如何使用swift找到给定月份和年份的天数

问题描述

我想找到给定月份和年份的总天数.示例:我想找到 year = 2015, month = 7 的总天数

I want to find the total number days on given month and year.Example: I want to find total number of days on year = 2015, month = 7

推荐答案

首先为给定的年月创建一个NSDate:

First create an NSDate for the given year and month:

let dateComponents = NSDateComponents()
dateComponents.year = 2015
dateComponents.month = 7

let calendar = NSCalendar.currentCalendar()
let date = calendar.dateFromComponents(dateComponents)!

然后使用 rangeOfUnit() 方法，如当月使用 iPhone SDK 的天数?:

Then use the rangeOfUnit() method, as described inNumber of days in the current month using iPhone SDK?:

// Swift 2:
let range = calendar.rangeOfUnit(.Day, inUnit: .Month, forDate: date)
// Swift 1.2:
let range = calendar.rangeOfUnit(.CalendarUnitDay, inUnit: .CalendarUnitMonth, forDate: date)

let numDays = range.length
print(numDays) // 31

Swift 3 (Xcode 8) 的更新:

let dateComponents = DateComponents(year: 2015, month: 7)
let calendar = Calendar.current
let date = calendar.date(from: dateComponents)!

let range = calendar.range(of: .day, in: .month, for: date)!
let numDays = range.count
print(numDays) // 31

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