想必你已经有了一个Date?

let weekday = Calendar.current.component(.weekday, from: myDate)

也许您想要工作日的名称?

Maybe you want the name of the weekday?

let f = DateFormatter()

f.weekdaySymbols[Calendar.current.component(.weekday, from: Date()) - 1]

最后添加 -1 是因为 Calendar.current.component(.weekday, from: Date()) 返回 1-7 之间的值，但 weekdaySymbols 需要数组索引.

The -1 is added at the end because Calendar.current.component(.weekday, from: Date()) returns values from 1-7 but weekdaySymbols expects array indices.

调查 NSCalendar/DateComponents api 或编辑您的问题以使其更具体，如果您需要 DateComponents api 的帮助.

Investigate the NSCalendar/DateComponents api or edit your question to be more specific if you need help with the DateComponents api.