Swift カレンダー，日付系備忘録

Swift2.0と1系でなんか違うので備忘録。
まだまだあるので，必要に応じて適宜追記していく。

※ Playground レベルでしかみてない。

Swift

import UIKit

let calendar = NSCalendar(identifier: NSCalendarIdentifierGregorian)!
// NSDate() でもいいけど訳あり・・・
var date = calendar.dateWithEra(1, year: 2015, month: 12, day: 1, hour: 0, minute: 0, second: 0, nanosecond: 0)!

// Swift 2系から？
let unitFlags: NSCalendarUnit = [ .Year,
    .Month,
    .Day,
    .Weekday,
    .Hour,
    .Minute,
    .Second ]

let year = calendar.component(.Year, fromDate: date)
let month = calendar.component(.Month, fromDate: date)
let day = calendar.component(.Day, fromDate: date)
String(year) + "年" + String(month) + "月" + String(day) + "日"

// 何曜か(weekdayって1からだったっけ?)
var components = calendar.components(unitFlags, fromDate:date)
var weekDay = components.weekday

// おまけ
let dayArray = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"]
var nowDay = dayArray[weekDay-1]

// 指定月は何日あるか
var range : NSRange = calendar.rangeOfUnit(.Day, inUnit:.Month , forDate:date)
var last =  range.length;

"Dec 1, 2015, 12:00 AM"

"2015年12月1日"

3

"Tue"

31