我的数据包含日期字符串。
通常会出现在Jan。 1966年3月#39;类型格式,但由于国际差异,它可能并不总是那样。
我需要读取数据并将其转换为标准日期字符串(' YYYY-MM-DD')。
基本上这就是我到目前为止所做的:
var dataString = 'Jan. 3, 1966'
var dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = # I DON'T KNOW THE EXACT INPUT FORMAT !
let dateValue = dateFormatter.dateFromString(dataString)
答案 0 :(得分:23)
Xcode 9•Swift 4 或 Xcode 8.3.2•Swift 3.1
您可以使用NSDataDetector,如下所示:
extension String {
var nsString: NSString { return self as NSString }
var length: Int { return nsString.length }
var nsRange: NSRange { return NSRange(location: 0, length: length) }
var detectDates: [Date]? {
return try? NSDataDetector(types: NSTextCheckingResult.CheckingType.date.rawValue)
.matches(in: self, range: nsRange)
.flatMap{$0.date}
}
}
extension Collection where Iterator.Element == String {
var dates: [Date] {
return flatMap{$0.detectDates}.flatMap{$0}
}
}
测试:
let dateStrings = ["January 3, 1966","Jan 3, 1966", "3 Jan 1966"]
for dateString in dateStrings {
if let dateDetected = dateString.detectDates?.first {
print(dateDetected)
// 1966-01-03 14:00:00 +0000
// 1966-01-03 14:00:00 +0000
// 1966-01-03 14:00:00 +0000
}
}
let dateStrings = ["January 3, 1966","Jan 3, 1966", "3 Jan 1966"]
for date in dateStrings.dates {
print(date)
// 1966-01-03 14:00:00 +0000
// 1966-01-03 14:00:00 +0000
// 1966-01-03 14:00:00 +0000
}
答案 1 :(得分:0)
在Swift 4,xcode 9中进行了测试
extension String {
var detectDate: Date? {
let detector = try? NSDataDetector(types: NSTextCheckingResult.CheckingType.date.rawValue)
let matches = detector?.matches(in: self, options: [], range: NSMakeRange(0, self.utf16.count))
return matches?.first?.date
}
}
测试:
print("2018-11-04T23:59:00+00:00".detectDate ?? "")
// 2018-11-04 10:00:00 +0000
print("2018/11/4".detectDate ?? "")
// 2018-11-04 10:00:00 +0000