如何使用Swift获得一天中的小时? [英] How to get the hour of the day with Swift?

问题描述

我将如何在Swift中获得一天中的时间. 我已经尝试过NSCalendar和NSDateComponents，但是恐怕我只是从Swift开始.

How would I get the hour of the day in Swift. I have tried NSCalendar and NSDateComponents, but I'm afraid I'm just starting with Swift.

推荐答案

Swift 5.0/4.0/3.0

let hour = Calendar.current.component(.hour, from: Date())

 

或者，如果您对12 hour AM/PM日期格式感兴趣，请使用 NSDateFormatter

Or, if you're interested in 12 hour AM/PM date format, then use NSDateFormatter

let formatter = DateFormatter()
formatter.dateFormat = "hh a" // "a" prints "pm" or "am"
let hourString = formatter.string(from: Date()) // "12 AM"

如果需要分钟，秒和其他时间，请执行以下操作

If you want minutes, seconds and others, do as following

let date = Date() // save date, so all components use the same date
let calendar = Calendar.current // or e.g. Calendar(identifier: .persian)

let hour = calendar.component(.hour, from: date)
let minute = calendar.component(.minute, from: date)
let second = calendar.component(.second, from: date)

在 Apple文档中查看可用的组件:

Check out available components on Apple docs:

.era, .year, .month, .day, .hour, .minute, .second,
.weekday, .weekdayOrdinal, .quarter, weekOfMonth, .weekOfYear,
.yearForWeekOfYear, .nanosecond, .calendar, .timezone

Swift 2.0

let hour = NSCalendar.currentCalendar().component(.Hour, fromDate: NSDate())

Swift 1.0

let hour = NSCalendar.currentCalendar().component(.CalendarUnitHour, fromDate: NSDate())

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