在Swift中使用NSDate组件 [英] Working with NSDate components in Swift
本文介绍了在Swift中使用NSDate组件的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有一个日期,我需要拆分一些组件。例如
I have a date that I need to split in some components. for example
let components = NSCalendarUnit.CalendarUnitDay | NSCalendarUnit.CalendarUnitHour
let date = calendar.components(components, fromDate: aDate, toDate: NSDate(), options: nil)
var dateToPrint = "\(date.day) days \(date.hour) hours"
dateToPrint将是从aDate到现在的天数和小时数。但如果我想要几周而不是几天
dateToPrint will be the number of days and hours from aDate to now. But if i want the number of weeks instead of days
let components = NSCalendarUnit.CalendarUnitWeek | NSCalendarUnit.CalendarUnitHour
let date = calendar.components(components, fromDate: aDate, toDate: NSDate(), options: nil)
var dateToPrint = "\(date.week) weeks \(date.hour) hours"
date.week不存在。那么我怎么解决这个问题?
date.week does not exist. So how I could resolve this?
推荐答案
Xcode 8.3.2•Swift 3.1
extension Date {
func xDays(_ x: Int) -> Date {
return Calendar.current.date(byAdding: .day, value: x, to: self)!
}
func xWeeks(_ x: Int) -> Date {
return Calendar.current.date(byAdding: .weekOfYear, value: x, to: self)!
}
var weeksHoursFromToday: DateComponents {
return Calendar.current.dateComponents( [.weekOfYear, .hour], from: self, to: Date())
}
var relativeDateString: String {
var result = ""
if let weeks = weeksHoursFromToday.weekOfYear,
let hours = weeksHoursFromToday.hour,
weeks > 0 {
result += "\(weeks) week"
if weeks > 1 { result += "s" }
if hours > 0 { result += " and " }
}
if let hours = weeksHoursFromToday.hour, hours > 0 {
result += "\(hours) hour"
if hours > 1 { result += "s" }
}
return result
}
}
let today = Date() // "May 1, 2017, 9:29 PM"
let yesterday = Date().xDays(-1) // "Apr 30, 2017, 9:29 PM"
let twoWeeksAgo = Date().xWeeks(-2) // "Apr 17, 2017, 9:29 PM"
let anotherDate = DateComponents(calendar: .current, year: 2013, month: 12, day: 4).date! // "Dec 4, 2013, 12:00 AM"
let anotherDate2 = DateComponents(calendar: .current, year: 2012, month: 12, day: 3).date! // "Dec 3, 2012, 12:00 AM"
yesterday.relativeDateString // "24 hours"
twoWeeksAgo.relativeDateString // "2 weeks"
anotherDate.relativeDateString // "177 weeks and 141 hours"
anotherDate2.relativeDateString // "230 weeks and 21 hours"
yesterday.relativeDateString // "24 hours"
twoWeeksAgo.relativeDateString // "2 weeks"
anotherDate.relativeDateString // "177 weeks and 141 hours"
anotherDate2.relativeDateString // "230 weeks and 21 hours"
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