Swift：在“特定日期”之前30天 [英] Swift: Get 30 days before 'Specific Date'

问题描述

我对显示特定日期有疑问。在这种情况下，我会从我的API（06/16/2015）中获得一个随机日期，该日期总是会变化。我将其放入具有日期类型的变量名称 toDate 中。对于我的 fromDate 变量，我需要在 toDate 前30天。我阅读了此但仍然无法正常工作。

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. I read this but its still not working. Thanks in Advance.

*注意：我在此控制器中没有任何DatePicker

*Note : I dont have any DatePicker in this controller

推荐答案

在这里：

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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