如何减去日期分量? [英] How to subtract date components?

问题描述

今天是星期五，根据 NSCalendar ，它是 6 .我可以通过使用以下

As today is Friday, which is 6 according to NSCalendar. I can get this by using the following

Calendar.current.component(.weekday, from: Date())

如何获取上周 Saturday 的工作日部分，应该是 7 ?

How do I get weekday component of Saturday last week, which should be 7?

如果我执行 Calendar.current.component(.weekday，来自:Date())-6 .我收到 0 无效的分量.

If I do Calendar.current.component(.weekday, from: Date()) - 6 . I am getting 0 which is not valid component.

推荐答案

尝试一下，您必须先获取日期，然后再从中减去:

Try this, you have to get the date first then subtract again from it:

var dayComp = DateComponents(day: -6)
let date = Calendar.current.date(byAdding: dayComp, to: Date())
Calendar.current.component(.weekday, from: date!)

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