斯威夫特:在“特定日期"之前获得 30 天 [英] Swift: Get 30 days before 'Specific Date'

问题描述

我在显示特定日期时遇到问题.在这种情况下，我的 API (06/16/2015) 有一个随机日期，该日期总是在变化.我把它放入变量名 toDate 与 Date 类型.我需要在 toDate 之前为我的 fromDate 变量获取 30 天.

I have a problem about showing specific date. Here the case, I have a random date from my API (06/16/2015) that always change. I put it into variable name toDate with Date type. I need to get 30 days before the toDate for my fromDate variable.

我阅读了这个 但它仍然无法正常工作.注意:我在这个控制器中没有任何 DatePicker.

I read this but it's still not working. Note: I don't have any DatePicker in this controller.

推荐答案

给你:

let toDate = `your date object`
let fromDate = Calendar.current.date(byAdding: .month, value: -1, to: toDate)

or, 
// If you want to have exactly 30 days before
let fromDate = Calendar.current.date(byAdding: .day, value: -30, to: toDate)

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