合,但总是失败...
let formatter = ISO8601DateFormatter()
formatter.timeZone = TimeZone(secondsFromGMT: 0)
formatter.formatOptions = [.withInternetDateTime, .withDashSeparatorInDate, .withColonSeparatorInTime, .withColonSeparatorInTimeZone, .withFullTime]
任何的想法?谢谢!
在macOS 10.13 / iOS 11之前,ISO8601DateFormatter
不支持日期字符串,包括毫秒。
解决方法是使用正则表达式删除毫秒部分。
let isoDateString = "2017-01-23T10:12:31.484Z"
let trimmedIsoString = isoDateString.replacingOccurrences(of: "\\.\\d+", with: "", options: .regularExpression)
let formatter = ISO8601DateFormatter()
let date = formatter.date(from: trimmedIsoString)
在macOS 10.13+ / iOS 11+中,添加了一个新选项以支持小数秒:
static var withFractionalSeconds: ISO8601DateFormatter.Options { get }
let isoDateString = "2017-01-23T10:12:31.484Z"
let formatter = ISO8601DateFormatter()
formatter.formatOptions = [.withInternetDateTime, .withFractionalSeconds]
let date = formatter.date(from: isoDateString)
也许这有助于解码略有不同的格式:
extension JSONDecoder {
enum DateDecodeError: String, Error {
case invalidDate
}
static var bestDateAttemptDecoder: JSONDecoder {
let decoder = JSONDecoder()
decoder.dateDecodingStrategy = .custom({ (decoder) -> Date in
let container = try decoder.singleValueContainer()
if let dateSecs = try? container.decode(Double.self) {
return Date(timeIntervalSince1970: dateSecs)
}
if let dateSecs = try? container.decode(UInt.self) {
return Date(timeIntervalSince1970: TimeInterval(dateSecs))
}
let dateStr = try container.decode(String.self)
let isoFormatter = ISO8601DateFormatter()
isoFormatter.formatOptions = [.withInternetDateTime, .withFractionalSeconds]
if let date = isoFormatter.date(from: dateStr) {
return date
}
isoFormatter.formatOptions = [.withInternetDateTime ]
if let date = isoFormatter.date(from: dateStr) {
return date
}
log.warning("Cannot decode date");
throw DateDecodeError.invalidDate
})
return decoder
}
}
来自:https://gist.github.com/th3m477/442a0d1da6354dd3b84e3b71df5dca6a
几个月前我遇到过同样的问题。这是我的解决方案供参考:
// *****************************************
// MARK: - Formatter extension
// *****************************************
extension Formatter {
static let iso8601: ISO8601DateFormatter = {
let formatter = ISO8601DateFormatter()
formatter.timeZone = TimeZone.current
formatter.formatOptions = [.withInternetDateTime, .withFractionalSeconds]
return formatter
}()
static let iso8601NoSecond: ISO8601DateFormatter = {
let formatter = ISO8601DateFormatter()
formatter.timeZone = TimeZone.current
formatter.formatOptions = [.withInternetDateTime]
return formatter
}()
}
// *****************************************
// MARK: - ISO8601 helper
// *****************************************
func getDateFrom(DateString8601 dateString:String) -> Date?
{
if let date = Formatter.iso8601.date(from: dateString) {
return date
}
if let date = Formatter.iso8601NoSecond.date(from: dateString) {
return date
}
return nil
}
// *****************************************
// usage
// *****************************************
let d = getDateFrom(DateString8601: "2017-01-23T10:12:31.484Z")
print("2017-01-23T10:12:31.484Z millis= ", d?.timeIntervalSinceReferenceDate)
let d2 = getDateFrom(DateString8601: "2017-01-23T10:12:31Z")
print("2017-01-23T10:12:31Z millis= ", d2?.timeIntervalSinceReferenceDate)
// *****************************************
// result
// *****************************************
2017-01-23T10:12:31.484Z millis= Optional(506859151.48399997)
2017-01-23T10:12:31Z millis= Optional(506859151.0)