Calender.Component中的Quarter Component是做什麼的？ （Swift）

Question

我想在我的iOS應用程序中使用年度季度，但發現.quarter組件什麼都不做。我也沒有找到關於它的文檔。

調用print(Calendar.current.date(byAdding: .quarter, value: 1, to: Date()))只是打印當前日期。我預計它會增加3個月呢？

Answer 1

你會認爲你不會 - 但不會，看起來有些東西壞了。

在操場的快速測試顯示它的所有作品，直到您使用.quarter：在

//: Playground - noun: a place where people can play 

import UIKit 

let result = Calendar.current.date(byAdding: .quarter, value: 1, to: Date()) 

print (result) 

let calendar1 = Calendar.current 
let now1 = Date() 
let newDate1 = calendar1.date(byAdding: .minute, value: 1, to: now1) 
let newDate2 = calendar1.date(byAdding: .hour, value: 1, to: now1) 
let newDate3 = calendar1.date(byAdding: .day, value: 1, to: now1) 
let newDate4 = calendar1.date(byAdding: .month, value: 1, to: now1) 
let newDate5 = calendar1.date(byAdding: .month, value: 3, to: now1) 
let newDate6 = calendar1.date(byAdding: .quarter, value: 1, to: now1) 

結果：

"Sep 27, 2016, 3:30 PM" 

"Optional(2016-09-27 05:30:03 +0000)\n" 

gregorian (current) 
"Sep 27, 2016, 3:30 PM" 
"Sep 27, 2016, 3:31 PM" 
"Sep 27, 2016, 4:30 PM" 
"Sep 28, 2016, 3:30 PM" 
"Oct 27, 2016, 3:30 PM" 
"Dec 27, 2016, 3:30 PM" 
"Sep 27, 2016, 3:30 PM" 

它看起來像，因爲它矗立在Xcode 8.0（8A218a）你將使用上述newDate5行中顯示的月份和值3。